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Possible Brake Booster Problem?? 700 1988

posted by  pawdrip on  Sun Sep 14 03:49 CST 2003
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Hi, I tracking a soft pedal problem. I have replaced the master cylinder an bled the brake lines and still have a low pedal. I checked the vac hose and check valve and they seem fine. I pumped the brake to drain vac, started the car, and pushed pedal to floor, when I turn the car off and let off the pedal it comes right up and I hear air escaping. Is this the booster or a vac line in the car or what? Can anyone help. Thanks








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    Possible Brake Booster Problem?? 700 1988

    uid 5008's pic
    posted by  Colin UK on  Sun Sep 14 05:17 CST 2003
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    A faulty booster will give a hard pedal due to lack of assistance.
    There is a solid rod through the centre of the booster connecting the pedal to the master cyl.
    Even if the booster is faulty it cannot cause a low pedal.
    My guess is that you have not got all the air out of the system, you may need to pressure bleed the system.
    Another , but rare, possibility is a flexible brake hose ballooning under pressure.
    Colin.







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