Subaru Enthusiasts Car Club of the Sierras - View Single Post

ryan4601 · 2010-04-23, 07:39 PM

I did the fastwrx.com rear brembo upgrade on my 04 wrx. The kit allows for you to have the 319mm vented rear rotor size which is larger than the 290mm vented rear from the 06/07 wrx. It is a straight swap once you get the kit and have the calipers and pads. Rear backing plates will need to go, but a drill will handle that. Parking brake will work fine with the rotors. If you have stainless steel brake lines in the rear those will work fine with the brembos, but I would recommend getting new copper washers for the banjo bolt. Only other thing to watch out for is depending on your year wrx, your master cylinder bore size may be too small. When I say "too small" it doesn't mean that it won't work, but it may not be optimal. From what I read, pedal feel with the smaller master cylinder is not good with the brembos. If i remember correctly certain year wrxs (06-current? don't quote me on that) have a 1" MC bore while the 02-05 has the 1 1/16 MC bore which is the same as the sti. You can check you MC bore size by using a small mirror and taking a look under the MC in your engine bay. Let me know if you have any further questions.
Ryan

2010-04-23, 07:39 PM	#9
ryan4601 EJ22 Join Date: Feb 2004 Posts: 244 Car: 2004 wrx	I did the fastwrx.com rear brembo upgrade on my 04 wrx. The kit allows for you to have the 319mm vented rear rotor size which is larger than the 290mm vented rear from the 06/07 wrx. It is a straight swap once you get the kit and have the calipers and pads. Rear backing plates will need to go, but a drill will handle that. Parking brake will work fine with the rotors. If you have stainless steel brake lines in the rear those will work fine with the brembos, but I would recommend getting new copper washers for the banjo bolt. Only other thing to watch out for is depending on your year wrx, your master cylinder bore size may be too small. When I say "too small" it doesn't mean that it won't work, but it may not be optimal. From what I read, pedal feel with the smaller master cylinder is not good with the brembos. If i remember correctly certain year wrxs (06-current? don't quote me on that) have a 1" MC bore while the 02-05 has the 1 1/16 MC bore which is the same as the sti. You can check you MC bore size by using a small mirror and taking a look under the MC in your engine bay. Let me know if you have any further questions. Ryan Last edited by ryan4601; 2010-04-23 at 07:47 PM.