What is makin the trailer brakes not release on a 1999 sterling tractor truck?
when you release the brakes (pushing in yellow and red release buttons) ,tp1and tp2 do the rods in the chambers retract in to cans, ? where is the air going ? you may want to just crack 1 line at a time to see and follow air as it moves from tractor to trailer , no chance glad hands are reversed ? are your slack adjusters moving?are air tanks full 120-150 psi ?what happens when you manually retract slacks,that should cause rod to go into can , are brakes in very good condition ?(lining,springs,"S" cams and bushings drums ), you said you replaced valves does that include quick release valves (QR1) and relay valves ? did you also change anti compounding valve ?what happens when you push on brakes and dash valves are released ,where is the air going , do you think there's any problems with ABS if equipped ? if you manually retract brakes (using lock out devices or keys ) do brakes release , PLEASE don't get mad when you read this I'm just giving things to think of , I have done 100's of truck and trailer brakes , and it sounds like you did every thing and then some to try to get it to work . I really hope I helped you . Woody.
Sep 04, 2014 |
Cars & Trucks