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Front Caliper question

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Old Aug 10, 2015 | 04:10 PM
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Default Front Caliper question

This was the first time removing the front calipers on my 77 and of course.. I loosened up the wrong 2 bolts on one of the calipers and brake fluid started pouring out of the seam between the 2 caliper halves. Stupid.. I know. Anyway... I tightened the bolts back up but the caliper is still leaking fluid. I assume I need to replace the seals now? Is this common? I am rebuilding the entire front end of my car so I removed the caliper and its on the bench. My calipers are only 6 months old and were installed by the previous owner along with new flex lines. I want to replace them with braided hoses.
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Old Aug 10, 2015 | 04:31 PM
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you just need to replace a little o-ring or two
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Old Aug 10, 2015 | 04:34 PM
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do you realize those bolts have to be tightened to 130 ft/lbs?
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Old Aug 10, 2015 | 05:17 PM
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If the calipers are old, I would just replace them for $70 at advanced auto or auto zone. Piece of mind and headache gone.
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Old Aug 10, 2015 | 05:34 PM
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You must be very strong, many times it takes a breaker bar with a pipe on the end to loosen the correct bolts.

Agreed, just open the caliper again and install a new "O" ring and seals.
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Old Aug 11, 2015 | 11:58 PM
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Originally Posted by jgcable
This was the first time removing the front calipers on my 77 and of course.. I loosened up the wrong 2 bolts on one of the calipers and brake fluid started pouring out of the seam between the 2 caliper halves. Stupid.. I know. Anyway... I tightened the bolts back up but the caliper is still leaking fluid. I assume I need to replace the seals now? Is this common? I am rebuilding the entire front end of my car so I removed the caliper and its on the bench. My calipers are only 6 months old and were installed by the previous owner along with new flex lines. I want to replace them with braided hoses.
Assuming that 1) the calipers are as new as you mentioned, and 2) that none of the pistons have popped out of their bores or were leaking beforehand, I would just separate the two caliper halves on the workbench and install two new "o-ring" seals (the small ones depicted in the picture below) on the caliper half with the depression around the holes.



Then carefully place the other half of the caliper on top of it and reinstall the two bolts that hold the caliper together. Snug the bolts, but don't bother to torque them until the caliper is mounted on the spindle when it will be much easier to torque them to the proper amount. Be very careful to not introduce any dirt or debris into the open caliper.

As long as none of the pistons popped from their bores and none of them were previously leaking, there should be no reason to replace any other seals. Of course, if any of the pistons are leaking (or you would like to switch them to "O-Ring" seals), this would be a good time to replace the piston seals and dust covers with new ones.

Good luck... GUSTO
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Old Aug 12, 2015 | 07:45 AM
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I bought the kit to rebuild both of my rear leaking calipers for $15 at autozone last year... been fine ever since. (They were "New" when I bought the car but failed while sitting over the winter.) I had a pad "fall out" of my front caliper and bind it which damaged the wall.(PO used incorrect cotter pin).. I found a nice chinese clone replacement at autozone as mentioned. It seemed to have stainless pistons as well as sleeves.

Last edited by augiedoggy; Aug 12, 2015 at 07:51 AM.
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