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my front brakes wont disengage, they build up pressure and

Customer Question
my front brakes won't disengage...
my front brakes won't disengage, they build up pressure and allow the vehicle to stop but don't let up. I just swapped frames along with everything else and this is my only problem, a big one. The build up of pressure doesn't happen right away, I can drive it for about 5 miles in the city but after awhile of braking, the pressure builds up and the brakes stop the truck. It's a 2003 toyota tacoma.
Submitted: 8 years ago.Category: Toyota
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Answered in 3 minutes by:
11/25/2009
Toyota Mechanic: Skyvisions, ASE Certified Technician replied 8 years ago
Skyvisions
Skyvisions, ASE Certified Technician
Category: Toyota
Satisfied Customers: 14,541
Experience: Toyota Master Diagnostic
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When the brakes are locked up and the vehicle is hard to move if you crack the the lines loose at the master cylinder a quarter turn then tighten them backup does the brake pressure release on the front brakes?

 

Skyvisions

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Customer reply replied 8 years ago

I cracked the lines loose at the caliper, like I was bleeding them and that works. Should I try it at the master cylinder. It's odd, I bleed the brakes at the caliper, it lets the pressure off, but then will eventually build back up.

Toyota Mechanic: Skyvisions, ASE Certified Technician replied 8 years ago

You have one of two options either the load sensing proportioning valve in the back is stuck or the lines are hooked up wrong or the check valve in the master cylinder is not releasing the fluid pressure. Because all of these things were fooled with in order to replace the frame only your going to be able to make that determination.

 

Skyvisions

Skyvisions
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