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1988 Porsche 911 frozen caliper HELP!
Hi All,
I just started rebuilding the brake calipers on my 1988 Porsche 911 Carrera. I have done many different brakes in the past but I have not come up against a totally stuck piston in the caliper assy. I first tried 30 psi and one side came out to the wood block that I have there. The other side would not move. I put it back into the car and bled the caliper but only the one side will move again. I put an old pad on the moving side and not the frozen side is still stuck. I took it back out and it is now on my bench with the frozen side soaking in Kroil & P.B. Blaster combo running around the stuck piston. Is there anything else that I can do? I feel that all of my wheels will be close to this as, I bought the car new and I have only driven it 15k. The Porsche gods are angry at me. I have the kits for all 4 wheels and 4 new rubber brake hoses. Can I get some help help please? I do not want to go the route of the grease gun as that will clog up the whole assy and I will have to separate it to clean and then find a gasket kit. The penetrating oil will bleed out. Thanks Jack 1988 Porsche Carrera |
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07-08-2010, 04:18 PM
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Join Date: Oct 2004
Posts: 15,612
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That car is like a time capsule. It probably has a ton of issues to work through. You might donate that caliper to the natural history museum as a fossil. If a LITTLE BIT of heat doesn't get it, use it as a core for a new caliper.
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07-08-2010, 06:39 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Let me guess... the piston that didn't come out was on the outside? Reinsert the other piston, hold it in place with a clamp, and use air pressure to blow the stuck piston out...
JB
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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07-08-2010, 07:10 PM
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it might be safer to just use the master cylinder and your foot, while using a small c-clamp on the unfrozen side.
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07-08-2010, 07:21 PM
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I'm here to cause trouble
Join Date: Mar 2005
Location: CA
Posts: 935
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Good point - the piston can shoot out like a bullet....
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'86 Carrera Cabriolet '73 911T Sporto (RIP) '90 Miata LeMons Contender! '71 Datsun 510 (RIP) '67 Fiat 124 Sedan (RIP) '72 Ford Pinto (RIP) '62 Plymouth Valiant '60 Ford Galaxy 500 (RIP) |
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07-08-2010, 08:41 PM
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Push the stuck piston in and try it again.
Mine were stuck but would push in and after several tries was able to get them to pop out with compressed air.
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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07-09-2010, 05:46 AM
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I had to use 100psi to pop mine out. Wear safety glasses, and have a thick piece of wood inside the caliper to catch the piston. If your fingers are in the way, you will not get them back, so be very, very careful.
The on-the-car method is certainly safer, and the 1000+ psi your brake system can provide should get any piston out ....
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'88 Coupe Lagoon Green "D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen" "We must not allow a Mineshaft Gap!" |
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07-09-2010, 06:30 AM
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Join Date: Sep 2004
Location: Eastern shore MD (Harmony)
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I had the same problem on the rear, outside and just replaced it with a rebuilt on from Autozone of all places. Has been work well for a couple of years. Good luck. Steve
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Steve 1970 911T SOLD 1989 3.2 Carrera 2013 991 Carrera S |
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07-09-2010, 06:54 AM
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Blackie
1979 Porsche 911SC
1988 Porsche 911 3.2
