chambers do not compress brakes to drum
2007-06-08 12:59:54 · 4 answers · asked by richey t 1 in Cars & Transportation ➔ Maintenance & Repairs
You know air pressure is released to apply the brakes look for a clogged vent filter at the brake pedal vent valve or something stopping the air from being released. pressure has to come up to move and that red knob emergecy brake just releases all the air all the chambers lever the brake cams turn and shoes hit the drums. Semi tractor trailer brakes are very simple that is why they can stop 75,000 lbs from 70 mph so fast.
2007-06-08 13:15:56 · answer #1 · answered by John Paul 7 · 0⤊ 0⤋
Apply brakes amd check to see that the angle between your chamber rod clevise and the slack adjuster is not less than 90 degrees ,,,
make sure your brakes are released before you attempt to adjust them ,,,
also check your cutout pressure on your d2 govenor ,,
60 psi should release your brakes ,, but it should build to 120 to 125 psi before it purges ,,,
Think everything else was covered in previous answers ....
Good luck ,,,,,,,,,,,,,,
2007-06-08 20:38:06 · answer #2 · answered by Littlebear 4 · 0⤊ 0⤋
you may want to have the brakes adjusted. you will want to turn them until they are snug and back them off 3/4 of a turn. i work for a dump truck business and we had the same problem with a western star truck.
2007-06-08 20:09:14 · answer #3 · answered by billjcrawfordsr 1 · 0⤊ 0⤋
adjust the cam overs check for leaks. Does it hold air pressure or does it leak down?
2007-06-08 20:19:56 · answer #4 · answered by Steve A 2 · 0⤊ 0⤋