Brake issue.. - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 17 Old 01-14-2017, 02:41 PM Thread Starter
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Brake issue..

On my 07 I have a brake problem. The pedal won't return. I have replaced all the calipers, master cylinder and booster....Anyone have this problem? They have been bled multiple times with every method anyone has thought of...
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post #2 of 17 Old 01-14-2017, 09:00 PM
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What's your engine vacuum look like ?

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post #3 of 17 Old 01-15-2017, 12:11 PM
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On my 07 I have a brake problem. The pedal won't return. I have replaced all the calipers, master cylinder and booster....Anyone have this problem? They have been bled multiple times with every method anyone has thought of...
Sounds like the piston in the master cylinder stuck. You said it was a new master cylinder?

Can you grab the peddle with your hands and jerk it back up?

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post #4 of 17 Old 01-15-2017, 08:35 PM Thread Starter
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Yes I can pull it back up. 2 new master cylinders. Both have the same problem. I'm pretty sure it's not the master cylinder.
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post #5 of 17 Old 01-15-2017, 08:37 PM Thread Starter
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Vacuum is good. Everything else works fine and it still does it when not running.
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What's your engine vacuum look like ?

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post #6 of 17 Old 01-15-2017, 09:20 PM
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Not to insult anyone but are you fully bench bleeding the master prior to installing it?
Another thing to look at is up on the top of the brake pedal to see if there is a return spring that maybe is popped off? not sure if the JK even has one.....Just a thought
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post #7 of 17 Old 01-16-2017, 08:14 AM
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Originally Posted by Tspevacek View Post
Not to insult anyone but are you fully bench bleeding the master prior to installing it?
Another thing to look at is up on the top of the brake pedal to see if there is a return spring that maybe is popped off? not sure if the JK even has one.....Just a thought
The spring is inside the booster housing. There is a potential this spring broke or slid off to the side during install. It is tight quarters in there. Another possibility is the master cylinder did not line up with the brake pedal rod (I have done this before).

Otherwise it sounds like the booster if the pedal does not return.


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post #8 of 17 Old 01-16-2017, 12:11 PM
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I have never pulled a JK master cylinder, was not sure on the return spring set up but that sounds as an issue, the miss alignment of the push rod really sounds along the lines of the issue, seeing the European type construction of most things on these it is highly likely or it is not fully contacting the master, I know most of the BMWs have a preload set on the pushrod. Not sure if this is a completely similar set up or not.
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post #9 of 17 Old 01-17-2017, 05:46 PM Thread Starter
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Quote:
Originally Posted by Tspevacek View Post
Not to insult anyone but are you fully bench bleeding the master prior to installing it?
Another thing to look at is up on the top of the brake pedal to see if there is a return spring that maybe is popped off? not sure if the JK even has one.....Just a thought
The spring is inside the booster housing. There is a potential this spring broke or slid off to the side during install. It is tight quarters in there. Another possibility is the master cylinder did not line up with the brake pedal rod (I have done this before).

Otherwise it sounds like the booster if the pedal does not return.
Two boosters same issue. Took it to the dealer they said booster. Put a new one in and it still does it. They checked and said it's property installed. They think it could be a bad brake line somewhere? But since when it happens all 4 brakes are locked it dosent make sense to me? The only thing I haven't replaced is the ABS distribution block, and I don't want to throw more parts at it.
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post #10 of 17 Old 01-17-2017, 07:18 PM
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Why did you have to change all these parts out in the first place?

Do you still have the stock master and booster to see if they fix the sticking?

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post #11 of 17 Old 01-18-2017, 12:29 PM Thread Starter
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Why did you have to change all these parts out in the first place?

Do you still have the stock master and booster to see if they fix the sticking?
Originally when the problem started I thought I had a caliper hanging up. I needed new brakes anyway so I put on all new calipers and pads. After that I still had the issue. I put a new master cylinder on thinking that was the culprit. Nothing changed....At that point it was kind of intermittent. Then when it got worse I put a booster in (after the dealer told me that was the issue). Then I thought it had to be the master cylinder since it seamed to get better for a short time after the first swap out (probably a delusion by me). I have all of the new and old parts. No matter whitch if anything I put on I still have the issue. They lock up completely and the jeep will not move. Pull up on the pedal with my tie and away I go....
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post #12 of 17 Old 08-19-2019, 12:54 PM
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Originally when the problem started I thought I had a caliper hanging up. I needed new brakes anyway so I put on all new calipers and pads. After that I still had the issue. I put a new master cylinder on thinking that was the culprit. Nothing changed....At that point it was kind of intermittent. Then when it got worse I put a booster in (after the dealer told me that was the issue). Then I thought it had to be the master cylinder since it seamed to get better for a short time after the first swap out (probably a delusion by me). I have all of the new and old parts. No matter whitch if anything I put on I still have the issue. They lock up completely and the jeep will not move. Pull up on the pedal with my tie and away I go....
Timmy,

You figure this out? I am having this same exact issue now. When I apply the brakes they stay on. I can pull the pedal up with my toe and the brakes release. When there's no vacuum (engine not running) they return fine. I am assuming it's a broken return spring in the booster? I haven't had it apart. It just started happening...
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post #13 of 17 Old 10-07-2019, 09:10 AM
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Did you guys get this issues resolved? A friend has been having this exact issue with his as well. Booster/MC replaced and I believe there was a, or a few hard lines replaced. Started wit the pedal just not coming all the way up (brake lights on), now he says the brakes are sticking as well. A friend of his thought it could be the soft line, said those lines get weak and break down inside and become really soft.

I've not had this on any of the JK's I've owned, but trying to find a solution for him.
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post #14 of 17 Old 10-09-2019, 08:22 PM
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Look at the ABS system, and take a look at the wires going to your wheels for the ABS. Just because there is no ABS light does not mean it is broke
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post #15 of 17 Old 10-20-2019, 05:41 PM
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What scan tool supports a 2014 Jeep jk?
, I need to run an auto bleed on the abs module pedal is spongy after I replace calipers and rotors
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post #16 of 17 Old 11-12-2019, 08:50 PM
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Lightbulb Brake hoses?

Have you checked your brake hoses? They have been known to get weak internally and collapse, and keep the calipers pushed out.

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post #17 of 17 Old 11-13-2019, 05:35 PM
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Quote:
Originally Posted by Clasemen View Post
What scan tool supports a 2014 Jeep jk?
, I need to run an auto bleed on the abs module pedal is spongy after I replace calipers and rotors
soft pedal ≠ need to bleed the ABS module.

You probably need to re-bleed your brake system, passenger rear, driver rear, passenger front, driver front until bubbles completely stop, which can be quite a while.

The easiest thing to do is use one of these, however, you can make your own from a bug sprayer for less.

If you really want to cycle the ABS module, just go drive like an asshole on some loose gravel. It's a lot cheaper than buying a bi-directional scan tool.
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