Hi i am a new aussie to this forum i need help with a 1977 f350 brakes i have replaced the boster master cylinder frount disks and still got bad brakes you can push as hard as you can and wont skid the wheels anyone got any suggestions i was going to replace the proportioning valve next any one know where to get one in australia cheers john

 

Are teh lines being crimped anywhere? are they original lines? you may be losing pressure somewhere. I had a similar problem on my truck last week.

Replaced both front rotors and pads in August adn brakes were fine for awhile. Then front right caliper locked up so I replaced it. Lately the truck has been pulling to the right upon braking and ONLY the right side would lock up when I slammed on them (ABS fuse out). I replaced the front left caliper and it resolved the issue. I'm not sure why or how, but it may have been leaking or losing pressure or something.

This is just my situation, but calipers are cheap (here at least) so you may want to consider it

 

Hi kevin The 1977 f350 is orignal stock 302c front disks pads are new no brake fluid leaks and brake pedal does not fade. cheers john

 

yeah my pedal didn't fade and stayed stiff with no leaks or signs of a leak, but that side just didn't lock up no matter how hard I tried.

That's a real good lookin' 77 there. Around here once a truck gets to be 5 or 6 years old you'll probably be battling rust rust and more rust