Porterfield R4-1 Vintage Racing Compound Disc Brake Pads for 4 Piston Kelsey Hayes Calipers (1965-1966) Mustang



Set of 4 front brake pads for any early Ford with the four piston Kelsey Hayes front disc brake calipers.

65-66 Mustang w/Front Discs

67 Mustang w/Front Discs exc. 428 V8

67 Mustang 428 V8 w/Front Discs


67 Cougar 289 V8 w/Front Discs/390 V8 w/Front Discs

This high friction racing material has grown to be a very popular choice for drivers who need the highest possible friction with a low pad temperature. Developed and tested in the vintage racing community the R4-1 gives an average coefficient of friction of .56 with peak levels up to .600. Having tremendous stopping power, the R4-1 pad material can reach upwards of .5 friction level when pad temperature is a very low 200ºF . Drivers can still have a high friction brake pad without worry of the pad becoming too cold to be effective when the car is driven only moderately. For use when pad temperatures are under 600ºF and peak temperatures are not over 1000ºF. Widely used on Vintage GT and formula cars the R4-1 has gained great popularity as an excellent auto-cross, off-road and rally-cross pad material. Great modulation, consistent pedal feedback and the same rotor friendliness as our other carbon kevlar compounds.