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Diagnosing a brake booster is a straight forward procedure. With the engine off, pump the brake pedal four or five times to bleed the vacuum out of the booster. Then with foot pressure on the brake pedal, start the engine. If the pedal drops, the booster is good.
If you haven't done this, try gavity bleeding your brakes. Sometimes having someone pump the pedal to bleed brakes agrivates the problem. To gravity bleed brakes, remove the master cylinder cap and make sure its full. Then open the bleeder on the right rear and let the fluid drip. After the rr move the the left rear and then the rf followed by the lf.
Good luck
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