 Stuck front caliper pistons |
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| steuspeed |
 May 11 2019, 08:25 PM
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#1
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Senior Member  Group: Members Posts: 1,006 Joined: 12-July 11 From: Portland, Oregon Member No.: 13,308 Region Association: Pacific Northwest  |
Heard some metal grinding so I took off the front caliper and the pads are gone. The pistons are maxed out and they won't go back in even with a C-clamp. I cracked the bleeder valves and no help. Any ideas out there?
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| Chi-town |
May 11 2019, 08:39 PM
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#2
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Senior Member Group: Members Posts: 850 Joined: 31-August 18 From: Disneyland Member No.: 22,446 Region Association: Southern California |
Pop them all the way out and inspect for corrosion
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| Dave_Darling |
May 11 2019, 10:08 PM
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#3
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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PMB Performance. Send them in and get them rebuilt.
--DD |
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| porschetub |
May 12 2019, 12:01 AM
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#4
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Advanced Member Group: Members Posts: 4,701 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
The pistons have stuck in the caliper bores,that will do it.
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| sixnotfour |
May 12 2019, 07:11 AM
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#5
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914 Wizard Group: Members Posts: 10,432 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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Round file it,, lottsa parts in the portland area..
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| r_towle |
May 12 2019, 08:15 AM
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#6
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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you should be able to wrap the top area with a few rounds of duct tape, then use vice grips to get the piston to turn back and forth just a little bit to free it up.
You can also use a high pressure air hose through the inlet and blow the piston out...but it may not work with too much corrosion. Try not to put teeth marks in the piston, but if you must just grab the top 1/8 that never goes into the cylinder area. rich |
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| Superhawk996 |
May 12 2019, 08:31 AM
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#7
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914 Guru Group: Members Posts: 5,827 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(r_towle @ May 12 2019, 10:15 AM)  you should be able to wrap the top area with a few rounds of duct tape, then use vice grips to get the piston to turn back and forth just a little bit to free it up. You can also use a high pressure air hose through the inlet and blow the piston out...but it may not work with too much corrosion. Try not to put teeth marks in the piston, but if you must just grab the top 1/8 that never goes into the cylinder area. rich Please try to avoid the vice grips -- only as absolute last resort. If high pressure air won't blow them out they are in really bad shape anyway and then at that point, you're probably in for new calipers. I've never found the duct tape thing to be that much help it's far too soft. Thin 0.040 - 0.060 copper strip will work much better to prevent vice grip jaw teeth markings and metal deformation on the top of the piston. |
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| r_towle |
May 12 2019, 08:33 AM
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#8
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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QUOTE(Superhawk996 @ May 12 2019, 09:31 AM) QUOTE(r_towle @ May 12 2019, 10:15 AM) you should be able to wrap the top area with a few rounds of duct tape, then use vice grips to get the piston to turn back and forth just a little bit to free it up. You can also use a high pressure air hose through the inlet and blow the piston out...but it may not work with too much corrosion. Try not to put teeth marks in the piston, but if you must just grab the top 1/8 that never goes into the cylinder area. rich Please try to avoid the vice grips -- only as absolute last resort. If high pressure air won't blow them out they are in really bad shape anyway and then at that point, you're probably in for new calipers. I've never found the duct tape thing to be that much help it's far too soft. Thin 0.040 - 0.060 copper strip will work much better to prevent vice jaw teeth markings and metal deformation. Its all in the technique I guess. (IMG:style_emoticons/default/smile.gif) YMMV. |
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