I have the original problem with my brakes.
the rear air brakes "lock up"
I have the truck in my farm shop, and have it hooked up to shop air(120)lbs keep from running the truck engine.
When I press the brake pedal the brakes engage as normal, and sometimes when "stab" the brakes hard, it will engage and slowly, and I do mean slowly release....bleed off. I most likely do not speak the language but, I have replaced the QR valve on the block feeding the rear bellows. and I have put oil in the system feeding the brake pedal. it seems slightly better but still locks up.
what am I missing? just dawned on me I do not know if it locking up the front brakes or not.
the rear air brakes "lock up"
I have the truck in my farm shop, and have it hooked up to shop air(120)lbs keep from running the truck engine.
When I press the brake pedal the brakes engage as normal, and sometimes when "stab" the brakes hard, it will engage and slowly, and I do mean slowly release....bleed off. I most likely do not speak the language but, I have replaced the QR valve on the block feeding the rear bellows. and I have put oil in the system feeding the brake pedal. it seems slightly better but still locks up.
what am I missing? just dawned on me I do not know if it locking up the front brakes or not.