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After brake rebuild, good pedal when car is off, but pedal disappears when car is started 200

uid 18083's pic
posted by  lucid on  Wed Jun 30 01:11 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
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It's normal for the pedal to sink about 1/2" when the engine starts and the booster gets vacuum. I can't explain why but know it happens (see Bentley 520-5, Booster Quick Check). There's a lot more system pressure than you can apply at the pedal.

I think the problem is in the bleeding. Give us some details.

When everything is new, I think it helps to apply full pedal pressure occasionally during each piston's bleed cycle to take up all the rotor-pad-grease-shim-piston clearances. If you don't do it, the booster will — accumulating a bit more pedal travel at each of the 6 pistons.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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New After brake rebuild, good pedal when car is off, but pedal disappears when car is started [200]
posted by  montysano  on Tue Jun 29 16:44 CST 2010 >


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