Brake Master Cylinder Problems of Chevrolet Express

My employer has three on a lease with bad master cylinder rear section proportioning valve not allowing cold driving rear brakes unless pumping brake pedal hard.

See all problems of the 2017 Chevrolet Express 🔎.

I manage a fleet of 53 school buses, model years ranging from 2008 to 2015. I have noticed a trend with the hydro boosters and master cylinders, they tend to leak internally on these gm vehicles some have begun to leak as early as 30,000 miles. I expect to have to replace all of these components, on every bus in the near future. As the fleet ages the trend is getting increasingly worse. I believe this is a dangerous situation because I am vigilant with keeping up on this issue, however I am not sure that the general public will have the same understanding about the danger of this design flaw. I have had buses come in bleeding brake fluid or hydraulic fluid.

See all problems of the 2012 Chevrolet Express 🔎.

Consumer stated vehicle will not make a short panic stop at low speeds, extreme pedal pressure has little effect as the vehicle approaches 15 to 10 mph and slower, consumer stated the abs control is suppose to drop off and permit the brakes to stop the vehicle without limitation, consumer was informed by dealer he should allow for greater stopping distance with abs and that the problem could not be duplicated, also consumer discovered brake fluid under the master cylinder, the dealer replaced the cap seal due to it not sealing properly.

See all problems of the 1997 Chevrolet Express 🔎.

2002 Chevrolet conversion van Express 1500 had a problem with the drivers side window. Express window would go down but not go back up. The motor was replaced three times, finally the switch was replaced. The brakes and master cylinder had to be replaced. The consumer was told the brakes were insufficient for the weight of the vehicle. The michelin tires only lasted 24,000 miles.

See all problems of the 2002 Chevrolet Express 🔎.