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2007 GT3 PCCB Caliper Rebuild DIY

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2007 GT3 PCCB Caliper Rebuild DIY

 

Old 10-03-2012, 01:02 AM
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Michael Russell
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Default 2007 GT3 PCCB Caliper Rebuild DIY

Some of you may recall this thread I started RE: my brakes dragging a bit:

https://rennlist.com/forums/997-gt2-...re-a-drag.html

I decided Id rebuild one of the calipers to see if it improved the situation at all. Though the jury is still out as to whether there is actually a problem, I figured, what the hell, seems like a fun project.

The first issue was to figure out how to source the parts that were needed. The dust boots are easy, the dealer can order them no problem, and the part numbers are on the parts "fiche". Three different part numbers, for three different sized boots. Note each part number has two boots in the bag. My dealer ordered twice as many as I needed because they thought it was one boot per order. The stickier, (excuse the pun) issue is finding the inner seals. It seems there is no normal part number for them. I asked the dealer to call Porsche Motorsport, and see if they could help out. Turns out they do indeed have a rebuild kit that is made up of the inner seal and the six individual pistons. By the way, there is some confusion on the piston sizes for these calipers, (2007MY PCCB). For the record, they are 28, 30 and 32mm. The kit does not include the dustboots though, so make sure your dealer orders those separately.





Ignore those part numbers on the Brembo instruction sheet, those wont help you.

The inner seals are color coded:



The only mildly tricky part to removing the caliper is removing the brake line from it. Do yourself a favor, and buy a 10mm Flare Nut Wrench. The nut on the end of the brake line is made of brass to be sacrificial, so you don't ruin the caliper if you cross-thread it when re-attaching it. It is very easy to round off the nut using a conventional open ended wrench, so don't. Conveniently, the spring holds the brake line quite nicely! Make sure you put some sort of cap on the ed of the line, or it will weep the whole time.



With the caliper off the car I used quick release bar clamps to hold five of the six pistons in place



Then gently using compressed air, and a piece of 2x2 to make sure the piston doesn't pop out too far, I eased the piston out. The 2x2 is the perfect size, as its big enough to approximate the width of the rotor, and missing pad, but small enough to move around easily. Plus, that is wood, its soft enough not to mar anything.

Once the piston is out, use a (very) small flat head screwdriver to gently pry the boot out of the caliper



Next, with a small curved pick, remove the inner seal. It will come out easily, as it just lays in its grove.



Now, note which seal you've removed, there are three sizes, as noted above, and they are color coded. (Old on top, new on the bottom)



Now comes the fun, getting the new seal back into the caliper. First, thoroughly soak the new inner seal in brake fluid, and then work it back into the inner grove. Its not too bad on the 32mm piston, but the 28mm piston is a pain in the neck to work it back into the grove, and make sure its seated flush. There isnt a ton of room to work with, and of course I was wearing rubber gloves, (because brake fluid is just the most nasty fluid in the car), so it takes a little doing. Its not to tough, just be patient, and it will pop into place.

Next, grab the appropriate new piston, and lubricate thoroughly with brake fluid, then gently, but firmly press into the caliper by hand. Be aware that the inner seal you just put into place may be sitting slightly proud of the inner surface, and so the first time you try and press the piston in, it may wedge against the seal. Just pull the piston back out, and feel around inside making sure the seal is as flush as you can get it, then try again with the piston. You will feel a reasonable amount of resistance, but not an excessive amount, and eventually the piston will slide in.

Working by moving the clamps around, so you are always working on one piston at a time, it took about an hour to do the whole caliper.

Re-mount the caliper with fresh new caliper bolts, torque to 63ft/lbs, bleed the system, and enjoy your fresh new caliper.

For this project, it made a meaningful difference in the drag I was experiencing. Though it is still there, as on all cars it seems, it is not as much as it once was.

Hope this is useful for somebody. Let me know if I missed anything, or if anyone has a question.

Michael
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