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You have a rusty brake caliper. The piston is probably so rusted that its so tight for the piston to retract everytime you release the brake pedal. The only remedy for that problem is to buy a new or rebuilt caliper and replace the defective one...........You might want to consider replacing both....

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18y ago
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Q: What caused the right front brake to lock on a 91 Toyota 4 runner?
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