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The reason for all four-brake locking up is the master cylinder or brake booster needs to be replaced because it is not releasing the pressure inside the brake master. Please go over this guide to help and I have included how to change out the master and brake booster so you can fix the problem.
To be sure this is the problem you can loosen the brake master cylinder mounting bolts three turns to see if the brakes release. You might want to try to adjust the booster pushrod inward.
Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:
https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder
and
https://youtu.be/WDxvEQrMkBg
Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Tuesday, August 1st, 2023 AT 1:15 PM