RSH42 Compound Overview PAGID Blue RS42 are from the RS line of all around racing brake pads. They are a medium friction coefficient racing compound with medium initial bite and good cold friction. RS42 pads are manufactured of a low metallic resin bonded material containing steel and acrylic fibers. They operate in a wide operating temperature range and are very stable over that wide temperature range. RS42 pads offer excellent pedal feel and inspire confidence in extreme braking situations. They offer lower disc wear rates and are fade resistant up to a temperature of 650°C (1,202°F). Applications include: Vintage Rally Racing, Formula Racing and Touring Cars.