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Old 08-24-2011, 11:31 PM   #1
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Brake pedal is soft

I have an 89 jeep wrangler sahara.
Ok, here is what I have done so far. I have replaced all the brake pads, front and back. The back I used a rebuild kit to replace all the drum parts. I have replaced the master cylinder, and I did prep the master cylinder per manufacture specs. We bled the brake lines LR,RR,RF,LF twice. Still the pedal is soft.
Any ideas would be great! I'm lost!

The only other thing, I think I could replace is the front calipers. Could they be causing the issues.

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Old 08-24-2011, 11:50 PM   #2
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only if your loosing fluid would i replace that....sounds like theres air in the lines somewhere, normally your supposed to start with the farthest wheel out and work your way in, rr-lr-rf-lf...
where did u get the master cylinder from, autozone sometimes has bad batches

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Old 08-24-2011, 11:55 PM   #3
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also how are u bleeding them? are you pumping up then opening bleeder, or are i doing it the right way and holding steady even pressure push down the pedal after each time u pump up pressure
also u need to keep a very close eye on the resivoir...after each brake...
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Old 08-25-2011, 12:20 AM   #4
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only if your loosing fluid would i replace that....sounds like theres air in the lines somewhere, normally your supposed to start with the farthest wheel out and work your way in, rr-lr-rf-lf...
where did u get the master cylinder from, autozone sometimes has bad batches

Do you have an oreillys near you? Get a master cylinder from there a new one if you can autozone has remand. Not knocking them. Just saying. I work for oreillys our return/warranty rate is extremely low. But autozone is neverlast- pure shit.
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Old 08-25-2011, 01:14 AM   #5
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Originally Posted by kb912

Do you have an oreillys near you? Get a master cylinder from there a new one if you can autozone has remand. Not knocking them. Just saying. I work for oreillys our return/warranty rate is extremely low. But autozone is neverlast- pure shit.
idk why u quoted what i said...lol not everything from azone is bad...i go there for all my parts and havent been burned yet
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Old 08-25-2011, 06:33 AM   #6
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I got the master cylinder from my local dealer. Not a auto zone. And I bless brakes in sequence looking at jeep facing front LR,RR,LF,RF. I had the person in jeep push down on brake and then I open and closed the bleeder. Once bleeder was closed I instructed driver to let off brake and push down again and repeated this 5 times while checking reservoir.
Also the condition of the softness was happening before the new master cylinder was installed.

Also when braking hard jeep pulls to left a bit.

Stoping in gravel the back brakes lock up before the fronts.
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Old 08-25-2011, 06:55 AM   #7
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Originally Posted by sharkb8 View Post
I got the master cylinder from my local dealer. Not a auto zone. And I bless brakes in sequence looking at jeep facing front LR,RR,LF,RF. I had the person in jeep push down on brake and then I open and closed the bleeder. Once bleeder was closed I instructed driver to let off brake and push down again and repeated this 5 times while checking reservoir.
Also the condition of the softness was happening before the new master cylinder was installed.

Also when braking hard jeep pulls to left a bit.

Stoping in gravel the back brakes lock up before the fronts.
You could definately have a bad front caliper. When I did the rear brakes only on my 89 we had to do the bleed drill at least 20X before all of the air was out, now it's great. You could definately be getting air in the system. Check all of your lines, rear wheel cylinders and calipers. Pulling to the left like that is probably a front caliper not operating properly, most likely the right.
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Old 08-25-2011, 08:23 AM   #8
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Ok I think I will replace both front calipers. The go thru the PAINFUL bleeding process again for the 20th time:-)

Any suggestions on calipers? I figure I will just buy them on line preloaded.
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Old 08-25-2011, 08:30 AM   #9
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On one more note: there was a major amount of sediment in the old master cylinder so im guessing that could be a cause for a possible caliper issue.

I will post my findings
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Old 08-25-2011, 10:40 AM   #10
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You mite look in getting a Mitty Vac to help in bleeding the brakes, there only about $30.00 bucks and there great. and when talking about whats left and right on a vehicle it's as sitting in the drivers seat, drivers side is left and pass. side is right, hope this helps.
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Old 08-25-2011, 12:02 PM   #11
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Sounds like a piston in a caliper is hanging up, this will make the brake pad hit the rotor on an angle, thus the spongy pedal and the pull...or a pad could be cocked on the caliper.

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