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02-19-2011 03:43 AM #1
Sticky brakes and boosters mystery
As long as we're on the subject, there's an odd situation popping up where the brakes are sticking after rebuilding the booster. A couple guys have reported this recently. Problem is that it makes no sense mechanically; the rebuild is simply a replacement of o-rings and seals, and nothing fundamental changes. Even odder is that both guys reported what sounded like ABS activation before the brakes jammed.
Already considered and probably eliminated:
The brake pedal linkage adjustment; it has to be kept short enough that the booster piston fully retracts with the pedal up.
Activator rod reversed- The link rod between the two cylinders must have the end with the shorter tip and the beveled shoulders inserted into the booster. Backwards might (but just maybe) push the primary piston of the master cylinder in a couple mm at rest.
It's a head scratcher; ideas welcome.
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