Like most people with WRXs, I recently acquired some Brembos and I decided to rebuild them just for piece of mind. A good number of people split the calipers apart but I'm not a fan of that methods for a couple of reasons:
1. The bolt are stretch bolts and I rather not re-use them
2. There are no torque specs for those bolts
3. Brembo doesn't offer an o-ring replacement for the calipers
4. Even the service manual rebuilds them as I'm about to show
That being said, I'm sure splitting the calipers isn't going to cause any catastrophic damage, but I'm just uncomfortable with doing and there's plenty of space with the caliper being together to do the work.
The first step was to figure out which rebuild kit to buy. Mach V (Fastwrx.com) offers the Brembo Rebuild Kit
and their own Mach V Rebuild Kit
. I elected to use the latter, because it was cheaper and the quality seemed pretty good. Keep in mind if you buy the Brembo kit you only need to buy ONE for BOTH calipers, with the Mach V kit you need to TWO kits to do BOTH calipers.
Here are some pictures comparing the two:
Brembo kit is on top here
Brembo on the left. You can tell it has a smoother finish
Thickness is the same as far as I can tell
Dust boots. Brembo on the left
The rear kit. Brembo on top. The rear dust boots are gray instead of black.
Next up...the actual rebuilding.