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Old 04-27-2010, 10:30 PM
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Low Brake Pedal

First off I am new here and I love Jeeps...
Ok,here is the history of my ZJ's Brakes and I need a direction to go in and hopefully after my detailed description I can get some resolution..
The 1'st time I replaced my brake pads and rotors my Brakes were the very best I have ever had in any Jeep I have ever owned..THEN,the next time I needed brake pad and rotor replacement I decided to replace all 4 Calipers,Stainless Braided Brake Lines along with New Pads and Rotors,here I am thinking boy oh boy when I get it back it should have a firmer brake pedal with the new brake lines installed but of course that wasn't the case,the pedal was low,felt spongy like there was in fact air in the system..had it bled,still the same...Ok,well my ZJ is 13 years old maybe I need a new Power Brake Booster and New Mater Cylinder,still low...
Now it stops OK when you step on it but the pedal isn't high,firm or anything like I believe it should be or like it used to be for that matter...
I dealt with that for the life of those pads and rotors,time to replace them again just a few weeks ago,my buddy who installed the new pads and rotors drove it before he replaced these items and said yeah your brake pedal feels like crap,it's low and feels like there is air in there..
He bled them all ALOT..I was helping by checking the master making sure it didn't go low on fluid as well as pumping the brake pedal up like 4-5 time per wheel..he said NO air was coming out but a steady stream of fluid..
Results?Still the same...I have been told by ONE person that he has heard of stainless braided brake lines causing a low pedal????
Anyone one here ever hear of that?
lastly is there ANYTHING else I should be looking into?
The friend of mine who just replaced the brakes is a gear head,builds all his own motors,etc... He knows what he's doing and says I don't know what eles to tell you,there isn't much else to a braking system..
Any and all Ideas,help would be greatly appreciated.
Thank you all for taking the time to read my dreadfully long 1'st post here @ JG..
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Old 04-28-2010, 01:07 AM
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Re: Low Brake Pedal

Welcome and really sounds like you tried all options nothing else that I can see
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Old 04-28-2010, 03:55 AM
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Re: Low Brake Pedal

I had the same problem. Did the breaks all the way around, bled the brakes, AND replaced the brake bottle (sorry its late and I'm tried and I can't remember the name of the part lol) and I still had the same problem. I never replaced the brake booster and that might be your problem. I just left it the way it was and it gave me about 50K of dependable braking from stopping me at a red light to dumping the breaks when I see a cop
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Old 04-28-2010, 08:45 AM
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Re: Low Brake Pedal

Yeah,I did replace the Power Brake Booster ALONG with the master cylinder..
It does stop and it's not terrible but am sick of the low,soft pedal and pretty much after all of the $$ I spent it's no better....
Just VERY annoying..
Thanks guys..
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Old 05-08-2010, 10:45 AM
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Re: Low Brake Pedal

I thought that once you get air into the system you need to bleed the abs pump as well. Don't quote me on this but it may be worth a shot.
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Old 05-24-2010, 06:34 PM
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Re: Low Brake Pedal

if its abs like my 93 then you need to bleed the breks with the key in the run postion as this will alow the abs pump to run
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Old 07-05-2010, 10:24 PM
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Re: Low Brake Pedal

Thanks for the advice BUT I have 1 other question about the whole ABS thing.Which of course my 98 does have (ABS).
Do I need this scan tool I have been reading about?
Or will just having my key turned to the on position cycle the ABS pump?
Thank you guys much for the replies.
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Old 07-08-2010, 10:46 PM
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Re: Low Brake Pedal

it should cycle the abs pump
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Old 07-15-2010, 10:18 PM
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Re: Low Brake Pedal

i agree.. i would bleed/ prime the ABS pump.. as far as a scan tool... i needed one for a 93 ZJ when i turned it into a woods buggy.. and that was pre OBD2.. where is the ABS computer located on the 96-98 ZJs?? although the pump does circulate and if you are under the hood while someone turns the key on you can hear mine prime for a start up test.... but you might be able to get away with it yours being an OBD2 system an all.. idk..

let us know.. keep us updated..
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Old 10-09-2010, 02:18 PM
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Re: Low Brake Pedal

There is an automated ABS bleeding procedure that must be performed using a scan tool. Also, it must be performed before you then do the manual brake bleeding.

Not that I am having any better luck. I bought a 93 with a low, soft brake pedal, abs light was on.

I replaced all the brakes with the best available parts, no help. Performed abs diagnostics & replaced the controller per test results. No help, light still on. Replaced the ABS hydraulic unit, ABS light went off, but still spongy pedal.

Replaced the master cylinder and booster, brake pedal is much, much better, but still not perfect. It's good enough for now though, I am giving up. BTW, embarrasingly, I own a repair shop and am an ASE Master Tech in three fields and still can't figure this out. I'll post more if/when I do.
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Old 02-26-2011, 07:40 PM
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Just got my ZJ last week and mine is very spongy with lots of travel. Brake pads & rotors are fine. Haven't looked into it yet. I will subscribe to this thread.
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Old 02-26-2011, 07:55 PM
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Re: Low Brake Pedal

There is probably air in the Brake System.
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