Brake Problem Soft Pedal - JeepForum.com

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post #1 of 23 Old 05-07-2013, 04:52 PM Thread Starter
70worm
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Brake Problem Soft Pedal

So I put new u-joints and pads on the front of my YJ back in Jan. After that I have a real soft pedal and comes to a slow stop. My brakes were not very good before that, but they really don't work good now. Since this happened I have changed the pro-valve, rotors, master cyl, pads, and bled about 20 times. Yes my bleeders are above the line. 2 years ago I replaced pads, rubber and metal lines, and MC. Somebody told me it's possible for rubber line the get a bulge in it when you hit the brakes and cause this, I don't think that's the problem.

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post #2 of 23 Old 05-07-2013, 05:36 PM
Chrisnvegas
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If your lines and rear wheel cylinders all check ok, try re-bleeding the master cylinder.

What happens in my Jeep, stays in my Jeep
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post #3 of 23 Old 05-07-2013, 06:33 PM Thread Starter
70worm
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I'm gonna rebleed MC tomorrow
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post #4 of 23 Old 05-07-2013, 07:15 PM
pasinbuy
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I am not sure what you mean by your bleeders are above the line. A common mistake and I have done it myself is to buy two of the same calipers or to mix the calipers on the wrong wheel.

Look at your calipers and see if the bleeder is on top with both calipers.

Another thing to look at is the caliper rubber hose. Have someone push on the brakes with the motor running and you hold onto the rubber lines. Have the person inside pump the brakes slowly and hard for you to check and see if the rubber lines are expanding.

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post #5 of 23 Old 05-07-2013, 07:27 PM
87TPIYJ
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If that doesn't work it could be your booster. I had the same problem. If it is don't buy a reman. I highly suggest doing a TJ booster/master swap or if you can find a 95 6cyl booster. You will be amazed at the difference. It's like a whole new vehicle.

YJ 350TPI NV4500 SOA 8.8 Flat skid
http://www.jeepforum.com/forum/f22/i...thread-1488489
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post #6 of 23 Old 05-07-2013, 08:01 PM
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post #7 of 23 Old 05-07-2013, 08:08 PM
Ksyrium
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Quote:
Originally Posted by 4.7stroker View Post
Are your rear brakes adjusted right?

Dwayne
^ +1
And (just to double check) rear brake pads put on correctly - 1 is for front & 1 is for the rear.
(Is it Longer on front side of the drum & shorter on R. side?) Been a few months since I rebuilt mine...

ΜΟΛΩΝ ΛΑΒΕ
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post #8 of 23 Old 05-08-2013, 06:20 PM Thread Starter
70worm
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I bench bled master today and no changes, so I ordered a booster.
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post #9 of 23 Old 05-12-2013, 05:19 PM Thread Starter
70worm
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Put on new booster and didn't fix it, then new shoes and drums. I got stronger brakes, but still wont lock up. It kinda like there's not enough brake pressure to stop the wait of the Jeep. I ordered new front hoses today.
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post #10 of 23 Old 05-12-2013, 05:41 PM
jeeperjordan
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I had the same problem with my new jeep, i replaced everything and it ended up just being my bleeder screws were clogged. Not sure how that happened or ever even heard of that happening but just a thing to check just incase!
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post #11 of 23 Old 05-12-2013, 06:09 PM
87TPIYJ
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Have you tried to power bleed the system? U can make a home brew power blender for less than $3. I did a little write up on one. I'm on my phone now, but when I get to a computer I'll post a link.

YJ 350TPI NV4500 SOA 8.8 Flat skid
http://www.jeepforum.com/forum/f22/i...thread-1488489
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post #12 of 23 Old 05-13-2013, 05:05 AM
vadslram
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A bad booster wouldn't cause soft brakes (you already figured that out)
If you are positive you got rid of all the air I would bet you have some questionable rubber hoses in your brake system. They only have to expand a tiny bit to make the brakes soft.
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post #13 of 23 Old 05-13-2013, 06:03 AM
87TPIYJ
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Quote:
Originally Posted by vadslram View Post
A bad booster wouldn't cause soft brakes (you already figured that out).
It did for me. So your statement isn't entirely true.

YJ 350TPI NV4500 SOA 8.8 Flat skid
http://www.jeepforum.com/forum/f22/i...thread-1488489
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post #14 of 23 Old 05-13-2013, 07:36 AM
rodgers3
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what's you fluid look like? i lost all braking power in the rear because i got water in the fluid somehow.
flushed out all the bad fluid and its all good now.
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post #15 of 23 Old 05-13-2013, 12:15 PM
Siva283
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My pedal gets soft to tell me its time to adjust the rear brakes. Not replace them just adjust them. Most of your pedal travel comes from the rear brakes so I would check them first and go over them very well. Also there is a chance there is a bad seal in the MC. Can you pump up the brakes to temorarily get a stiffer pedal? (There are alot of jokes in there but since this is family friendly I will leave you to find them on your own)

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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