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Registered
Join Date: Jan 2005
Location: ChicagoLand
Posts: 1,298
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Caliper rebuild tip
You are rebuilding your calipers like I am you wrestle with getting the pistons out. The tried and true method using compressed air usually involves wrapping some rubber around the tip of the air nozzle and pray the pistons don't fly out or the air leaks out and doesn't build up enough pressure.
I came across the fact that 10mm fine thread in the caliper is the same as the thread inside my air nozzle. I screwed the brake line into the caliper and then the nozzle goes on the brake line. I get a good controled fit without any air leaking out. You have to be a bit careful not to let the weight of the compressor hose bend the brake line. I do that by flipping the hose over my shoulder so the brake line doesn't have any weight on it. Here's a couple of pics.   Happy New Year,
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'84 Carrera (recently sold  )'67 MB 250SL A few Italian motorcycles ......and a minivan for the crew |
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12-31-2006, 12:48 PM
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I had a lot of trouble getting the pistons out with my old compressor and gun. Same problems you had. Also did not want to fire the piston out like a rocket. I ended up using the high-pressure hand pump for the Fox rear suspension shock on my mountain bike. Very high pressure-- but controllable.
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John Original owner '81 911SC blackmetallic coupe. Terbatrol, SSI, M+K Gen 4, SC+ cams, A/C delete, console delete, heater backdate, 7 & 8 x 16 Fuchs with polished rims, Turbo tie rods, tensioner update, Rennline engine mount bar, Mainely Custom sump plate, new top-end, corner balance. |
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12-31-2006, 01:54 PM
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Join Date: Sep 2005
Location: Davidson NC
Posts: 622
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You can also use a grease gun. Very safe and controlled.
If you go with grease be sure you wash all the grease off. Petroleum (hydrocarbons) is not compatible with the EP rubber seals used in all brake systems. |
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12-31-2006, 02:22 PM
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Registered
Join Date: Aug 2006
Location: SE Michigan
Posts: 95
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I saw this post after the fact but thought I should include pictures of my solution for this problem. The calipers I had to start with had been out of service for roughly twenty years. Two of the rear pistons were frozen in place.
The master cylinder here was one that I replaced on my race car last season because I could not get the cap to seal to the reservoir. It was driving me crazy because brake fluid would end-up all over the place after an event. I would say that any master cylinder could work. This tool took two hours to make. The resulting caliper disassembly time was 5 minutes per caliper. Fluid fill, bleed, C-clamp move, fluid add, clamp move, and so on unit both pistons were at the end of their stroke. It worked great. Not sure when/why I will ever use this tool again so if someone needs a loan of it let me know. -Matt   
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1990 C4 |
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01-29-2007, 08:59 AM
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1981 Porsche 911SC
