1983 Buick Regal Repair Question
There is an updated backing plate to replace that trouble-prone design that you still have. It requires the use of a normal bolt-on wheel cylinder. Be sure to check the diameter printed on the lip seals so you get the correct size.
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If the lock ring is not biting, you likely don't have it fully installed. That clip can be very difficult to lock in. I usually wedge something steel between the wheel cylinder and the wheel hub to hold it tight against the backing plate while using a punch and hammer in the rear to get it locked in.
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