MORE THAN LIKELY THE RUBBER HOSE HAS SOMETHING IN IT. REPLACE THE HOSE SHOULD BE AS GOOD AS NEW.
There are four. One at each wheel. Look behind each wheel and you will see the calipers on the front wheels, and you will see either calipers or a backing plate on the rear. On each caliper there will be a bleeder screw at the top, and if you have backing plates on the rear wheels, there will be a bleeder screw sticking out just above the center.
On the brake calipers.
Bleeder screw for clutch is at the slave cylinder, on the bell housing of the Transmission. The bleeder for the brakes is on the calipers, and on the backing plate of the rear drum brakes
most common- one of the brake hoses need to be replaced. here is how to check raise and support the truck then remove the wheel where the brake is sticking. pump the brake pedal 2 or 3 times. locate and loosen the bleeder screw on the brake caliper if fluid pressure is trapped the hose needs to be replace (recommend replacing both) if no fluid squirts out the caliper needs to be replaced (again recommend replacing them in pairs.
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Brake? On calipers & behind backing plates on drums.
Either the caliper piston is frozen stuck or the hydraulic brake hose has collapsed internally. Open the bleeder on that caliper and see if the pressure releases, if it does you have a bad brake hose.
If you open the bleeder and it releases pressure, follow the steel line back to see if it is pinched somewhere.
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unscrew the bleeder screw
When there is to much resistance to retract the piston, When the rubber piston(s) boot/seal is damaged/torn, When the bleeder is broken/stripped,
The next time the brakes are stuck engaged, try opening a bleeder in one of the calipers to see if the pressure releases or not. If the pressure releases I would suspect a faulty master cylinder. If only one caliper is stuck, it could be a collapsed brake hose, stuck slider pins or a stuck caliper piston.