How do you test for a leaking brake booster? 1975 Barth 454 chebby p-30

quote:

Originally posted by Mary Ray:
How do you test for a leaking brake booster?

Are we talking about vacuum loss or are we talking about hydraulic psi loss?

Would you please tell us the symptoms so that we can better answer this question. No detail is too small when you're talking about the brakes.

Had a leaking front caliper-had it rebuilt by ABC Brakes-replaced it and bled that caliper only, can't get the pedal firm. It still has brakes but pedal is down compared to before. It sounds like I can hear air escaping when depressing the pedal.

Mary, what length is your coach? does it have disk or drum brakes on the rear? What size are your wheels?

Sorry, but there are two types of power brake units on P30s, depending on GVW.

quote:

Originally posted by Mary Ray:
Had a leaking front caliper-had it rebuilt by ABC Brakes-replaced it and bled that caliper only, can't get the pedal firm.

Bleed the other caliper on the front axle. Heck, bleed them all out. How low did the fluid get? You still might have an air pocket.

Do you have a hydraulic booster or a vacuum booster?

Fluid did not get low enough to suck air. Don't know which booster I have, never looked for it (yet) Will bleed all the others and go from there. Thank you ever so much, couldn't afford this thing if it weren't for all the free help that we all receive.