Rick's Free Auto Repair Advice

Low brake pedal GM

Fix a Low brake pedal GM – C027B GM vehicles

If you encounter a low brake pedal or one that sinks to the floor and you’ve either done a repair or had a repair done lately where the master cylinder has been moved, the problem may be as simple as a missing O-ring. GM installs an O-ring between the vacuum booster and the master cylinder. But if you remove the master cylinder without first pumping the brake pedal several times to discharge the stored vacuum, that can dislodge the O-ring. Replace the O-ring and the problem should disappear

The O-ring issue affects the following vehicles:

2009-12 Chevy Colorado and GMC Canyon
2009-13 Cadillac CTS & SRX, Chevy Corvette, Impala, Malibu, Traverse, GMC
Acadia
2010-12 Buick LaCrosse
2010-13 Chevy Camaro & Equinox, GMC Terrain
2011-13 Buick Regal and Chevy Cruze
2012 Chevy Captiva Sport
2012-13 Buick Verano and Chevy Sonic
2013 Cadillac ATS & XTS, Chevy Spark

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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