Posted by hunt on December 01, 2015 at 01:12:49 from (199.218.126.91):
In Reply to: Help with semi brakes. posted by notjustair on November 30, 2015 at 22:40:45:
I agree with the others on several points. First check the actual adjustment of the brakes. It should have automatic slacks on it but may not be working. It probably has type 30 chambers on the drive axles and the push rods should not move more than 2 inches with the brakes applied 1 1/4- 1 1/2" would be better. Does it have parking brakes on all four drive wheels? I assume it is a tandem. If it does not have parking brakes on all wheels you will hear brakes move even with the parking brakes set on the other axle. Parking brakes can also be weak if the big spring is broke internally it may still move the pushrod but not apply adequate force to hold the vehicle on a grade. There is not any type of flow divider in the system except for some double check valves but they will not cause the problems you describe unless you have a leak while stepping on the brakes. The truck has a bobtail valve installed if you need to push the trailer supply valve in to have normal truck braking when a non-air braked trailer is connected.
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