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Brake Caliper Identification

steyning

steyning

New member
I need to replace the seized O/S/F brake caliper on my 1980 924 Turbo, for a useable second hand one, until funds allow all four original calipers to be properly refurbished in one job lot.

Is the front brake caliper specific to this year and Turbo model, or will ones from other 924's of the same year be interchangeable? Thanks in anticipation.
 
As far as I know all the 924 turbos use early 928 calipers. They are not the same as normally aspirated calipers because the turbo runs ventilated discs, which are wider, with a commensurate increase in the width of a cliper.
 
Actually refurbing your own caliper is not that time consuming. I did my 924 lux in 2004 and a seal kit for a pair of calipers was about £16.00. They are now for example £14.50 per side from Porscheshop. Unless you are very unlucky the piston does not usually sieze in the caliper but the rubber seal , now 27 years old is probaly as hard as nails an does not flex. This makes the piston very lazy as it forces its way through the stiff seal, and of course as the seal doesn't flex, there is no retracting effect so the piston binds on. Take the caliper off which you will do anyway, and dismantle it. Blow the piston out using a footpump attaced to a convenient point. I think I blanked off the pipe fitting and pressurised it through the nipple. Clean everthing out with methylated spirit. Remove the rubber seal. I used jewellers rouge on the end of my dremel to re-polish the bores and remove the litlle bit of light rust from the piston. Clean everthing out with meths again, then again and set aside to dry. Lubricate the new seal with brake fluid and put it in. Lubricate it again and then squeeze the piston in using the jaws of a vice to press it in square. re-assemble and refit then bleed the brakes. You will be amazed at the difference. For a little time and a relativley small outlay you will stay mobile until you can afford the £94 plus vat odd for some exchange calipers.
 
If the [FONT=arial"]refurbishment works then why do the units then need replacing with exchange units ? I suspect that the only difference will be the exchange units will have had new seals "professionally" refitted.
Steve[FONT=verdana,geneva"]
 
All the caliper frames will be nicely plated, they will have new pistons and the ptfe slide will have been replaced during reassembly. When I do my turbo ones I think I am going to rotary wire brush them and paint them with red high temperature paint.

 
Second the comment about refurbing the calipers. I had a 25 year old 944 Lux set that I thought had seized solid. Very little piston corrosion when I got it apart. Seals from Berlyn (cheapest I found) installed after I'd painted them and they were as good as new. Huge difference in braking performance. Also got new bleed valves for them:
http://www.porscheclubgbforum.com/tm.asp?m=338569&mpage=1&key=񒪉
 
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