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Porterfield Racing Brake Pads — Race Proven Performance
Porterfield AP31
Image of what an axle set is. 2 pads per wheel, 2 wheels equal axle set

Porterfield Part # AP31 R-4

Porterfield AP31 Brake Pads

$261.95 CAD
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Canadian since 2005Mississauga, Ontario
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Porterfield Brakes are race-bred friction designed and proven on the track. Each set is precision-cut from premium friction material and developed for high-temperature durability, fade resistance, and consistent pedal feel.

Available Compound Options for this Fitment:

  • R-4 — The original road racing compound that is very rotor friendly and easy to modulate. Medium friction with a 0–1200°F temperature range; optimum 350°F–900°F. Not for street use.
  • R4-E — The Endurance compound. Slightly lower friction than the R-4 but designed to wear longer for endurance races (4–6 hour). Characteristics are otherwise much the same as R-4. Not for street use.
  • R4-1 — The Vintage compound. Designed for vehicles that struggle to keep heat in the pads. Best when temps are under 600°F and peak temps stay below 1000°F. Also popular as an autocross pad. Not for street use.
  • R4-S — The performance street pad. Lowest dust and squeal of any street pad in the Porterfield line, very rotor friendly, and lasts as long as (or slightly longer than) stock pads. Not for track use. Not for use with CCM discs.

Vehicle Fitment

Porterfield AP31 brake pad Axle Set of 4 Pieces FRONT

Make Vehicle Applications
Alfa Romeo 77-77 Alfetta, 66-68 Duetto 1600 w/ATE, 64-68 Guilia w/ATE, 64-68 Giulia Sprint w/ATE, 64-66 GTC w/ATE, 65-68 GTV w/ATE, 1964 GTZ w/ATE, 78-79 Sport, 65 & 67 TZ w/ATE
Audi 70-72 100 w/Manual Trans, 69-72 Super 90
BMW 61-65 1500, 63-68 1800, 67-69 2002, 1964 1800TI
Opel 71-73 1900, 68-72 Kadett, 71-73 Manta, 68-70 Opel
Porsche 63-65 356 w/Disc, 65-68 911, 69-73 911 M Caliper w/Solid Rotors, 65-69 912, 70-71 914/4
Saab 69-74 99 REAR FOR PORSCHE : 69-77 911 S Caliper, 75-77 911 A Caliper, 78-89 911,75-77 911 Turbo
Maserati 82-90 425/428/430/Biturbo/Zagato Spider
Ferrari 71-74 Dino 246, 74-85 308
Mercedes Benz 74-83 240D, 66-73 250 series, 67-80 280Series, 86-91 560SEL
Volvo 67-74 142,144,145, 84-92 740,745,760, 98-04 C70, 98-00 S70, 98-00 V70 FRONT &/or REAR FOR PORSCHE : 69-74 911 “M” Caliper with Vented Rotors, 1969 912, 1976 912 M Caliper, 70-72 914/6 D31, AP31, R31.15, PFC 0031, Pagid 4304, HB172.595, FCP2

All Porterfield Brakes products carry the manufacturer's standard warranty. Race compounds are not for street use.

Free Canadian shipping on qualifying orders $399+, with no duties or brokerage. Special order and made-to-order items can't be cancelled or refunded once ordered. Oversized items may have a handling fee depending on your location; pickup in Mississauga has no fee.

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