A stock brake pad on a modified Subaru WRX runs out of margin faster than most owners expect, especially once power, weight from added parts, or more aggressive driving enter the picture. EBC Redstuff and Hawk HPS 5.0 are two of the more popular upgrade options for the WRX specifically, and while they get cross-shopped constantly, they are built around genuinely different priorities. This post covers what actually separates them and which one fits a given build better.
Before going further, an important fitment note. Both pads covered here are built for the 2015-2021 WRX’s steel front calipers. The STI runs Brembo calipers from the factory, which require a different pad shape entirely, so neither of these specific products fits an STI up front.
EBC Redstuff: Built Around Daily Driving Comfort
EBC Redstuff uses a NAO, non-asbestos organic, ceramic particle enhanced compound, and its defining characteristic is extremely low dust, EBC claims a 60 to 90 percent reduction compared to typical pads. It also delivers strong cold bite right from a cold start, which matters for a daily driver making its first stop of the day. The tradeoff is a longer bed-in period, EBC recommends up to 1,000 miles before the pad reaches its full performance characteristics, and it is not marketed or positioned as a track capable pad.
Hawk HPS 5.0: Built for More Aggressive Driving
Hawk HPS 5.0 uses a Ferro-Carbon compound designed specifically to increase stopping power and pedal feel without overwhelming the ABS system. Unlike Redstuff, Hawk explicitly states this pad can handle light track use, with the caveat that it is not built for sustained race sessions and will fade if pushed too hard for too long without adequate cooldown. Dust levels run higher than Redstuff, though still low compared to a dedicated track pad, and the tradeoff for the added bite and heat tolerance is a firmer, more aggressive pedal feel than a comfort-focused pad delivers.
Dust, Noise, and Daily Livability
For anyone who daily drives their WRX and cares about wheel cleanliness, Redstuff has a clear edge, its dust reduction is a genuinely differentiating feature rather than a marketing claim, and it is also engineered to run quiet. Hawk HPS 5.0 is still reasonably clean and quiet by performance pad standards, but it does not match Redstuff’s specific low-dust engineering. For a car that spends most of its time commuting with occasional spirited driving, that daily livability difference is worth weighing seriously against the performance gap between the two.
Heat Tolerance and Occasional Track Use
This is where the two pads genuinely diverge in capability, not just character. Redstuff is not rated or marketed for track use, and pushing it into that territory risks fade and reduced performance right when stopping power matters most. Hawk HPS 5.0 is explicitly built to tolerate light track use, provided the driver recognizes overheating signs and allows proper cooldown between sessions. For anyone doing the occasional track day or autocross event alongside street driving, that difference in intended use case matters more than any spec sheet number, and it is worth planning for before the first track day rather than discovering the limitation mid-session.
Making the Actual Choice
The practical decision comes down to how the car is actually driven, not which pad has the more impressive spec sheet. A WRX that is primarily a daily driver with the occasional spirited backroad run is well served by Redstuff’s low dust and strong cold bite. A WRX that regularly sees a track or autocross day, even a handful of times a year, benefits more from Hawk HPS 5.0’s higher heat tolerance and stronger bite, accepting more dust and a firmer pedal as the tradeoff. Neither pad is the objectively better choice, they are built for different driving patterns, and matching the pad to how the car is actually used matters more than chasing whichever one has the flashier marketing.
Braking is only one part of a build’s overall reliability picture under hard use. The post on how much cooling capacity a modified WRX or STI actually needs covers a related system that also matters more once a car sees regular hard use. The WRX bolt-on upgrades hub covers where a brake pad upgrade like this fits alongside other entry-level performance and reliability improvements.
Frequently Asked Questions
Does either of these pads fit the Subaru STI?
No. Both pads are built for the WRX’s steel front calipers. The STI uses Brembo calipers from the factory, which require a different pad shape entirely.
Which pad produces less brake dust?
EBC Redstuff is specifically engineered for very low dust output, reducing it significantly compared to typical pads. Hawk HPS 5.0 produces more dust than Redstuff, though still less than a dedicated track pad.
Can either of these pads handle a track day?
Hawk HPS 5.0 is explicitly rated for light track use with proper cooldown between sessions, but not sustained race conditions. EBC Redstuff is not marketed or positioned as a track capable pad.
How long does it take for EBC Redstuff to reach full performance?
EBC recommends up to 1,000 miles of bed-in before the pad reaches its full performance characteristics, longer than many other pad compounds require.
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