bob weaver

replaced the front calipers per a jeep buddy's recomendation(sponsored racer, not just a jeep "enthusiast"). drove around without the emergency bypass switch plugged in and got the front calipers to start engaging. bled the lines in correct order one more time, and took her for a couple more laps. now i can get the front to engage but the "brake" light comes on immediately as the calipers engage, then it feels like they disengage as the brake light goes off. the light does not come on every time, but i feel the front release and only pumping the peddle gets them to re-engage/ me to stop, peddle to the floor. there is NO air in the rear lines, but no matter how many times i bleed the front down to no air, more air seems to appear the next time i bleed them. it would seem that i need a new proportioning valve (only way to get a new er-bypass-valve), and/or there is still air in the master, and/or still a mystery leak(but since i lose no fluid level in the master after miles of pumping the brakes i will have to assume there are none). day 6 tomorrow.

ok, so i replaced the power booster (source of the hissing) and the master cylinder. started to bleed the lines, rear is clear but front keeps getting significant air bubbles, mostly on the drivers side and I'm not sure from where... i've checked all the hard & soft lines for leaks, they seem solid. my emergency bypass is open, (brake light on dash will not turn off and front brakes will not engage) despite my efforts to reset it by unplugging it then disconnecting the battery. is it possible the bypass valve being open is letting air into the front lines? is there a way to reset this valve/sensor, or is it possibly functional and reacting to the mystery leak i haven't found? any ways to test each line idividually for leaks? anybody been here before? any suggestions will save my $ at the brake shop, i'd hate to bring it in when i'm so close to finishing! thanks for all those who have responded in a helpful way!

ha! "Stephanie"= auto correct of "its definitely" thanks for the help guys

find out when I get home, gonna have to locate that leak and then bleed the lines. funny, several people I've talked to open vavles/lines when doing pads & consider it common knowledge and almost as many don't think you need to. even though it totally makes sense I'd never been advised to... amazed this hasn't happened before!

no leaks that I could see on the soft lines or the calipers. and it's hard to tell whether or not there was a leak in the master cylinder because I opened the reservoir cap before checking. the hissing noises when the brake pedal is depressed and Stephanie coming from somewhere around the master cylinder reservoir. tighten everything up and its still making a hissing noise and bubbling in the reservoir when I pump the brakes.

no I did not open the bleeder valve before compressing the pistons. I've been changing brake pads on older vehicles (including several cherokees)for over 20 years without ever having to do more to regain pressure than pump the brakes a few times after reinstalling. guess there's a first time for everything, d'oh!

i compressed the caliper piston, disassembled the caliper, put in the new pads, reattached the caliper and attempted to drive the vehicle. it may not be the "ebrake", but the vehicle does not roll freely, maybe the calipers are not disengaging the piston pressure? i assumed it was ebrake because of the light, not realizing that is also my brake warning light. the hissing is coming from the ms and air seems to have gotten into the line if it's bubbling when i pump the brake peddle, right?

sorry, i replaced the front pads, on the discs. i didn't think that would require any bleeding. the "hissing" may be my master seal? i had my neihbor pump the brakes with the cap/lid off the ms rez and air came shooting up with the same hissing noise. put the cap back on once the air stopped and the peddle went stiff and there is still a hissing noise when the peddle is pumped and it goes to the floor. perhaps the seal on the ms is shot? theres no leaking at the front, and i did not touch the rear.

hi guys, new renix owner here, 88. i just unwittingly changed my pads without reading "how to" in advance and now i have no brake pressure. it just goes to the floor, and my ebrake seems to partially engage and theres a hissing noise. What the hecks going on here? do i need to bleed the lines? i'm reading about the load sensor in some other threads, how does that have issue with compressing a piston(s) on the front caliper(s)? HELP? !??!??!?!! ps did i mention this is my DD? i need a solution i can pull of asap.