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Old 01-04-2014, 04:27 PM   #1
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Rear Brakes 1992 YJ

Well here is my problem my 1992 YJ jeep does not want to stop. I just don't know what else to do. I replaced the master cylinder, brake booster, Front brake rotors and new brake shoes, Rear drums, new hardware and pads and slave cylinder. I adjusted the rear brakes and bleed the lines. Still does not to stop like a jeep should. The dam brakes won't even lock up. I did noticed the fronts will while backing up because I can hear and see the skid marks. I even jacked the jeep up on all 4s and checked the brakes. They seem to be working but when tested on the road it still keeps on moving. When I apply the brakes very hard at 30 miles per hour. It just does not stop. Any suggestion out there in the jeep world of brake repair.

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Old 01-04-2014, 04:47 PM   #2
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Well here is my problem my 1992 YJ jeep does not want to stop. I just don't know what else to do. I replaced the master cylinder, brake booster, Front brake rotors and new brake shoes, Rear drums, new hardware and pads and slave cylinder. I adjusted the rear brakes and bleed the lines. Still does not to stop like a jeep should. The dam brakes won't even lock up. I did noticed the fronts will while backing up because I can hear and see the skid marks. I even jacked the jeep up on all 4s and checked the brakes. They seem to be working but when tested on the road it still keeps on moving. When I apply the brakes very hard at 30 miles per hour. It just does not stop. Any suggestion out there in the jeep world of brake repair.
Are you sure you bled them? Sounds like you have loads of air in the lines.

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Old 01-04-2014, 05:25 PM   #3
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You lifted and bigger tires?

But yeah bleed em out again RR, LR, RF and LF.

Check vacuum at the booster. If you replaced it did you adjust the bullet on the end if the plunger correctly to give you the amount if throw to the Master Cylinder.

Did you bench bleed the master prior to install that will cause the issue also???
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Old 01-05-2014, 08:02 PM   #4
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I bleed the brakes did not make any difference. I have plenty of brake pedal. I did not install the booster myself. I am planning on taking it back to the shop who installed it.

When I purchased the jeep the brakes did not work very well. I was told by owner of this. I did all that work and the only difference was more brake pedal. The darn jeep braking has not change one bit since the day I bought the jeep. I have spent about $ 800 on the brake system and no difference in braking at all. I am starting to wonder if the brake booster is a wrong model. What else could it be.
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Old 01-06-2014, 09:31 AM   #5
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There is an adjustable pin inside the booster that actuates the MC piston. If this is not adjusted properly you willl have either poor brake performance or the brakes will lock up after driving for a while.
Check out this link Page 52...
http://www.autoshop101.com/forms/brake05.pdf
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Old 01-06-2014, 11:27 AM   #6
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Thanks for the info, I talked to the person who worked and installed the booster. He said that the booster probably needs to be adjusted. I hope this will work.
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Old 01-08-2014, 07:25 PM   #7
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Well I took my Jeep back into the brake shop that installed the booster. This guy looked the entire brake system over and he even put in different rotors and brakes, no different in the stopping power, he said. He is going to replace the booster again, just in case there was a problem with the other one he installed, which there probably not. make a bit of difference. I give up on this 1992 YJ. I guess the brakes just don't work very well on the 92s.
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Old 01-08-2014, 07:43 PM   #8
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You lifted and bigger tires?

But yeah bleed em out again RR, LR, RF and LF.

Check vacuum at the booster. If you replaced it did you adjust the bullet on the end if the plunger correctly to give you the amount if throw to the Master Cylinder.

Did you bench bleed the master prior to install that will cause the issue also???
X2^^^ lifted/ large tires? What size tires r u running? I'm sure 35's would cause lack if breaking power on stock size brakes...
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Old 01-08-2014, 08:47 PM   #9
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He checked the vacuum and it was fine. I bleed the brakes again before I took it back to him. The jeep will stop but when I hit the brakes going 4o miles an hour with the pedal to the floor it still moves about 10 feet. It will not lock up. I never own a jeep before but I surely thought the brakes would be better than that.
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Old 01-08-2014, 09:05 PM   #10
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WHAT SIZE TIRES ARE YOU RUNNING????

DO YOU HAVE A LIFT?????

...sorry did i yell
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Old 01-08-2014, 09:21 PM   #11
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He'll I got huge brake peddle and performance parts and cannot lick the up at 40 mph.

You got bigger than stick wheels and tires on a lift. Unless you went to a wildly expensive brake set up you got what your going to get.

If you want something with better brakes sell it.
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Old 01-09-2014, 03:58 AM   #12
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My '92 stops on a dime. Like everyone else is asking.....is it lifted and do you have bigger tires and wheels? Aside from adding to the unsprung weight of the vehicle the larger tires decrease the mechanical advantage of drum/rotor vs tire/wheel.
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Old 01-09-2014, 11:16 AM   #13
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I have an 88 with a 4" lift and 33's, I can lock up the brakes at will...
Are the rear shoes in good condition and adjusted properly (I assume that they are)...
P
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Old 01-09-2014, 03:39 PM   #14
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WHAT SIZE TIRES ARE YOU RUNNING????

DO YOU HAVE A LIFT?????

...sorry did i yell
2 inch lift and I am running 31 on the tire size
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Old 01-09-2014, 04:06 PM   #15
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Ok. Tire size is not causing that problem. Maybe pinched brake lines? Maybe wrong fluid in system? I don't know but the "brake shop" shoulda found, and fixed the problem...
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Old 01-09-2014, 06:35 PM   #16
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Ok. Tire size is not causing that problem. Maybe pinched brake lines? Maybe wrong fluid in system? I don't know but the "brake shop" shoulda found, and fixed the problem...
Well I got a call from the brake shop today, nothing has changed. He installed another booster and made no difference he said. I have all new brakes shoes, drums, and rotors. He even checked the vacuum and it was ok.
The jeep is lifted to two inches and I have 31s on there for my tires. He said maybe the tires size is causing the problem. I don't know what else to do. There is a jeep special shop in town I was thinking about running it over to him to have a look.
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Old 01-09-2014, 08:04 PM   #17
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Hate to see you spend lots of money with no return on the problem. I still don't think 31's would cause that?
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Old 01-09-2014, 08:22 PM   #18
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When you installed the new master did you bench bleed it? You are saying that you keep bleeding the lines... Are you seeing air bubbles? If you did not bench bleed the master you will never get the air out, hence the soft brakes.
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Old 01-09-2014, 08:35 PM   #19
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Why haven't you called the Brake Wizard?

I'm talking about Blaine (he's a vendor here, his website is blackmagicbrakes.com ).

There are a lot of over the counter parts out there that are inferior.
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Old 01-09-2014, 08:36 PM   #20
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When you installed the new master did you bench bleed it? You are saying that you keep bleeding the lines... Are you seeing air bubbles? If you did not bench bleed the master you will never get the air out, hence the soft brakes.
This is 100% correct and key!
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Old 01-09-2014, 11:01 PM   #21
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Well tomorrow I will ask the shop if they bench bleed the master cylinder. I will also call the brake Wizard tomorrow too. Thanks for the help.
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Old 01-10-2014, 04:20 PM   #22
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Well tomorrow I will ask the shop if they bench bleed the master cylinder. I will also call the brake Wizard tomorrow too. Thanks for the help.
Well I picked up the jeep from the brake shop. He put on different rotors and pads. He installed a new booster and master cylinder. He replaced the rear brake slave cylinders. He bleed the brakes. He checked the vacuum which was 19 on the low side. He said after all that work it seem to work a little better.

Well I called Blane at black magic brakes. He told me to get in the jeep and press the pedal down until it got hard. He said then to start the jeep. He asked how far did the pedal go down after I started it. I told him about a 1.5 inches. He said that is good. He told me then to take it out and drive it. He said to go about 35 mile an hour and slam on the brakes. He said to do this about 5 or 6 times until the brakes got hot. He said then drive it until the brakes cool off. So I followed his direction. He said then test the brakes again and I did. Believe it or not they locked up. I did this several times and locked up again and again and again. The brakes are working like they should. What a relief. I think the only thing that I am going to do now is have the vacuum checked.

I wanted to thank everyone on the site here trying to help me figure out these brakes. Thanks again for the help.
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Old 01-10-2014, 11:03 PM   #23
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Nice report back.

I too have issues and have found the problem. Seems my WJ proportioning valve I installed for my 8.8 swap has been dragging the brakes and glazed the pads and rotors but they weren't warped. So turned the rotors sanded the pads and what do you know 35 mph and all the screeching and smoke you can handle. Looked bitchin and sounded even better.

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