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What causes a brake calipers to close but not open?

Answer:

Can be several things:

rust on the pistons preventing them from retracting
rust on sliding pins locking the halves of the caliper together
an internally damaged brake hose acting like a one-way valve and not releasing pressure

First answer by Dabac. Last edit by Dabac. Contributor trust: 486 [recommend contributor ]. Question popularity: 78 [recommend question].

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