Brake Master Cylinder Problems of GMC Sierra 1500 - part 1

2020 GMC sierra slt VIN:1gtu9ded5lz310106 15,700 miles. Braking system failure at about 45mph on highway 78 in loganville, GA aproching an intersection with red light, vehicle seemed to loose all power braking. I stood with all I could on the pedal, and turned to avoid rear ending stopped vehicles, running into middle of the intersection before it stopped; no accident ! dealer is replacing master cylinder and booster braking system, along with computer system ugrade. My concern is the dealership and NHTSA is aware of this issue, yet no cease and desist driving directive has been issued !.

See all problems of the 2020 GMC Sierra 1500 🔎.

Tl the contact owns a 2019 GMC Sierra 1500. While pulling out of the parking lot, the brake warning indicator illuminated. The vehicle was taken to mcdonald GMC Cadillac (5155 state st, saginaw, mi 48603, (989) 319-4136). The dealer tested the brakes, replaced the master cylinder, bled the brakes, performed a road test, and declared that the failure was remedied; however, the failure recurred during a road trip 200 miles away from home. During the failure, the brake pedal traveled all the way to the floorboard again and the warning indicator turned off. The contact managed to drive home slowly. The manufacturer was contacted and provided a case number. The manufacturer stated that a case manger would call back within two days. The failure mileage was 3,930.

See all problems of the 2019 GMC Sierra 1500 🔎.

While driving my truck approximately 45 mph on a street, I heard the vehicle notification alarm sound, I looked down at the dash and had several warning lights illuminated:I had four messages: service esc service trailer brake brake system failure - 62 mph top speed steering assist reduced drive with care lights on dash that were illuminated abs check engine brake traction control before I could read each warning light, a red stop light was approaching. I was at that time I pressed on the brakes and realized that my brakes were extremely spongey. I figured I only had about 10% braking power. With my two year old in the back seat, I pushed as hard as I could to stop my truck. Luckily, by the grace of god, I was able to stop my truck without rear ending the car in front of me. My truck was then towed to the dealership. I bought the truck 5 days prior. My truck has approximately 161 miles on it. The dealer told me the next day I needed a new master cylinder and hydro boost. Probably the absolute worse component to fail on the driver while the vehicle is in motion.

Very difficult to stop the truck while going at a low rate of speed 5 to 10 mph. Had to forcefully apply pressure to the brake pedal to get it to stop still required more stopping distance. Brakes did not become fully functional until after placing the vehicle in park and shutting the vehicle down waiting for approximately 15 minutes. Restarted the vehicle and brake were functioning properly. This event occured at approximately 46,000 miles on the vehicle. Following day brought the truck into the local GMC dealer and verified that the truck has a braking problem found a leaking brake booster and master cylinder.

See all problems of the 2015 GMC Sierra 1500 🔎.

Brakes completely failed. Replaced brakes on all 4 wheels, but to no avail. Then replaced the master cylinder and still no brakes. My fence pole and mailbox stopped my vehicle.

Drove my vehicle about 15 miles and parked it in a parking lot for about 10 minutes. When I returned and backed out of the parking space the brake pedal would not compress much at all unless I pushed on it with some body weight for leverage and only then the vehicle barely stopped - was travelling at a very low speed but still very hard to stop the vehicle. I tried to pump the brake pedal, then carefully moved the vehicle a couple of times to test the brakes and the condition repeated. I then parked the vehicle and shut off the engine momentarily. The condition persisted when I restarted the vehicle. I started to drive the vehicle slowly and carefully in a loop around the parking lot pumping the brakes a couple times and the pedal finally returned to normal. Had I been on the highway when this condition occurred or had I been towing our 5k-lb trailer the consequences could have been catastrophic. Reading online the issue appears common in gm trucks from 2014 up and the cause was often a failing vacuum pump. I located a copy of a service bulletin published internally by gm discussing the issue and prescribing a repair procedure. The bulletin noted that if engine oil escaped past the seal(s) of the failing vacuum pump replacement of the brake booster, master cylinder, and vacuum line may be required in addition to the pump. Given the appearance of this as a common issue, fear of losing brakes again, and fearing that waiting may necessitate other braking components under the hood needing replacement if the oil seeped through the pump, I promptly replaced the vacuum pump. Following the repair procedure prescribed in the gm bulletin there was no engine oil noted in the vacuum line so no further parts were replaced other than the pump and gasket. Condition has not repeated after replacing pump 1k miles ago. Vehicle had approx. 65k miles when this condition occurred.

See all problems of the 2014 GMC Sierra 1500 🔎.

I pulled into a parking spot and lost the ability to stop my truck. The brakes locked up and I couldn't push down on the brake pedal hard enough to get the truck to stop. I was going slow enough to use the curb in the spot for it to stop me from hitting anything. I had my car towed to a repair shop and they confirmed that the brake vacuum pump failed and had to be replaced along with the master cylinder and because the vacuum pump was the initial point of failure, the repair was not covered under my warranty.

Hard brake pedal - "no brakes" first occurrence in paring lot 2016 timeframe . Was backing into a spot that was slightly downhill, no brakes , vehicle hit curb and stopped. Pulled forward no brake, eventually they came back . Complained to gm hotline - they responded with questions and I told them I took truck to dealer, I believe dealer replaced master cylinder second occurrence may 2017 driving on I-75 - 18 year old daughter driving on way home from college, traffic slowed and she said "I have no brakes, pedal wont move". She maneuvered to side of road, vehicle turned off and then back on, brakes came back and worked ok . Mentioned during oil change at serra Chevrolet, but since brakes were working they would not investigate third event - November 16-- at tail end of 8 hour drive returning from deer camp. Exit freeway and in stop and go traffic , on a downhill portion of road, the brake went hard . Got vehicle stopped and turned engine off and back on, brakes released. Contacted dealer about bringing truck in this week. Going to ed rinke dealership today Nov 24, I read article about the a faulty brake vacuum pump. This now makes sense. Please get this issue fixed.

I have had problems with my brakes for the last 3 years. I already had by brakes fixed my gm because of a bad squeak when pressing on my brakes. I recently just changed my master cylinder because the brake pedal would get stuck on certain occasions when driving. Sometimes having me to use the emergency brakes. Sometimes I would have the brake pedal all the way down and the truck would still keep moving. It would happen sporadically. Most of the time when I am driving in traffic or through a parking lot.

Tl- the contact owns a 2015 GMC sierra. The contact stated upon getting a state inspection they failed due to master cylinder, vacuum pump, brake booster, and hose leak. The dealer was not contacted. The manufacturer was notified of the issue. The failure mileage was approximately 33,00. Kh.

During a normal stop at a stop sign on a rural road, a steel brake line ruptured due to excess corrosion. This one line between the master cylinder and abs module is the only line that provides pressure to the front brakes, which supply roughly 75% of the vehicle's braking power. The rupture resulted in rapid fluid loss and therefore a lack of pressure in the hydraulic system to allow for adequate braking. Needed to swerve into a ditch to avoid a crash with cross traffic. Visual inspection indicates most brake lines are extremely corroded, and were obviously made with substandard materials as compared to other manufacturers. I do recognize that this is an old vehicle, however other vehicles of similar age and driven in similar environments do not have this issue. Online research, most notably the complaints filed to NHTSA, indicate this is a common problem with chevy/GMC trucks of this era. Although other oem's (Subaru) have issued recalls in similar situations, it appears that the gm that the public bailed out just a few years ago has decided to deny that this is a problem, gambling that the the cost of lawsuits associated with deaths do not exceed the cost of a recall.

See all problems of the 2000 GMC Sierra 1500 🔎.

When I press on the brakes, it feels as though the master cylinder is gone and it is the manual type drum brakes that has air in the line. It takes everything I have to press them and pray it stops!! the vehicle is always in motion when detecting this problem and seems to occur more repeatedly if the brakes are pump quickly in succession before applying brakes or when the brakes are pressed for an extended amount of time then you release and repress it want stop. Another issue is my lane id warning. When turned on at the button, it just beeps at me and shows service light. When I first took it in with the problem, the dealership called me and said all fixed, but it did it before I left the parking lot. They had my truck all day for the issue, put me out of a vehicle and then said they would need for extended time to repair but didn't know there was problem. How do you make that determination when you told me its repaired. I just turned it off and haven't used in 2 years.

Brakes became hard to depress and engage while vehicle was moving. Almost crashed vehicle. Afraid to drive. Brought to dealer. Said it was bad brake booster. After doing some research, found out should replace vacume pump, master cylinder, hose line, etc. , so I did. 44k miles, 3 year old truck, happened on /12/10/17 brought to dealer garber GMC in florida for $1300 repair on 12/11/2017. No warning signs when this happened. Very dangerous when brakes fail while vehicle is in motion.

Tried to stop tuck when parking. Brakes were extremely hard and truck came to a slow stop while I was mashing the breaks with all my might. There was break fluid all around right front tire. Dealership found engine oil in vacuum line of vacuum pump due to valve stuck in pump causing hard brake pedal. Replaced vacuum pump, pipe, brake booster and master cylinder, fluid.

2014 GMC Sierra 1500 denali pick-up truck with 67,900 miles: experienced complete loss of power brakes in stop-n-go traffic situation on highway. Problem started as an rare issue that would correct itself and progressively got worse over a week's time. Issue occurred when in traffic requiring frequent stop-n-go braking. Brake pedal went completely to the floor and stopping distances dramatically increased. Had no way to manually apply the brakes to get them fully engaged. Ultimately forced to shift into neutral and apply parking brake to stop. Subsequently found gm bulletin #pit5361b referring to other customer problems with weak vacuum at brake booster. That problem was confirmed and diagnosed by my automotive professional. Ended up having to replace brake master cylinder, vacuum booster, vacuum pump, vacuum tube/pipe and 2 serpentine belts for a grand total of $1626. 00 in repair work (similar amount to the others I found who experienced this issue). Talked to my GMC dealer who confirmed that this is a recognized issue that hasn't yet risen to the level of a "safety recall". However, I was told "stay tuned" because they wouldn't be surprised if a recall on the power brake system was right around the corner.

Was stopped at stop light,with foot on the brake. Started rolling forward and had to press harder on the brake. When holding foot on brake pedal and in gear pedal slowly moves down to the floor. Took vehicle to dealer who was luckily close by. They tested truck brake's and found the same thing. They kept truck, and repaired the next day. Master cylinder was bad. They believe that a seal may have a crack,or a nick in it, allowing pressure to release. The dealer said more than likely gm will ask for part to examine it, so they can't take it apart. Truck had 3173 mile's on it.

See all problems of the 2017 GMC Sierra 1500 🔎.

1. Rusted brake lines blowout. Fortunately mine happened in a parking lot,not on the turnpike,and requiring an emergency stop. 2. Clutch master cylinder plastic mounting flange separates when clutch is depressed,disabeling std. Transmission. On residential street.

See all problems of the 2006 GMC Sierra 1500 🔎.

While driving in downtown city area, vehicle in motion, attempted to apply brakes and pedal went straight to floor almost causing an accident. There was no warning to loss of braking system. Vehicle was brought to residence and reviewed. Brake lines from master cylinder have suffered rust damage and caused a failure of the braking system. Upon further review all brake lines on vehicle are exhibiting extreme corrosion to a system that should not be rusting.

See all problems of the 2001 GMC Sierra 1500 🔎.

Pulling to a stop in my driveway my brakes slowed the truck and then completely gave way with the pedal hitting the floor. I stomped on the emergency brake pedal to keep from hitting the porch. I am so lucky to have that happen at low speed off the road. That could have been a tragedy on the highway. Turns out that my brake lines are severely rusted and one of the 2 lines coming off the master cylinder now has a pinhole leak immediately above the frame where it bends 90 degrees to go back to the abs manifold. Applying the brakes just squirts fluid out of the line. I thought a single failure was supposed to result in reduced braking power, not complete loss of brakes. Note that my truck is in otherwise great shape and I simply had no idea. It is clear that the NHTSA has been bamboozled by gm. Brake lines are a critical life safety system, installed on and in some places in the chassis before the vehicle body and bed are attached. It is not routine maintenance to rinse the brake lines let alone replace them. Gm pushing this back on the customer is complete bs. You can buy nylon coated or stainless steel brake lines for less than 100 $. The incremental cost to go from steel to something that would last the operational life of the vehicle is less than 50 $. I'm waiting on an estimate from my non-dealer shop, but a dealer charging 3600 $ is not surprising considering the amount of labor that must be involved. The NHTSA decision on the issue is unconscionable. Guess it might have been different if they had run over a child at a crosswalk or if their child was mowed down by corporate greed. Hopefully that never happens, but with so many rotting gm trucks on the road, we will have to keep our fingers crossed.

See all problems of the 2003 GMC Sierra 1500 🔎.

Tl-the contact owns a 2009 GMC Sierra 1500. The contact stated while driving approximately 65 mph, the abs and the service brake system warning light illuminated. The vehicle was taken to a dealer. The technician diagnosed that the master cylinder and the booster needed to be replaced. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 34,000. Pam.

See all problems of the 2009 GMC Sierra 1500 🔎.

Slowing for traffic light going downhill and brake pedal went to floor. Pumping did little so used parking break to stop. Cloud of white smoke out of tail pipe as engine shuttered and valves chattered. Front drivers side break line failed from external corrosion shooting fluid on hot exhaust manifold. When peddle went to floor master cylinder passed fluid into booster and through vaccum line into intake of engine causing white cloud of brake fluid burning with gas internally almost shutting motor down and loss of all power. Replaced corroded brake lines and master cylinder. Negligent design and materials quality in my opinion. Now both front calipers drag and shake steering wheel. Where is safety recall? brake lines are not a maintenance item! try replacing one as they were installed to never come off. Would Toyota have been given a pass on this issue for this many years of complaints, thousands of failures, injuries and deaths?.

See all problems of the 2005 GMC Sierra 1500 🔎.

Brake lines blew to master cylinder.

I have bought the truck used I have emailed GMC that I was having issue upon doing so they had sent me a phone number to call which I tried and it said it would not let me from my area I emailed them again and they did not reply. My master cylinder went out on my GMC Sierra 1500 wt extended cab and I found upon replacing the master that they used a 2006 master cylinder on what they call a 2007 vehicle . . Lost the brakes completely no wreck. What they did do was send me a letter in the mail stating my bumper to bumper warrenty was due to expire how convenient for them. I tried hard because I want to know did they use 06 on my 07 truck to obtain replacement parts it is important. Now a few months later I am noticing that undeneath the drivers side that one of the brake lines is starting to leak I still only have 48000 miles on this vehicle no way no how should the lines have rotted out this early or corroded Gmcs answer is it is out of warranty. Being on disablity I will have to come up with close to 300 dollars to replace all the lines before they blow out and cause me to have a major accident which GMC does not seem to care that they have installed defective parts that prematurely fail.

See all problems of the 2007 GMC Sierra 1500 🔎.

Recently, I spent three days performing preventive maintenance on my 2005 GMC sierra and found two primary issues that shouldn't be occurring on this young of a vehicle. The first was rotted sections of brake line (supposed to be stainless steel) in the rear of the vehicle (the main line that comes back from the master cylinder) and the second issue was a leaking seal in the power steering pump. There is a considerable number of people with the same problem who have qualified for a recall or work to be done under a technical bulletin, but apparently my VIN lies outside of the acceptable range.

Looked under my truck after my brakes failed while driving to work. Was surprised at how rusty all the lines are. Aaa towed my truck home. I spent the next 3 days replacing brake lines. Now I noticed the lines from the master cylinder are rusty as well. Now I will have to replace those as well. I've never had brake lines rust out like these have. My wife drives a little 1999 escort and the brake lines on that are fine. What the heck this is all the use you can expect on a GMC sierra?.

Driving in residential neighborhood at approx. 25 mph. Upon engaging brakes to stop at stop sign, pedal suddenly became extremely soft and travelled nearly to floor. It took me a moment to figure out what was going on and I had to press with full force to stop. Drove slowly to nearest GMC dealer, not far away. Almost all of the brake pedal travel provided no response; the remainder of travel was soft and provided minimal braking performance. Diagnosis by the dealer was excessive corrosion on all solid brake lines and fittings. Burst/leakage on a line near the driver's side rear wheel was causing the soft, nearly unresponsive brake pedal. Recommendation by dealer was to replace all solid brake lines and fittings, from master cylinder to abs unit to each wheel end. I was told that only fixing the area that had burst would be too "risky" due to condition of the rest of the solid brake lines and that failure in another part of the lines was "probably going to happen. " the flexible/rubber brake lines and fittings at calipers/drums were "ok" and not replaced. Total charge: $1380. 46. This is a 7-year old vehicle with about 40k mileage that has been well-maintained in personal use/commuting. I have never experienced this failure before, on any vehicle at any age, including numerous vehicles 10+ years old all driven in ne ohio. I am grateful the brakes gave up when/where they did: at low speed and without any other vehicle (or pedestrian) around. I contacted gm and registered my complaint; they offered no relief or explanation (beyond "environmental" cause), though they expressed serious interest in my experience. I think this failure is unacceptable at this stage of a vehicle service life, regardless of whether it is used in the "salt belt. " please consider expansion of ea11-001 to later model years of gmt800-series vehicles.

21 year old step-daughter drove my truck to work this afternoon, when she went to leave at the end of her shift, she stepped on the brake pedal to shift out of park, it went all the way to the floor. Thankfully she was still in her parking space, and not out in traffic on a very busy 6 lane road. I found at least one of the 2 brake lines from the master cylinder rusted completely through where they are clipped into the plastic guide on top of the frame.

Main brakeline from master cylinder to rear differential rusted through and leaked resulting in a no brake situation.

I was traveling close to my home and was making a left turn on a country road. I went to apply my brakes with no result. The peddle went all the way to the floor. I shifted the vehicle into low gear and finally made it home. I had to have the vehicle transported to a shop for repairs. The cost to fix the brakes lines, master cylinder - $1000. Not happy with GMC and will probably never buy another american made vehicle. I also have a chevy tahoe and I have had nothing but problems with that vehicle as well.

While bleeding the rear disk brake calipers in the driveway, the steel hydraulic tubing from the brake master cylinder to the rear brake calipers burst due to excessive rust. The result was a quick loss of hydraulic brake fluid. Had this happened on the highway, all braking would have been lost due to the fact that the hydraulic fluid reservoir is not divided into front/rear compartments. After the leak, the brake pedal went right to the floor.

A steel brake line was rusted and failed leaving limited braking for the vehicle. All fluid drained from the master cylinder.

Brakes failed as I was just leaving the front of my house , tow to garage $65. 00 installed all new brake lines from master cylinder to abs pump and from abs pump to each wheels flex line cost of $300. 49, hazardous materials$10. 00,labor $500. 00 .

See all problems of the 1999 GMC Sierra 1500 🔎.

The contact owns a 1997 GMC Sierra 1500. The contact stated that after engaging the brakes and coming to a complete stop, the vehicle lunged forward. The vehicle was taken to a local repair shop and they were unable to diagnose the failure. The contact stated that he replaced the hubs, rotors, calipers, and master cylinder as a temporary remedy, but the failure continued. The manufacturer was not made aware of the failure. The vehicle was not repaired. The failure mileage was 14,000 and current mileage was 38,000.

See all problems of the 1997 GMC Sierra 1500 🔎.

1st incident on or about November 2010 rear brake line failure no previous warning light indication - steel line burst causing brake failure along with emergency brake failed this happened at about 10 miles an hour so the vehicle was able to be stopped by a curb. Testing the brakes none worked even though it was a rear line failure. Vehicle towed and repaired by replacing the line from absbox to rear and the emergency brake shoes and rear disc pads were also replaced. Even with the emergency brake shoe replacement its ability to stop the truck was minimal at best 2nd incident on or about August 2011 the truck failed to pass nc state safety inspection as emergency brake would not hold - the emergency brake shoes and rear disc pads were replaced again with similar results with the previous replacement - with marginal emergency braking operation, but enough to pass the nc state inspection - also the backing plates of the rear brakes had to be replaced as they had rusted away 3rd incident on or about October 2011 front brake failure no previous warning light indication - steel line to front brakes burst where two of the lines were rubbing together where they cross over the frame from the abs box. This occurred at a stop sign. The hydraulic system maintained some stopping ability and that combined with the recently replaced emergency brake pads did stop the truck just slightly past the stop sign. To move the vehicle to a safe location it had no hydraulic stopping ability, but the emergency brake did function marginally at the very slow speed. The vehicle again needed to be towed. Due to the way the front four steel lines are run and bundled together with obvious other points where these lines rub together combined with rust will require all the front steel lines to be replaced including the steel lines from the master cylinder too the abs box.

Severe corrosion of the brake lines became apparent during a sudden application of the brakes which caused multiple brake lines to rupture and leave the vehicle with no brakes since a line from the master cylinder to the abs unit front left input and the abs to the rear t line blew simultaneously. When removing the damaged brake lines they literally crumbled to pieces due to corrosion. During the repair to the brake lines severe corrosion was noted on the fuel lines also.