Four problems related to brake master cylinder have been reported for the 1999 GMC Sierra 1500. The most recently reported issues are listed below.
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 .
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.
The contact owns a 1999 GMC Sierra 1500. While driving approximately 45 mph the contact applied the brakes and the left front and right rear wheel exploded. He stated that the brake pedal extended to the floor. He carefully drove the vehicle to his residence. The vehicle was towed to the mechanic where it was purchased. The mechanic replaced the both brake lines to the master cylinder and the abs unit. The failure mileage was 79,686 and the current mileage was 80,058. Updated 08/27/10. Updated 08/30/jb.
1999 GMC Sierra 1500 5. 3 - I had brake lines fail on 3 separate occasions. First was a hard line to the front drivers side, happened in my driveway so no crash. Second was a line coming from the master cylinder. This was while towing a trailer and the trailer brakes managed to get us stopped even though we were on a hill. The third failure was stopping at a light, luckily no one was in front of me and I had plenty of stopping distance. After that I replaced all of the remaining lines on the truck. No problems since.