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Old 04-05-2010, 02:32 PM   #1
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Brake help asap!

I'm doing my breaks, pass side is done went fine. I'm on the drivers side, I took off the caliper and old pads and I was using a c-clamp to push the piston back in and break fluid started leaking from the reservoir it overflowed. Being the idiot I am I pushed the brake pedal and the piston fully extended out. I tried using the clamp to get it back in but it wont go. Need help quick!! how do I get it back in?


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Old 04-05-2010, 02:46 PM   #2
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wow, if you're lucky you can get it back in. open up the bleeder on the back of the caliper so the pressure lets out that builds up when you try to push the piston back in.

i assume i don't have to talk about how many things you did wrong here right? obviously your brake fluid was too full, and thank places like jiffy lube for topping of your brake fluid like idiots. there's no reason to add brake fluid, ever, unless you opened the system to replace a hose, caliper, wheel cylinder etc..

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Old 04-05-2010, 02:54 PM   #3
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wow, if you're lucky you can get it back in. open up the bleeder on the back of the caliper so the pressure lets out that builds up when you try to push the piston back in.
I agree...open the bleeder and let us know if that works cuz I'm curious now.
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Old 04-05-2010, 02:55 PM   #4
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Nope, bleeder open and cap off the reservoir it won't budge
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Old 04-05-2010, 02:56 PM   #5
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Take the other side off the rotor. If it doesn't go in... get a new cylinder
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Old 04-05-2010, 02:56 PM   #6
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and open your brake fluid cap under the hood.
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Old 04-05-2010, 02:58 PM   #7
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A new cylinder? It can be ruined by hitting the brake when it's off the rotor?
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Old 04-05-2010, 03:00 PM   #8
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Never add fluid to your resovoir when you notice it low,it is telling you that your pistons are out too far,unless you are flushing your system never add fluid.When you go to replace pads it will return to its proper capacity because you are shoving the piston back in.If the caliper is leaking then you've went too far out and it is leaking past the seal.Tear it apart clean everything,repack it and maybe,just maybe it will seal.Probably need a new seal kit now sorry to say.When you are applying brake without resistance put a block of wood against the piston and caliper or it will shove the piston out too far.Don't panic,its really not that big of deal.
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Old 04-05-2010, 03:01 PM   #9
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Nope, bleeder open and cap off the reservoir it won't budge
I wonder how much pressure you're putting on it trying to get it back in....i usually put something flat over the caliper piston so that I can get a good, sturdy, flat surface for tightening down that c-clamp. Seems the pressure would have to release somewhere in order to get that caliper piston back in. Maybe someone else will chime in and give some more insight. I always do my brakes, and others in my family also, so I'm wondering how to fix your problem....u know, in case I ever go hit the brake pedal during a change.
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Old 04-05-2010, 03:03 PM   #10
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bato, I had mine like that one time.. I was driving and I hit the brake and one side would go in... Noticed my calibers were bad and I could hardly even take the caliber off the rotor they were out so far but I finally got it out and I couldn't move them in at all... I took both off and one went in with a c clamp while the other went out, I kept switching sides then all of a sudden they were fixed... Idk what went wrong but it happened again and I just decided to get new calibers. Must easier. Go to autozone.
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Old 04-05-2010, 03:05 PM   #11
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Sounds like your piston is off set in bore.Put a block of wood between piston and caliper,take out bleeder and pop it with a little air,clean everything in brake fluid,sand the piston wear marks and put her back together,hope that she seals.
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Old 04-05-2010, 03:05 PM   #12
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Never add fluid to your resovoir when you notice it low,it is telling you that your pistons are out too far,unless you are flushing your system never add fluid.When you go to replace pads it will return to its proper capacity because you are shoving the piston back in.If the caliper is leaking then you've went too far out and it is leaking past the seal.Tear it apart clean everything,repack it and maybe,just maybe it will seal.Probably need a new seal kit now sorry to say.When you are applying brake without resistance put a block of wood against the piston and caliper or it will shove the piston out too far.Don't panic,its really not that big of deal.
Or there could be an undetected leak...like I just had coming from my rear wheel cylinder, which was causing my fluid level to go down. Was only leaking I guess when I was driving and hitting the brake because I never saw fluid on my driveway. Just saying, dont assume low fluid only means its time for new pads and accidentaly miss a system leak.
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Old 04-05-2010, 03:09 PM   #13
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It is always best to do one side at a time,when you apply pressure to one caliper,the other side will extend if there is no resistence.Leave it one the rotor be patient and continue to apply more pressure,use a welder's clamp and old pad against the piston.
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Old 04-05-2010, 03:10 PM   #14
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idk if this will help or not but here is my thread when I had the brake problem...

http://www.wranglerforum.com/f5/fron...elp-44566.html
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Old 04-05-2010, 03:11 PM   #15
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Or there could be an undetected leak...like I just had coming from my rear wheel cylinder, which was causing my fluid level to go down. Was only leaking I guess when I was driving and hitting the brake because I never saw fluid on my driveway. Just saying, dont assume low fluid only means its time for new pads and accidentaly miss a system leak.
Ofcourse look for leaks,but most the time,its just the pads are worn and the pistons are too far out.Leaks are easily detected.
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Old 04-05-2010, 03:13 PM   #16
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tried c-clamp and block of wood (all I have) and it will not budge.
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Old 04-05-2010, 03:14 PM   #17
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you are prob goin to have to get a caliper rebuild kit, it has the o ring and new boot......
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Old 04-05-2010, 03:16 PM   #18
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I am saying that if your resovoir is low,crawl under the machine and look at all four corners,don't just add fluid-there is a reason for loss of fluid,pads shot or a leak.One drop of brake fluid will turn into a big wet spot somewhere.
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Old 04-05-2010, 03:16 PM   #19
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Or there could be an undetected leak...like I just had coming from my rear wheel cylinder, which was causing my fluid level to go down. Was only leaking I guess when I was driving and hitting the brake because I never saw fluid on my driveway. Just saying, dont assume low fluid only means its time for new pads and accidentaly miss a system leak.
Looking at the inside aspect of the backing plates would tell you if your wheel cylinders are leaking...they'll look wet. - Baja beat me to it.

Great rule of thumb - never add brake fluid, only replace it. (yes by flushing the system).

OP. the recommendations seen in this thread should get it back together, if it has issues after this you might be well served to buy a rebuilt unit (its not time/cost effective to rebuild it yourself IMO). or maybe I'm just lazy.
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Old 04-05-2010, 03:18 PM   #20
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tried c-clamp and block of wood (all I have) and it will not budge.
Its not returning straight in bore don't force it or you will be honing the caliper out or replacing it altogether.Shove some air into the bleeder hole,and take out your piston.RtR time.Rebuild or replace.
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Old 04-05-2010, 03:18 PM   #21
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Mr Carcrazy is one smart mofo.
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Old 04-05-2010, 03:23 PM   #22
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Baja and Mr Carcrazy, I definitely wasn't disagreeing with you guys....I had just been dealing with this problem over the last week so it was fresh in my head about the lack of fluid due to the (slow) leak.
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Old 04-05-2010, 03:29 PM   #23
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I'm sorry to interrupt, but chrisb0108, your avatar picture is like the best picture. That's awesome.
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Old 04-05-2010, 03:42 PM   #24
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Haha, thanks. I have to agree with you on that!! He gets it honestly. When I get home from work or wherever, all I hear is "Sit in daddy's jeep" until we go out and chill in it for a while. He loves it almost as much as I do.
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Old 04-05-2010, 03:48 PM   #25
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Ok this is where I'm at. My fluid was not low, when I went to push the piston in it overflowed from the reservoir under the hood. I don't know why but I pushed the brake pedal thinking it would suck some fluid back down and forgot the caliper wasn't on the rotor and had no pads in it. I made a huge mistake, thank god I have another vehicle to drive. I'm going to take this as a learning experience and fix my mistake I just need some guidance. There are no leaks either, I have never had to add fluid. I think originally I just pushed it to far thats why is overflowed.

This is where I'm at, I took the piston out of the calliper completely and drained the fluid that was inside the hole where the piston goes. Now what? Where do I start? Should I try to realign it and hope it will push in this time (maybe it wasnt aligned before) what should I do?

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Old 04-05-2010, 03:50 PM   #26
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Hope my kiddo's will share the obsession with me!

That's too awesome!

I've been down this road 100's of times. This is the one area I'm really experienced in. I'm not that smart. I've just fixed a lot of F'ed up vehicles.

Yes, I'd try that. might as well...I'm not a fan of rebuilding calipers if it can be avoided...as mentioned earlier I'm too lazy for that. I just buy them rebuilt. (back when I was doing it for a living we learned that sometimes weird stuff happens and buying one that has already been rebuilt is faster/cheaper on our end than doing the labor and possibly running into an issue when rebuilding a caliper.

If you can get it back together, and it doesn't leak I'd call it a quick/easy lesson. if you can get a rebuild kit for a lot less than a rebuilt caliper you can try that route. if slapping it back together doesn't work.
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Old 04-05-2010, 03:52 PM   #27
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Ok this is where I'm at. My fluid was not low, when I went to push the piston in it overflowed from the reservoir under the hood. I don't know why but I pushed the brake pedal thinking it would suck some fluid back down and forgot the caliper wasn't on the rotor and had no pads in it. I made a huge mistake, thank god I have another vehicle to drive. I'm going to take this as a learning experience and fix my mistake I just need some guidance.

This is where I'm at, I took the piston out of the calliper completely and drained the fluid that was inside the hole where the piston goes. Now what? Where do I start? Should I try to realign it and hope it will push in this time (maybe it wasnt aligned before) what should I do?

You should probably get a rebuild kit before you put it back together..
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Old 04-05-2010, 03:59 PM   #28
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I can get a new calliper for $40 from rock auto. Now that the fluid reservoir/cylinder under the hood is about empty should it be easier to get the piston back in? What is involved in a rebuild kit, just a seal?
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Old 04-05-2010, 04:02 PM   #29
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I can get a new calliper for $40 from rock auto. Now that the fluid reservoir/cylinder under the hood is about empty should it be easier to get the piston back in? What is involved in a rebuild kit, just a seal?
Pretty much.. If you go up and look at my forum, a fellow forumer () posted a video and it shows you how to do it and how much, repair kit is about $8-$10.. Hope that helps...
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Old 04-05-2010, 04:03 PM   #30
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