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Old 03-29-2013, 03:41 PM   #1
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caliper locking up

My passenger side caliper keeps locking up. I can't get piston in without popping bleeder open. All my other cars I just took lid of master cylinder. Would it be caliper or hose collapsing? It did it yesterday and I got piston back in, ran bout hour today and it did it again.
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Old 03-29-2013, 04:53 PM   #2
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Sounds like the caliper needs to be rebuilt or replaced. May as well do them both.
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Old 03-29-2013, 04:57 PM   #3
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I replaced both of my in the rear. It's only a days job and about 70 a piece.
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Old 03-29-2013, 05:12 PM   #4
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I was just hoping someone else had same problem before. Ive never had to pop the bleeder valve to get piston in before, usually open master cylinder cap and they slide right in. The piston is rusted a little bit I've seen worse lol.

This morning and even rode hour away and came down steep mountain with lots of 25mph turns and it worked fine. Got home backed out and hit brakes BAM, stuck again.

The pedal only goes down 1/4". Recently I've replaced master cylinder, brakes and rotors.

---------- Post added at 06:12 PM ---------- Previous post was at 06:10 PM ----------

What would collasping hose do?
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Old 03-29-2013, 05:13 PM   #5
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Quote:
Originally Posted by jdavis96gt View Post
I was just hoping someone else had same problem before. Ive never had to pop the bleeder valve to get piston in before, usually open master cylinder cap and they slide right in. The piston is rusted a little bit I've seen worse lol.

This morning and even rode hour away and came down steep mountain with lots of 25mph turns and it worked fine. Got home backed out and hit brakes BAM, stuck again.

The pedal only goes down 1/4". Recently I've replaced master cylinder, brakes and rotors.
I've had a similar issue and I bought new calipers they didn't solve the problem. I'd start with replacing the hose. I haven't done so yet, but it's on my to do list
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Old 03-29-2013, 05:37 PM   #6
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I've had a similar issue and I bought new calipers they didn't solve the problem. I'd start with replacing the hose. I haven't done so yet, but it's on my to do list
Are u running it?
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Old 03-29-2013, 05:47 PM   #7
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Quote:
Originally Posted by jdavis96gt View Post
I was just hoping someone else had same problem before. Ive never had to pop the bleeder valve to get piston in before, usually open master cylinder cap and they slide right in. The piston is rusted a little bit I've seen worse lol.

This morning and even rode hour away and came down steep mountain with lots of 25mph turns and it worked fine. Got home backed out and hit brakes BAM, stuck again.

The pedal only goes down 1/4". Recently I've replaced master cylinder, brakes and rotors.

---------- Post added at 06:12 PM ---------- Previous post was at 06:10 PM ----------

What would collasping hose do?
I've had similar symptoms and it was the caliper, but who knows? It's tough to diagnose problems over the internet. Nows the time to carefully inspect all of the components. I have my doubts about the brake lines but look for anything abnormal, cracking, etc. Also check all of the brake hardware and make sure nothing is bent, missing, incorrectly installed or worn out. Scrutinize the entire system. I live in CA. Brake lines last forever out here. Lol.
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Old 03-29-2013, 05:49 PM   #8
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Quote:
Originally Posted by jdavis96gt View Post
I was just hoping someone else had same problem before. Ive never had to pop the bleeder valve to get piston in before, usually open master cylinder cap and they slide right in. The piston is rusted a little bit I've seen worse lol.

This morning and even rode hour away and came down steep mountain with lots of 25mph turns and it worked fine. Got home backed out and hit brakes BAM, stuck again.

The pedal only goes down 1/4". Recently I've replaced master cylinder, brakes and rotors.

---------- Post added at 06:12 PM ---------- Previous post was at 06:10 PM ----------

What would collasping hose do?
A collapsed hose would cause that if you can push it back with the bleeder open then it's not your caliper
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Old 03-29-2013, 05:55 PM   #9
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A collapsed hose would cause that if you can push it back with the bleeder open then it's not your caliper
That'd kinda what I was thinking on caliper. If its seized it wouldn't go back in and real easy. I just wasn't sure what the bad hose would do. Would anything else cause it?
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Old 03-29-2013, 07:05 PM   #10
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Are u running it?
I'm still driving, but its annoying though. It's also my front, but the piston pushes in easily, it just doesn't release fully, and sometimes doesn't engage soon enough. If you haven't done so already, I'd go ahead and replace the lines and calipers.
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Old 03-29-2013, 07:25 PM   #11
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I just read this thread on another site that the Guy said too much power steering fluid made his piston stick. I did notice I was about a inch over Max. Any truth to that? I'm siphoning some out tomorrow anyway.
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Old 03-30-2013, 12:11 AM   #12
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Sounds like ur slider pins need to be greased. Perhaps they r binding up.
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Old 03-30-2013, 12:54 AM   #13
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Sounds like ur slider pins need to be greased. Perhaps they r binding up.
So some white lithium grease? Or what? Should I put some around edge of piston too
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Old 03-30-2013, 08:58 AM   #14
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caliper locking up

Quote:
Originally Posted by jdavis96gt View Post
So some white lithium grease? Or what? Should I put some around edge of piston too
Yes,use the lithium grease around the pistons also. plus the slide pins. Weak brake lines will collapse causing your calipers to freeze up.
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Old 03-31-2013, 09:31 AM   #15
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Replaced hose and it didn't fix it. Bought new caliper and so far so good.
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Old 04-05-2013, 07:28 AM   #16
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New caliper still froze up. Sometimes I can drive miles and nothing and sometimes it sticks. I've put new master cylinder, caliper,brake hose. Recently put drilled&slotted rotors on.

What does portioning valve do when it goes bad? There's a box looking thing on passenger side, right up from drain plug on radiator, is that portioning valve box? Also one right under MC, so is there 2 portioning valves.
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Old 04-05-2013, 07:47 AM   #17
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That could be the problem. That valve usually regulates front to back pressure.
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Old 04-05-2013, 07:55 AM   #18
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That could be the problem. That valve usually regulates front to back pressure.
Wouldn't that lock up both front calipers. If it locks up, I take wheel off,: put c-clamp on it. Pop bleeder open for a second and its fine, for a little while.

Yesterday I bled about 1/2 qt of brake fluid out and it looked kinda greenish tint. Like real dilluted antifreeze.
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Old 04-05-2013, 08:13 AM   #19
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Sounds like you need to flush the whole system. Maybe someone put wrong fluid in at some point.
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Old 04-05-2013, 08:31 AM   #20
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Don't use white lithium grease on the slide pins. Use a brake grease that is made to withstand the proper temps experienced when the brakes get hot
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Old 04-05-2013, 10:48 AM   #21
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Sounds like you need to flush the whole system. Maybe someone put wrong fluid in at some point.
I use dot 3.
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Old 04-05-2013, 10:55 AM   #22
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Wouldn't greenish tint be from old brake lines corroding? Think I'm flushing whole system tomorrow. I've put 15 miles on it today and hasn't locked up yet.
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Old 04-05-2013, 06:19 PM   #23
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Green fluid is old fluid that has water in it. You need to flush all the old fluid out. Bleed it at each wheel until new fluid comes out. Drive a bit and repeat until clear new fluid comes out.
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Old 04-05-2013, 06:29 PM   #24
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Green fluid is old fluid that has water in it. You need to flush all the old fluid out. Bleed it at each wheel until new fluid comes out. Drive a bit and repeat until clear new fluid comes out.
Should I do it while fluid is still hot or let it cool down?
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Old 04-05-2013, 07:30 PM   #25
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I would start cold
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Old 04-05-2013, 08:29 PM   #26
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I would start cold
K thanks man
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