Quote:
Originally Posted by Blue Bowtie
It is possibly a Kelsey-Hayes ABS unit, and would need to be cycled to bleed the brake lines to each wheel caliper/cylinder. That will require a scan tool capable of bi-directional communication. There is also a prop valve bolted to the face of the ABS unit, and it may be shifted and stuck. Cycling the ABS under pressure may relieve that, or it may have to be physically shifted.
It is also important to verify that the bleeder screw is not rusted shut. It may be necessary to completely remove the bleeder and run a small drill bit or pick through the cross-drilled holes to insure they are open.
After that, it's all just lines and the ABS unit.
http://www.askatech.com/AskATechLive...9.pdf#G1081872 |
Yes it is a Kelsey Hayes unit.
I had the truck at the dealer recently for a rear brake adjust and flush and fill fluid.
They told me they couldn't bleed the RR. I tried to ask questions but got vague answers about bleeding the RR.
The main reason I am wondering about the ABS unit is that the "sticking" brake was an issue before replacing the rear cylinders and all rear brake components. This was NOT done at the dealer so brake bleed may not have been done correctly with the scan tool.
I need to verify if there is one brake line running to the rear of the truck.
This ABS unit has a total of 5 lines. 2 of which are from the master cylinder.
This leads me to believe that there is only one line to the rear-end then it splits to left and right brakes cylinders.
If this is the case the the no bleed must be in the RR line or brake cylinder.