Brake Question RABS
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From: Eastern N.C.
Brake Question RABS
Can someone straighten me out, there seems not to be a unified consensus on the RABS. I have a 1995 XL F150 4.9l 4x4, which I believe has rear only abs. When replacing my brake lines I realized that the ABS unit had been bypassed. For fear that it was not functioning I also bypassed it. Now my question. Does this ABS hydraulic valve also function as a proportioning or metering valve to decrease braking pressure to the rear drums? If so, is it necessary? I appear to have sufficient braking. Could this also be a source of my parking brake woes? I think not, because the cables seemed seized but just a thought.
Thanks, Mark
Thanks, Mark
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Junior User
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From: Eastern N.C.
bump
all new lines, cylinders, flex lines, calipers and brake pads... but somethings not quite right. I bought a pressure bleeder because I thought it would negate bench bleeding the MC. Looks like I need to try to do this. I don't know? If only one disc brake was working I would be swerving to one side. Seems like when I brake I can hear/feel the rotation of the wheels... its not smooth like I expect it to be. Adjusted Drums manually to the point where they begin to drag, I can spin the wheel by hand exactly one rotation. How long should it take to break in the new brakes?
Thanks.
Mark
all new lines, cylinders, flex lines, calipers and brake pads... but somethings not quite right. I bought a pressure bleeder because I thought it would negate bench bleeding the MC. Looks like I need to try to do this. I don't know? If only one disc brake was working I would be swerving to one side. Seems like when I brake I can hear/feel the rotation of the wheels... its not smooth like I expect it to be. Adjusted Drums manually to the point where they begin to drag, I can spin the wheel by hand exactly one rotation. How long should it take to break in the new brakes?
Thanks.
Mark
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Junior User
Joined: Jan 2013
Posts: 55
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From: Eastern N.C.
Okay folks,
after some more research here is what I have found... there is no proportioning valve for this truck, rather a residual pressure valve off of the master cylinder. This info thanks to Steve83 (1983 Ford Bronco Brakes & Hubs picture | SuperMotors.net).
Also BTW parking brake problems are solved... so minor issue of pulsating breaks. Must be because I didn't have the rotors machined? Or could it be coming from the back drums? Also it appears that brake pad retaining clips are rubbing the rims? Possibly just rubbing off layers of grime that have accumulated but this needs closer inspection.
More to come later
after some more research here is what I have found... there is no proportioning valve for this truck, rather a residual pressure valve off of the master cylinder. This info thanks to Steve83 (1983 Ford Bronco Brakes & Hubs picture | SuperMotors.net).
Also BTW parking brake problems are solved... so minor issue of pulsating breaks. Must be because I didn't have the rotors machined? Or could it be coming from the back drums? Also it appears that brake pad retaining clips are rubbing the rims? Possibly just rubbing off layers of grime that have accumulated but this needs closer inspection.
More to come later
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