Brake caliper locked up! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-31-2004, 01:26 PM Thread Starter
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Brake caliper locked up!

I took my CJ out for it's trial run yeasterday and found two things wrong! The first is my shock mounts need to be changed and the second was that my left front calliper was dragging on the rotor. Caused a lot of heat! I am hoping that I did not warp my rotor. What would cause only one caliper to lock up? This is on a Waggie d-44 that previously worked fine. I did just swap in a power brake setup from a Wrangler, but I would assume that if this were the culprit and was out of adjustment, both brakes would drag. I re-bled the lines and it locked up again. Any thoughts?
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post #2 of (permalink) Old 05-31-2004, 01:41 PM
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Re: Brake caliper locked up!

1. Pistons and seals in calipers wear.
2. First be sure the flex hose isn't collapsing.
3. If that's good,
4. You've got three choices:[*]A rebuild kit[*]A new caliper[*]A rebuilt caliper
5. Usually a rebuilt caliper is the least expensive alternative.
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post #3 of (permalink) Old 06-01-2004, 06:48 AM
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Re: Brake caliper locked up!

The first thing I would do would be to change the flex hose, like leve said. When they get old (if yours sat without fluid in it, while you did the swap... that would make it old) they can flex under the pressure, and when you let off the breaks, the negitive pressure can suck them in. Trapping the fluid in the piston, and keeping the break ingauged.
This same problem has happened to me twice. Both times, new break lines fixed the prob.
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post #4 of (permalink) Old 06-01-2004, 09:48 PM
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Re: Brake caliper locked up!

I got a rebuild kit($3?). I had never rebuilt one before and hardly knew how a caliper worked but thanks to the confidence this board gave me I rebuilt both calipers. The rebuild kit comes with the two seals you need. Used compressed air to remove piston, then cleaned the piston well. I could see if the piston was dirty or seal not in good shape the piston might hang up. The most important advice I can give you from experience is if you get a rebuilt caliper or a new one or a used one or whatever, make sure you get the correct banjo bolts or save your old ones. Those banjo bolts are like looking for the holy grail.
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