James Duff Power Brake Problems

[Ghost Pony]

I'm getting a hard pedal on start up and when I pump the brake. Any ideas? Does the booster have an internal check valve that could have failed?

Also, can I get a replacement from a local parts house? If so, for what vehicle?

 

[shamu]

try this. mash down on your brake pedal and THEN start your bronco. if the pedal goes up then the booster is good. that is a good starting point. if you think the vavle is bad contact the said vendor to find a replacement sourse.
other issues if you have disc up front is that the calipers are worn out and locked up.
like always NEXT