Thread: Dual 7" Servo
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Old 1st May 2012, 08:06
mashtun mashtun is offline
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Quote:
Originally Posted by peterux View Post
With vacuum applied to the servo from the engine running, the servo input actuator does not fully return to its rest position until I turn off the engine and pump the pedal few times or pull it back. It's as if the vacuum is somehow holding the brakes applied until I pull it back manually or the input spindle is sticking? With the engine off, the pedal returns fully.
It would be interesting to know if that's the same as others see. Might indicate a faulty servo unit if not?

Quote:
Originally Posted by peterux View Post
I may be the only one with drum brakes but again, I can't think how this would cause this effect, except that my front brakes do seem OK so maybe this is the clue?
Maybe you need a pressure reducing valve for the rear brakes? Mind you, I don't think those do anything when the pedal's not pressed...

Quote:
Originally Posted by peterux View Post
Anybody else got any ideas?
Is it possible to have too much vacuum? What would the effects be if so? I've seen minimum but not maximum vacuum levels quoted. Is there any manual adjustment possible on the rest position of the rear brake shoes?

Mark.
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