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Unread 02-10-2006, 07:54 AM   #1
SAB30
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Brake pedal stays down, won't come back up

Many of the threads I read started out with, "I did a search but couldn't..."

So...

I did a search but couldn't find anything that would help me trouble shoot why when I press the brake pedal it stays down and won't come back up unless I reach down and grab it. Any suggestions?

It just all of a sudden happened.

The brakes work well and the peddle is firm, just like it should be, but the pedal won't return after it is depressed unless I grab it with my hand and pull it back. The brakes remain activated as long as the pedal is down. When I pull the pedal back up there isn't much resistence, and once back up, the pedal stays up and the the brakes do not drag.

Any suggestions would be greatly appreciated.

Shawn

Oh, by the way it is a stock '92 YJ, 4 cyl. manual transmission

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Unread 02-10-2006, 08:08 AM   #2
naviathan
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Your master cylinder is probably gunked up. There's a spring inside the cylinder that pushes the plunger back out. If that spring for some reason gets stuck it won't return. Sounds like time for either a rebuild or a new brake master cylinder.
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Unread 02-10-2006, 08:24 AM   #3
paintguy
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I would try gravity bleeding the master through the front two calipers first, adding fluid as it runs out and then do the rear via the wheel cylinders -- this will get new fluid running through the master and maybe it will come back. Worth a try before you drop 60 bucks!
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Unread 02-10-2006, 10:46 AM   #4
Vancopbs
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Turn the car off, step on the pedal a few times to kill vacuum. Does the pedal return with the car off? Most likely the booster.

To check, start the car again, let it run 30 seconds and turn it off. Wait a minute and remove the plastic check valve the hose connects too. If you don't hear vacuum release it's your booster.
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Unread 05-29-2010, 11:54 AM   #5
92cherokeelimit
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booster? LoL, Is that part of my master cylinder? The same thing is happening to me I was just gonna replace the master cylinder is that what i should do? I dont want to rebuild it really.
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Unread 05-29-2010, 12:00 PM   #6
92cherokeelimit
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Quote:
Originally Posted by Vancopbs View Post
Turn the car off, step on the pedal a few times to kill vacuum. Does the pedal return with the car off? Most likely the booster.

To check, start the car again, let it run 30 seconds and turn it off. Wait a minute and remove the plastic check valve the hose connects too. If you don't hear vacuum release it's your booster.
Mine stays down if the jeeps on or off. I will try pushing ti a few times when its off and see what happens. The plastic check valve on what piece the master cylinder or booster? Where is the booster located. For the record i use my other foot to bring the pedal back up while im driving.. The further i press em down the worse it sticks. The pads look ok i hear the abs go of for no reason at all sometimes i think. I plan to redo the front brakes entirely but id like to get rid of this problem as the first step. I will do the caliper pads and rotors but if this just the master ill do that first. Anyone know for sure?
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Unread 05-29-2010, 03:08 PM   #7
vector6
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Quote:
Originally Posted by 92cherokeelimit View Post
Where is the booster located.
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Unread 05-29-2010, 03:35 PM   #8
MJMPC
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Does the pedal go all the way to the floor and stick?
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Unread 05-29-2010, 07:41 PM   #9
92cherokeelimit
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cool thx ......................!!!!!!!!!!!!
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Unread 05-29-2010, 08:12 PM   #10
92cherokeelimit
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no it dont go the floor and it dont stick really just moce it back up with my toe .
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Unread 05-29-2010, 10:07 PM   #11
czjeeper
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Probably your rear wheel cylinders
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Unread 05-31-2010, 08:59 PM   #12
92cherokeelimit
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Ya well my back brakes dont work really ... and it seems like they make funny sounds can i just unhook em since they dont work then ill just fix them later
?
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Unread 06-01-2010, 04:05 AM   #13
dodger889
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Quote:
Originally Posted by 92cherokeelimit View Post
Ya well my back brakes dont work really ... and it seems like they make funny sounds can i just unhook em since they dont work then ill just fix them later
?
A short answer NO! You can not disconnect the rear brakes fix them is the best thing to do.
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Unread 06-01-2010, 08:02 PM   #14
92cherokeelimit
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well i did and it seems fine its not like im gonna go far with it .But ya it still stops. And now im not wrecking my brake drum. only thing is the ebrake lights on now. lol
I dont have back brakes but i dont have the time to take that apart ill just not go far. But it seems to still stop just fine. I will fix it soon though I have never done drum brakes yet so i need to wait for my brother to help me.
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Unread 06-01-2010, 08:22 PM   #15
monkeyhouse
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Quote:
Originally Posted by 92cherokeelimit View Post
well i did and it seems fine its not like im gonna go far with it .But ya it still stops. And now im not wrecking my brake drum. only thing is the ebrake lights on now. lol
I dont have back brakes but i dont have the time to take that apart ill just not go far. But it seems to still stop just fine. I will fix it soon though I have never done drum brakes yet so i need to wait for my brother to help me.
Let me ask you a question. Why do you think they put brakes on all four wheels?

You're not just putting yourself in danger, you are risking other people's lives too if you put that thing on a public road, bad idea. Maybe you should trade that jeep in for a much safer bicycle. Oh and it's not a good idea to disconnect any of the brakes on that either, just FYI.

Come on guy, use your head.
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