Tylerzap Posted November 18, 2016 Share Posted November 18, 2016 So i have a 1988 comanche 4.0 Brakes weren't great when I bought the truck, replaced a leaking wheel cylinder and bled. Brakes didnt completely go out but lost all pressure one day. So far, it has brand new: Wheel cylinders Brake shoes & pads Hardware kits Front soft lines Front calipers (2) Master cylinders I have also deleted the height sensing valve, and ran a new straight peice of hardline to the rear softline. Got rid of the failsafe line and plugged it. all brake lines are clean and rust free I bleed rr, lr, rf, lf No matter what I do they don't get better. I have used a solid 3 gallons of brake fluid through all this, bleeding the lines so much as needed, and there are no leaks. Only original parts are the booster, which is working fine, the hardlines from the master to the combo valve, and the ones from the combo valve to either front wheel. Like I said, no visible leaks and I have brake cleaned and searched alot. When you press the petal, it doesn't have any pressure against your foot. Like stepping into a bucket of water. But the brakes are working, just not at full capacity, will still lock all 4 on dirt. Help, please. Link to comment Share on other sites More sharing options...
87MJTIM Posted November 18, 2016 Share Posted November 18, 2016 Have you replace the master cyl? Could be leaking post the plunger. edit: just read your other post. Nevermind Link to comment Share on other sites More sharing options...
Eagle Posted November 19, 2016 Share Posted November 19, 2016 I have also deleted the height sensing valve, and ran a new straight peice of hardline to the rear softline. Got rid of the failsafe line and plugged it. Which line from the front to the rear did you remove, and which one did you keep (replace)? Link to comment Share on other sites More sharing options...
Tylerzap Posted November 20, 2016 Author Share Posted November 20, 2016 Left the original line that runs from the front of the combo valve and plugged the failsafe at the bottom of the combo valve. I ran new line behind the gas tank to the rear softline, about 1.5 feet. Brakes weren't great and then they just kind of "let go" one day and I've been trying to track what happened. Nothing I have already replaced has made it worse or better. There has to be a hole somewhere right? I just can't find where. Link to comment Share on other sites More sharing options...
Tylerzap Posted November 20, 2016 Author Share Posted November 20, 2016 It has brakes (not great but all 4 will lock on dirt), they will not build up with pumping, and no feeling whatsoever. Soft petal. Calipers are on right side up and I bench bled the master before I put it on Link to comment Share on other sites More sharing options...
Eagle Posted November 20, 2016 Share Posted November 20, 2016 I don't see any mention of a new rear soft line. You've done everything else, so I would replace that and see what happens. Link to comment Share on other sites More sharing options...
Tylerzap Posted November 20, 2016 Author Share Posted November 20, 2016 Alright I will give it a shot. Link to comment Share on other sites More sharing options...
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