rear brakes are locked up after I press and release brake?

1994 MERCURY SABLE
140,000 MILES • 3.8L • V6 • FWD • AUTOMATIC
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NJB1979
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My rear disc brakes on my 1994 Mercury Sable lock up after I press and release brake pedal. They will slowly let go and can spin wheel again. I have replaced lines, and master cylinder and bled the brakes. Any clues?
Jan 21, 2015 at 4:14 PM
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CARADIODOC
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Which lines are you referring to? Did the problem continue occurring right after you replaced the master cylinder, or did the brakes release properly for a few days?
Jan 21, 2015 at 5:20 PM
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STRAILER
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This happens when the brake master cylinder is going out and not returning fully which holds the brake on. Please go over this guide.

https://www.2carpros.com/articles/a-comprehensive-guide-to-fixing-automotive-brakes-locking-up

Please go over this guide and get back to us.
Oct 7, 2024 at 6:52 PM
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