Question about 1992 Ford F350

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Brakes wont release

We just replaced the hydro brake booster on our 1998 dodge diesel but the brakes still wont release from the rotor. Why

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  • Jim Goldsmith
    Jim Goldsmith May 11, 2010

    Do you mean that you want to back off the brake pads? so that you can remove the caliper?
    If so you need to use a large c-clamp on the caliper to force the caliper pistons into their bores to free up the caliper so you can remove the brake pads

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  • Master
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Was the leading input shaft adjusted correctly? Usually they come with a new one and has to be matched in length to your old one. If the old one was used I would bleed the system from the right rear, left rear, right front, & left front in that order. Always bleed from the furthest point first. Sometimes air in the lines will lock these up

Posted on May 24, 2009

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2002 Dodge Ram 2500 4X4, all 4 brakes locked up.


that's odd ,try disconnecting the vacuum hose at the booster chamber and see if they release,had a truck do that once,the master cyl.seal at the booster failed and the brakes were applied.

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2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

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yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

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Sounds like the calipers are not fully disengaging. Re-inspect the brakes, make sure everything is clean, then check to make sure the calipers back off when the brake is released.They wont be loose but the rotor should turn freely. Did you replace the rotors or have them turned?

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When you installed new calipers, did you bleed the lines out? Air trapped in the system can cause sticking. Unless they were sticking before you replaced all the parts. Try unplugging the ABS controller under the hood. If that does not work and there is no air in the lines then it would be 1 of 2 things.

1. Master cylinder failing to return.
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Start the car. let it run for 10 seconds. while its running pump the brakes. let the brakes go and shut off the car. now press the peddle til it gets stiff. Now hold it down firmly. If the peddle pressure fades, replace the booster.

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They need to be bleed again all four wheels but your vacuum pump may be bad since diesels don't have vacuum then have to have a pump, check that the booster one way check valve is good if you can blow thew it both ways it's bad, to bleed start from the wheel farthest away from the master cylinder pump the brakes 5 times and hold down then open the bleed valve keep doing this until you get clear fluid out of each wheel once you have done that if it is still mushy and you know you have vacuum re bleed with engine running this will help push more out with power assist. most like the hard brake pedal had to do with no vacuum check out the pump. You may also have to reset the 2 way check valve if you need help with this let me know.

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