Rear Brake Drag 3/16/2016 - Jeep Garage - Jeep Forum

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Old 03-16-2016, 12:02 PM
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Rear Brake Drag 3/16/2016

I have been chasing a real deamon in the brake system. The booster was going out in December so i had the shop replace the master at the same time. Since then both the rear brakes drag and heat up past 300 at freeway speed. The shop insists that if the shaft into the master were the wrong size the fronts would drag first, not the rears. I have replaced all brake lines calipers and rotors. i have completely removed the parking brake components. My thought is that the master is faulty off the shelf, or the ABS is fouled the solenoid that controls the rears. The ABS is not throwing a code however and the brakes still drag if i remove the fuse. I am going to try bleeding the system to replace the overheated fluid to see if that helps. i am at a loss....

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Old 03-17-2016, 08:28 AM
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Re: Rear Brake Drag 3/16/2016

I also agree on the master cylinder being the problem. There was no drag before changing the master cylinder and no ABS faults are present.
I think that you can check if the problem is with the master cylinder doing the following: apply the brakes and release them. Now loosen the hydraulic line from the rear brakes on the master cylinder a bit and catch the fluid. A little bit of fluid can come out, but there should be no pressure on it. If it holds pressure there, then only the master cylinder can keep it there.
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