Hard brake pedal
Break booster have a no return valve it is on the booster and there is a hoss from the valve to the intake
1- check the valve
2- check the vacuum hoss
3- clean the hole in the intake ( we're is the hoss engine side)
SOURCE: 1989 ford thunderbird standard brake system has hard pedal
You are correct in the assumption that the power assist is the problem. The brake booster has either failed completely or has a broken vacuum line. Please check that the booster lines are intact and if so, get yourself a new booster.
SOURCE: 2002 ford f350 deisel brakes pedal feels hard and
You should have a hydraulic brake booster. a common failure item on fords and also would cause your symptom. the burning smell, I would go back and recheck all the brakes. Maybe a problem with the e-brakes, or an issue with the front or rear calipers. Possibly a damaged steel or high pressure brake line. Good luck.
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: Suddenly my brakes get really hard, not that often.
Check servo is working correctly.Make sure you are getting a good suction from the valve.Remove the valve and try ****
ing
with your mouth if you can then change the valve
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