Pad review /// STREET + TRACK
Porterfield R4-S
A cult favorite: strong cold bite and smooth release, brilliant for autocross and canyon roads.
Spec sheet
Compound familyCarbon-kevlar
Duty classStreet + track
Operating window0–580 °C
Street useYes
Typical price$$$$ · $80–140 / axle
Operating window
0°C300600900°C
Works from 0°C to 580°C
Character ratings
Bite / stopping power7
Fade resistance6
Cold performance8
Quietness7
Low dust5
Pad life6
Rotor friendliness8
The verdict
Best for: Autocrossers and spirited street drivers wanting instant cold response.
The trade-off: Heat ceiling sits below true track pads — long sessions will find it.
Reading the numbers
Standout traits: cold performance (8/10), rotor friendliness (8/10).
No outright weak axis for its intended duty.
Ratings are brakepadfinder.com's editorial synthesis of manufacturer specs and long-term community consensus. Character guidance, not lab data.
Alternatives in the same class
Is this your pad?
Confirm exact fitment for your year, model and trim in the manufacturer's catalog — then bed them in properly.