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My sons ’00 civic ex coupe no ABS has a hard brake pedal most of the time now . I checked the vacuum hose with the check valve in it and it seems to be working correctly. I did test the booster as per the service manual and booster seams fine except for the hard brake pedal . After the car is driven you will occasionally get a normal brake pedal and brake operation, but it is sperratic and short lived. Is this a bad brake booster? no fluid leaks any where on the brake system, also brake light is on constantly. Any ideas.???
Ed
- Replies
Disconnect the vacuum line going to the booster and check to ensure it has vacuum…. If you can’t feel a difference in brakes between when disconnected and connected (with engine running) chances are something is wrong with your Brake booster…
-Karl
http://www.mpbrakes.com/techtalk/how-to-series/how-to-diagnosing-a-hard-brake-pedal
It may be as simple as low vacuum level from the engine. That = low compression. Not tight piston rings. Then engine does not develop enough suction to booster.
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