Brakes - No pressure in pedal - JeepForum.com
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post #1 of 20 Old 10-01-2013, 12:32 PM Thread Starter
jaycal3
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Brakes - No pressure in pedal

I have a 93, 4.0L M/T and its a 3rd vehicle so it gets driven infrequently. It sat for about a week since I last drove it and when I got in it and started to pull out of the driveway the brake pedal went all the way to the floor with little to no pressure. The red "Brake" light also came on in the steering cluster. I turned the jeep off and pumped the brake and pressure seemed to come back to the pedal and when I restarted it, I lost pressure again. I am thinking its the master cylinder. I checked for fluid loss, and there are 2 sides in the master for fluid. Looking at it from the drivers side of the Jeep, the left side is empty or low and the right side is full. I see NO leakage anywhere under the Jeep. All 4 wheels/hubs are dry. I also see no leakage at the master or booster on the firewall. Thoughts? I will be doing a brake job hopefully this week and will be replacing the calipers, rotors and pads... the caliper on the front right is freezing and not releasing. Could this be my issue or part of it as well?


93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

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post #2 of 20 Old 10-01-2013, 01:43 PM
Siva283
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If it was empty its leaking somewhere and now there is air in the master too so the entire system needs to be bled at a minimum.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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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.

Ask me how I know...
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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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post #3 of 20 Old 10-01-2013, 07:57 PM
Mark05059
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fill up the master and have someone push the pedal... might have to pump the pedal to get some pressure in it... after you get pressure have them put steady pressure on it while you look under it for dripping brake fluid... once you find that look closer to where its coming from and then fix it. Once you have it fixed you will have bleed all 4 corners

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
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post #4 of 20 Old 10-01-2013, 09:12 PM Thread Starter
jaycal3
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Ok guys, thanks for the help. I will get some fluid along with the other parts... maybe hold off on the master. I guess I have a leak somewhere from what you are both saying.

93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

Do your part for Leukemia research - help find a cure.
http://mskcc.convio.net/goto/Jay_Calabrese
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post #5 of 20 Old 10-01-2013, 09:15 PM
mnewxcv
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when that happened to me it was a wheel cylinder. cheap enough to replace both and call it a day. good time to replace the little things. preventative maintenance since youll be in there anyways.
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post #6 of 20 Old 10-01-2013, 09:44 PM
rambo3489
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The front smaller one should be for the rear brakes. I bet your wheel cylinder is leaking. Not the end of the world. Plus you can get new shoes back there.

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post #7 of 20 Old 10-01-2013, 10:32 PM
ashland82391
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Just had this problem and fixed it today. It was a small pin sized rust hole in my steel brake line. Look around and follow your lines and see if there are any wet spots along the line. If it is the line, replace it with copper.
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post #8 of 20 Old 10-01-2013, 10:37 PM
rambo3489
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Quote:
Originally Posted by ashland82391 View Post
Just had this problem and fixed it today. It was a small pin sized rust hole in my steel brake line. Look around and follow your lines and see if there are any wet spots along the line. If it is the line, replace it with copper.
What in the rusty 8.8 do you got going on up there?

Sent from my phone because I'm doing something "more important"

89 YJ.. My first jeep and I won't let it go. ▀||||▀

Current Project: None... I disgust myself.

<a href="http://www.jeepforum.com/forum/f22/my-yj-build-adventures-thread-1356941">BUILDING THE YJ MY WAY</a>
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post #9 of 20 Old 10-01-2013, 11:25 PM
ashland82391
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Quote:
Originally Posted by rambo3489 View Post

What in the rusty 8.8 do you got going on up there?

Sent from my phone because I'm doing something "more important"
No it was the lines on the frame. And it's not rusty! Just a crappy cover lol

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post #10 of 20 Old 10-02-2013, 02:53 AM
Mark05059
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Quote:
Originally Posted by ashland82391 View Post
Just had this problem and fixed it today. It was a small pin sized rust hole in my steel brake line. Look around and follow your lines and see if there are any wet spots along the line. If it is the line, replace it with copper.
this wouldn't be the copper tubing you buy off the shelf for like plumbing etc... it would have to be rated for brake lines (nicopp) since plain copper is illegal in some US states.

1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
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post #11 of 20 Old 10-02-2013, 03:01 AM
ashland82391
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Quote:
Originally Posted by Mark05059 View Post

this wouldn't be the copper tubing you buy off the shelf for like plumbing etc... it would have to be rated for brake lines (nicopp) since plain copper is illegal in some US states.
Thought that was just common sense???

You can just puck it up from any AutoZone.
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post #12 of 20 Old 10-02-2013, 05:34 AM
Siva283
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Quote:
Originally Posted by ashland82391 View Post
Thought that was just common sense???

You can just puck it up from any AutoZone.
Never assume anyone has common sense when it comes to items like brakes.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
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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post #13 of 20 Old 10-02-2013, 04:13 PM Thread Starter
jaycal3
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Found the culprit. Pinhole leak on the left frame rail. Master cylinder stays and brake line gets replaced. Can I get one pre bent?

Sent from my iPhone using JeepForum... So excuse the typos, my iPhone is challenged.

93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

Do your part for Leukemia research - help find a cure.
http://mskcc.convio.net/goto/Jay_Calabrese
KCCO
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post #14 of 20 Old 10-02-2013, 04:55 PM
Apollo12227
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Quote:
Originally Posted by jaycal3 View Post
Found the culprit. Pinhole leak on the left frame rail. Master cylinder stays and brake line gets replaced. Can I get one pre bent?

Sent from my iPhone using JeepForum... So excuse the typos, my iPhone is challenged.
You can buy a few feet of brake line and a cheap bender for a few bucks at autozone. Bend it yourself. You will also need to rent a single/double flairing tool and the appropriate fitting. Pretty basic stuff, the guy at the counter should be able to help.

Are you just going to cut out the bad section and splice new line in? Or are you replacing all of it?
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post #15 of 20 Old 10-02-2013, 05:07 PM Thread Starter
jaycal3
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Quote:
Originally Posted by Apollo12227
You can buy a few feet of brake line and a cheap bender for a few bucks at autozone. Bend it yourself. You will also need to rent a single/double flairing tool and the appropriate fitting. Pretty basic stuff, the guy at the counter should be able to help. Are you just going to cut out the bad section and splice new line in? Or are you replacing all of it?
Not really sure... Easier to cut a section, but better to replace the whole thing I assume?

Sent from my iPhone using JeepForum... So excuse the typos, my iPhone is challenged.

93 YJ, 6 cyl,3.5" BDS,1" Prothane BL,1/2" booms, 33" Mickey Thompson MTZ on MT Beadlocks.

Do your part for Leukemia research - help find a cure.
http://mskcc.convio.net/goto/Jay_Calabrese
KCCO
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