Posted by Steve@Advance on March 03, 2015 at 20:10:59 from (107.203.134.67):
In Reply to: Re: ford truck brakes posted by High Octane on March 03, 2015 at 16:07:05:
Need to do some diagnostics... Since it is heat related, the problem is likely brake fluid expanding and not able to return to the reservoir.
Gather the tools needed to open the bleeder screws and to crack the lines at the master cylinder.
Drive it until the problem occurs.
Crack the lines at the master cylinder, see if the pressure relieves. If it does, the problem is in the master cylinder. It could also be in the booster or linkage, not allowing the cylinder to fully return.
If the pressure does not relieve at the master cylinder, go to the suspected wheel, open the bleeder screw, see if the pressure relieves. If so the problem is the flex hose to that wheel or axle.
If no pressure is found, and the brake is still binding, the piston(s) are stuck in the caliper.
One thing that worries me, the overfilled master cylinder. (BTW, the overfill will not cause pressure to build, it will overflow or blow the lid first.) But, how did it get overfilled? And what was it overfilled with? Is it possible oil could have been put in the master cylinder? One of the symptoms of oil contamination is heat related pressure build up, because the seals swell and the master cylinder can't return. If any rubber parts are swollen, there is oil in the system. Bad news! Very difficult to clean out, replacing components without cleaning it out will only be a waste of parts!
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