why does my 02 cobalt rev up when I apply heavy braking?

Asked by Mar 22, 2016 at 01:43 PM about the 2005 Chevrolet Cobalt

Question type: Maintenance & Repair

if I app;y harder than normal braking at a stop sign, it revs up to about 3000 for
a couple seconds

1 Answer

92,605

Could be early warning of a brake booster failure. Try just sitting still with the car in park, engine running and start mashing down on the brake pedal and watch the engine RPM's if they start to rise then there is a leak in the booster system, could be a hose, check valve or the brake booster assembly itself.

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