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Old 05-02-2016, 01:08 PM   #1
T_Racer69
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Default Cadillac ATS Brembo on 2003 WRX Wagon

So this is my install of the Cadillac ATS 4-Piston Brembos on my 2003 WRX Wagon. I do some autocross and spirited driving and was looking for an upgrade to the brakes. But with current prices for used STi Brembos at 400-700 I found an alternative as mentioned in this thread with more info.

This uses GM AC Delco calipers from a Caddilac ATS with 4 piston front calipers and 2004 STi rotors for the 5x100 bolt pattern. Any STi or ATS pad will work so there are plenty of choices.

The key part in this is the adapter bracket from CTS-V Brake Swap. These mount to the WRX knuckle with slight modification. All hardware and even a tap is included on the kit.

You must drill out the top hole to 9/16 and tap the bottom mounting hole for the bracket to M14(I forget the pitch from memory). A key note, you can per the instructions through bolt the bottom bolt with an M12. If you decide to tap the hole as I did, make sure it is straight. One of mine was slightly off and I had to work everything around it as the tolerances are pretty tight on the brackets it seems.

One key difference is the steel inserts used on the mounting ears. Where the older STi Brembos are prone to stripping out over time from the metal differential of the aluminum body and steel bolt, this should help with proper antiseize, loctite, etc. Here is a picture next to an STi Brembo. The silver circle on the ATS Brembo is the mounting inserts on the ears.


I also painted mine with VHT caliper paint. I used VHT silver as the base then baked it to cure it. Then VHT Metal anodized over that for the color I wanted. I had someone local make vinyl decals in the Caddy script, English 157 FYI, for them. We'll see how it holds up. Then VHT Caliper Clear over that and baked it to cure. Not super happy as the paint is very soft. We'll see over time.


I test fit them at first to make sure my wheels would fit. Mine are Rota Tarmac 2's 17x7.5 ET48. Here is the test fit.



And finally installed and bolted up.




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Old 05-02-2016, 01:40 PM   #2
HoosierBuddy
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That looks awesome!

Phil
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Old 05-03-2016, 11:58 AM   #3
Ampdautosport
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Pretty cool nice write up!
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Old 05-03-2016, 12:03 PM   #4
T_Racer69
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Pro tip for those doing or looking to do this. Check the bleed screws. I tightened them down to what I thought was sufficient. They weeped and bubbled the VHT caliper paint, which I am not impressed with FYI.

Tracking down any real torque value was harder than I thought but I found some other sites with Brembo calipers and they seem to be around 100-140in/lbs. I tightened mine to 11 ft/lb plus a quarter turn just for good measure. I guess the upside is if they fubar they are cheap to replace.
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Old 05-03-2016, 12:29 PM   #5
SaabaruGuy
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Awesome work, that script is great!
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Old 05-03-2016, 01:42 PM   #6
16Rex
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It was brought up, in the other post, that the spacer would make it necessary to extend the wheel studs. Did you find that to be true? Seems like it would also push the wheel out, possibly creating fender clearance issues.
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Old 05-03-2016, 01:44 PM   #7
incrediboy729
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Didn't you post this on Reddit a while ago? Or maybe that was someone else...
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Old 05-03-2016, 03:34 PM   #8
T_Racer69
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The spacer is 2.5mm, .1" I see no need for extended lugs for 1/10 of an inch. LOL

I am not on Reddit so wasn't me.
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Old 05-03-2016, 03:39 PM   #9
xaviershady
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I have been following the original thread, for a while now.. very tempted to try this n my 2012 WRX, the only thing that I am concerned about is drilling the knuckle top.
Do you think there is another way other than drilling; perhaps using different size bolt and a bushing?
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Old 05-03-2016, 03:57 PM   #10
T_Racer69
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Maybe but the drilling isn't that hard. I wouldn't know where to find a bushing to step down like that unless you had something made and then I wouldn't really trust it. But it's your car. Also I am no engineer so I have no idea on if a bushing would work or not so there's that. LOL
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Old 05-03-2016, 06:32 PM   #11
binny
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Quote:
Originally Posted by 16Rex View Post
It was brought up, in the other post, that the spacer would make it necessary to extend the wheel studs. Did you find that to be true? Seems like it would also push the wheel out, possibly creating fender clearance issues.

That was only for the factory WRX wheel which would need an extra spacer (as the WRX wheel doesn't clear Brembos)
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Old 05-03-2016, 06:56 PM   #12
16Rex
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Quote:
Originally Posted by binny View Post
That was only for the factory WRX wheel which would need an extra spacer (as the WRX wheel doesn't clear Brembos)
Copy that, thanks. At 2.5mm (unless you were close already) there should be no problem.
Another question if I may, why are the older pad hardware parts required?
Did something change on the late models? If I buy used calipers do I have to throw out the existing parts and replace them with the older model parts?

One more, I may have missed it but, what brake lines did you use?

Also I read somewhere that they now offer a bolt and nut set-up to replace drilling and tapping.
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Old 05-04-2016, 09:02 AM   #13
T_Racer69
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They have always had the nut and bolt option in the instructions. You can download the instructions for free and check it out. They have a full parts list on there.

I already had ss lines. Just got new crush washers from Subaru. Same banjo bolt as the stock caliper.

As for the hardware kit I have no idea what you mean. I didn't use any old stuff.
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Old 05-04-2016, 10:16 AM   #14
16Rex
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Pads and pad hardware kits on their parts list are for 2004 -2007.
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Old 05-10-2016, 12:50 PM   #15
T_Racer69
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Sorry for the delayed response. The hardware kit is the pins and anti-rattle clips. 2004-2007 CTS Brembo pads or any STi pad, they seem to be all the same.
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