When I apply the brakes on my 86 Century; there is a very rough vibration in the rear brakes. It is at 2x wheel speed. On any sort of wet road, the right-rear wheel will lock and slide at low speed. The car has conventional drum brakes on rear.
First I thought it was a wheel cylinder that had leaked brake fluid on the shoe pads, so I replaced the wheel cylinder and shoes. There was a SLIGHT seepage on the cylinder. The problem was fixed temporarily but gradually re-occured over about 5000 miles. This time all components were dry. I replaced both drums and the problem went away, temporarily.
Now, it is back again! About another 5000 miles have passed. I have isolated the rear brakes by capping the fluid lines to the rear and test-driving the car. With only the front brakes working, the car stops straight and vibration-free. With only the right-rear capped, the car pulls left and stops vibration free.
It looks like the drum on this right-rear brake is warped AGAIN. What could be causing this? The automatic slack adjuster is working on both rear brakes. The shoes have mostly full pad (afterall they ahve been changed so many times!!).
Why the right-rear, repeatedly? I've had this car 13 years and never had this before. I've got another set of drums to put on after Christmas celebration tomorrow.
Thanks,
David
First I thought it was a wheel cylinder that had leaked brake fluid on the shoe pads, so I replaced the wheel cylinder and shoes. There was a SLIGHT seepage on the cylinder. The problem was fixed temporarily but gradually re-occured over about 5000 miles. This time all components were dry. I replaced both drums and the problem went away, temporarily.
Now, it is back again! About another 5000 miles have passed. I have isolated the rear brakes by capping the fluid lines to the rear and test-driving the car. With only the front brakes working, the car stops straight and vibration-free. With only the right-rear capped, the car pulls left and stops vibration free.
It looks like the drum on this right-rear brake is warped AGAIN. What could be causing this? The automatic slack adjuster is working on both rear brakes. The shoes have mostly full pad (afterall they ahve been changed so many times!!).
Why the right-rear, repeatedly? I've had this car 13 years and never had this before. I've got another set of drums to put on after Christmas celebration tomorrow.
Thanks,
David
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