This happens when the brake booster push rod is adjusted out too far which does no allow the brake master to return fully holding the brakes on. To confirm the issue loosen the brake master mounting bolts 3 turns to see if the car starts to roll again, if so remove the master and adjust the booster push rod inward. Also a brake flex hose can come apart internally causing a short of check valve in the system but this is usually isolated to one brake either front or rear.
Check to see if the caliper is releasing. If not, make sure the rubber brake hose to the caliper isn't collapsed inside and check the caliper to make sure there is nothing wrong with it.
To do this, lift the vehicle and safely support it. Spin the tire to see if it is free. If it is, then hit the brakes. When you remove your foot from the brakes, it should spin again. If it doesn't, open the bleeder to see if that releases pressure to the brakes. If it does, chances are the rubber brake hose is bad. They collapse inside and allow pressure to go one way (to apply brakes) but when you release the brakes, there isn't enough pressure for the fluid to return. As a result, the brake sticks. The caliper itself can be bad too. If opening the bleeder doesn't help, then the problem lies in the caliper.
Let me know if this makes sense to you.
Joe
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Monday, March 29th, 2021 AT 11:11 AM
