Its not an air bubble. That would cause a low pedal and the brakes would not lock up. More than likely the brake hose is at fault. They can collapse overtime which allows high pressure fluid into the caliber but will block the flow of brake fluid back to the master. This results in a locked up caliper.
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Hello Terence, If only one caliper is locked up, it is not the cause of your master cylinder. You could have a bubble in a flexible brake hose not allowing brake fluid to return to the master cylinder from the wheel that is locked up. Another cause could be a stuck proportioning valve not allowing the brake fluid to return to the master cylinder .
Its not an air bubble. That would cause a low pedal and the brakes would not lock up. More than likely the brake hose is at fault. They can collapse overtime which allows high pressure fluid into the caliber but will block the flow of brake fluid back to the master. This results in a locked up caliper.
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When you are done with a brake job it is always important to make sure you can slide the caliper both inward and outward by hand to ensure that there is no sticking, (that is with the pads in place and caliper piston completely depressed into the caliper) it is not rare to find that a piston that is very hard to depress back in the caliper is due to deterioration of the inner lining of the brake hose, if you have problems pushing the piston back into place most likely this is your problem. I have strong hands and is most vehicles I can push the piston back into the caliper by hand.
SOURCE: dodge 1500 ram van, 5.2 Eng. left, front brake
Possible warped rotor. Have you tested for this?
If too far gone, they sell 'em reconditioned.
If not too far gone, you can have rotor "turned" on special lathe (recut) to flat and parallel so it won't bind.
If perhaps rotor has been turned too much, caliper may not permit pistons to retract. Try installing a shim thicker than the rotor and see if it retracts.
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