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. If you go start the vehicle and never touch the brake pedal, do the brakes lock up? I assume they do not. So does that mean they are applying and not releasing the first time you are pressing the pedal?
If this is the case, are you sure it is all four wheels? Let's lift the vehicle and make sure it is all the wheels and if not which ones are not releasing?
https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely
I am thinking this is one of two issues depending on these questions. First if it is all the wheels then the issue has to be something that affects all the tires which would be the master cylinder.
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
If it is just one or two wheels then I suspect we have an issue with the rubber brake line that is swelling and not allowing the caliper to release.
Let us know what you find with this and we can go from there. Thanks
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Sunday, February 14th, 2021 AT 4:27 PM
