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Old 03-07-2013, 01:03 AM   #4
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Ssicarman's Avatar
Join Date: Jul 2002
Location: Canada
Posts: 4,706

Why did you change the master cylinder?

Air in the hydraulic system will give a spongy pedal. Air has a hard time compressing like a fluid. Given this it is very unlikely that it will expand with heat to give you a hard pedal.

Dragging brakes mean that you have something holding hydraulic pressure on the system. If it began with the master cylinder replacement then this is where you need to start looking for your cause. I would unbolt the master and pull it back from the booster to make sure that the push rod is in place properly. If that is ok then you may have a problem in the booster.

With an intermitant problem you may have a time finding the problem.
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