![]() To isolate the problem, disconnect the steel brake line from the master cylinder that supplies the rear brakes. Dirt can prevent the dump valve from fully seating and allow rear brake pressure to leak past the valve. But on Kelsey-Hayes rear-wheel ABS applications, the condition may be caused by dirt in the ABS modulator valve. I will say I was surprised by how much meat the shoes had on them, which might mean they haven't been working all that hard.Ī pedal that gradually sinks to the floor usually indicates a worn master cylinder. It seemed to come on suddenly to me, not like shoes slowly wearing, but then again maybe it was a "frog in the hot water" kind of situation and I just didn't notice it getting slowly worse. Some research is turning up threads on Dodge forums suggesting that rear brakes being out of adjustment might cause just these symptoms. And with the truck not running I have a great pedal, not spongy in the least. The symptoms now are exactlythe same as they were before with the original master cylinder. Nice smooth stream at all four corners.Įven though I skipped the bench bleed, I really don't think that's the problem. It took a while, but once I had fluid flowing all around I went back to the old's cool "pump-pump-pump-hold" with a clear tube so I could see the fluid being ejected. I used a vacuum bleeder, starting at the rear passenger side farthest from the master cylinder. I know I should have, but.well, I didn't. Do I throw a booster at it and hope? Or can anyone suggest where else the problem might lie?Ĭlick to expand.I did not. But as far as I know anything that goes wrong with the booster will cause a hard pedal (due to lack of assist) or dragging brakes (due to the pedal not returning). Those symptoms and their timing seem to point to a problem with the booster. Shut the truck off and back to a nice firm pedal. And it isn't air in the lines, I sat there and pumped 15-20 times and it never firmed up. Soft pedal, weak brakes, "ABS" and "Brake" lights illuminated. Fired it up to take it for a spin.and the problem is still there. Had a nice hard pedal sitting there in the driveway. Got it all back together and bled the system thoroughly. I picked up new front calipers too, just to be thorough. I plan on keeping the truck forever, so small investment. That led me to believe that the problem was probably in the master cylinder. (Then I had my wife pump the brakes while I watched the master cylinder, before I put the drums back on. ![]() Pulled the rear drums, wheel cylinders dry. Followed all the lines from the master cylinder to all four wheels, no sign of a leak. So this week I got underneath and checked it out. It felt just like a line had let go, soft pedal, weak brakes. A couple of weeks ago I started getting a soft brake pedal, followed shortly by the "ABS" and "Brake" lights coming on. I have a 1997 Dodge Ram 1500 2wd that I've owned since new.
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