Originally posted by B Breon:
If I remember correctly you do the following: With the car running pump the brakes 4-5 times and hold. Turn the car off, if the pedal drops, the booster is working. With the car off, pump the breaks 4-5 times and hold. If the pedal drops, the mastercylinder has a leak or you have a leak somewhere in the system.
I think its just the opposite, keep pumping the brake pedal and if it goes hard, the brake booster is good.

The rear drum adjustment makes a big difference.

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