Trouble bleeding the brakes after a brake upgrade.. (Page 3/3)
Mike in Sydney MAY 16, 04:03 AM
Do the brakes stay on after you press the pedal down? If he brakes stay on, it could be the brake booster is assisting when it shouldn't. To verify this, you could disconnect the vacuum pipe that goes to the booster to see if the pedal the raises. If the pedal returns to normal position after the engine has been turned off for a while, that points to a booster issue

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Mike in Sydney

Threedog MAY 16, 04:58 PM

quote
Originally posted by Mike in Sydney:

Do the brakes stay on after you press the pedal down? If he brakes stay on, it could be the brake booster is assisting when it shouldn't. To verify this, you could disconnect the vacuum pipe that goes to the booster to see if the pedal the raises. If the pedal returns to normal position after the engine has been turned off for a while, that points to a booster issue




This is exactly what it is. The shop that bled the brakes actually said that the booster is working "too well" and not allowing the return spring to operate. The booster an S10 booster from summit and brand new..the master and one caliper was bad as well, I can't imagine I got THAT many bad new parts..

I ordered a new vacuum pressure regulator to see if that fixes the issue. Anything else that could cause it?
Mike in Sydney MAY 17, 04:37 AM
By pressure regulator, do you mean the vacuum booster check valve? It's rarely checked but should be (IMO) replaced regularly, especially when the booster is replaced. It's not too expensive.

Good luck. Hope you get it fixed.