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post #11 of 11 (permalink) Old 07-03-17, 02:40 PM
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re: Brakes locked up 1994 ford ranger

Found this in regard to booster problems on that vehicle .

" 1994 Ranger should have two brake lines out of the Master Cylinder one for the front and one for the rear so Proportioning Valve is in the master.

The front brakes get 70% of the brake pressure, the rear 30%

If you have replaced the caliper' flexible brake lines then the only thing left is a bad Power Booster.
Inside the cab on the power booster is an "atmosphere valve", when you apply pressure to brake pedal this valve opens and lets the 15psi of air pressure in which "boosts" your foot pressure since power booster has -15psi pressure created by engine vacuum.
There is also a spring inside the power booster to return valve and push rod to "normal" position when your foot is off the brake.
Valve or springs can fail which won't let master release pressure to brakes, you feel it more on the front because or the 70/30 proportioning.

To test this, after front brakes are locked or dragging shut off engine slightly push down on brake pedal 5 times, this will remove the vacuum on the power booster, or just remove the power booster's hose and check valve, have to take out the check valve or vacuum won't be released.
See if brakes are released now, if so replace power booster. "

and another test you can do ,

You can also try driving until they start to bind and unbolt / loosen the master cyl. from the booster. if they free up its the booster pushing on the master cyl.

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