Replaced power steering pump and this fixed the problem for several days. Now I've replaced the hydraulic booster and still have a hard pedal with little or no brakes
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.
SOURCE: 89 f250 7.3 diesel, brakes went very stiff, still
the problem is caused by either a failed power brake booster vacuum diaphram or a loss of vacuum to the booster, most likely the booster is defective, if this is a diesel then check the enginge driven vacuum pump.
SOURCE: I have a 2001 Dodge Ram 2500 5.9 Cummins Diesel No Brake Pedal
what it sounds like to me and I pretty much only work on cummins and powerstroke trucks. your problem seems that your calipers are worn and are not holding the pressure. and or the lines going to them have faded and caused them to ballon or stretch. if the pedal is vary hard to puch hydraboost and worn parts but if the pedal isnt hard then your hydrabosst should be fine as i said most likley your rubber brake lines in front and worn calipers
SOURCE: K3500 hydraulic brake booster engages brakes when
hello there:
You will need to replace the brake booster to correct the problem in order to do this you will need to remove the push rod from you're brake arm separate the master cylinder from the booster and remove the four bolts on the booster and slide it out install in reverse hope this help you out sincerely D.Jones
SOURCE: I have a '97 F250 diesel with about 180K. The
Make sure the calipers are not locked down on the rotors.
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