Upgrading the WRX brakes with StopTech
The rear brakes are ready to go and sure look sweet, especially when compared to the wimpy stock brakes.
Now it’s on to the front brakes, Howard removes the front caliper.
Next, the hub nut is removed with the front rotor and the upright is removed from the strut.
The 200k plus mile wheel bearing is pressed out for replacement.
The Stoptech Aerorotor dwarfs the stock Subaru part at 328mm x 28mm vs 294mm x 24mm. Even though the Aerorotor is much bigger it weights in at the same 14 lbs due to the alloy hat.
The 4 piston ST40 Stoptech caliper is much bigger and has more pad volume that the stock 2 piston part. Even though it is much more massive, it is lighter at 8 lbs vs the stock iron calipers 11 lbs 13 oz! This is a pretty significant unsprung weight saving.


  1. You are spoiled with your dry California weather. it looks easy when everything still has factory paint. Trying to do this and the suspension bushings on a similar car here in the northeast would involve torches, penetrating oil, and lots of strong language.

  2. I need a press, lathe and mill… And as DedBull noted, less rust! Sweet upgrade, fingers crossed it will last a long time for you.

  3. Will you be tracking this car? I did 20 track days on an ’04 WRX and found the pad knockback on stock brakes and street tires substantial. A larger diameter rotor will mean larger deflections and more knockback. I was considering going BBK but then the pad knockback plus tracking a car with 60% of the weight in front made me realize it would be cheaper and more fun to do the E36 M3 route. I only miss the WRX on the track when it rains.

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