Sorry for the delay in replying.
What's the symptoms? Is air appearing in the rear wheel cylinders? Was the master cylinder replaced recently?
If a master cylinder was recently installed for a vehicle with four wheel disc brakes, it will be missing the residual check valve. That will allow air to seep past the lip seals in the rear wheel cylinders when barometric pressure goes up.
Caradiodoc
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Thursday, December 24th, 2009 AT 9:17 PM