Calipers Will Not Fit Over New Rotors - 1999 WJ - Page 2 -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Calipers Will Not Fit Over New Rotors - 1999 WJ

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Unread 08-29-2009, 02:57 AM   #16
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1999 WJ 
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I hope you are using a C-clamp as they said above, otherwise its not easy to press them back. But as I said, your caliper might be in need of renovation or change, since when the pistons get stuck, they will only get worse. Have you looked at the gasket around the pistons? Is it like charcoal, then your caliper have gotten warm cause the pistons have get stuck and the brakes has been on for quite a while and giving you warped rotors.

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Unread 08-29-2009, 08:25 AM   #17
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Undo the bleeder when compressing the piston(s) makes life easier and no need to bleed the brakes.
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Unread 10-05-2009, 06:35 PM   #18
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I just unbolt the entire assembly, disconnect the line, close it off so it doesn't bleed brake fluid evreywhere, and put it in a vise.

Compresses it perfectly, and gives me time to flush all the fluid from inside the caliper. Refill with clean fluid, reattach, and rebleed. The entire process takes about 10 minutes for me now.

Before, compressing the pisons took half a freaking day.
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Unread 10-06-2009, 12:21 AM   #19
Airborne Lee
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I would never undo the bleeder and never undo the line unless I'm taking the caliper off.

JUST OPEN the cap on the reservoir and slowly press the pistons back with a clamp! You should use a shim to make the clamp cover the surface of the piston to give even pressure. I use my woodworking clamps because they are wide and give slow even pressure when I compress them with the hand lever.
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