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Class A brake pads for our NA Big Brake Kits. The Good: This is the perfect track pad for extreme driving conditions. The A class compound offers excellent stopping power from a cold start up to 1300º F. Brake fade will not be an issue when using the A class compound pads. The Bad: These pads are not nice to rotors unless they are heat cycled to their upper temp range during use. This is required to transfer the boundry layer from the pad to the rotor. With out this boundry layer, the pads act as an extreame high friction pad and will quickly wear away the rotor/pad. These are not recomended for street use. The Compromise: The Rennbay big brakes kits have a easy, one clip, pad removal design. This means that pads can be easily changed out without ever having to remove the caliper from the car. The solution is to drive on our Class E or X-10 compound pads and change to the Class A pads just before your event. If you are changing tires before the event you might as well change pads while you are there. Below are the official class A specs. "A" Compound Description:
PolyMatrix "A" represents the racing brake industry's ultimate achievements in friction material for severe duty, extended high temperature braking. Originally developed for stock cars on tracks like Martinsville and Watkins Glen, this phenomenal material provides the highest friction torque values of any material used with cast iron, high strength steel, or titanium rotors.
"A" compound provides immediate brake response without warm-up. It provides excellent cold friction for qualifying laps or restarts after long caution periods. As the temperatures increase, the friction values settle in and remain consistent over the entire temperature range. Regardless of temperature, engagement is always smooth with excellent modulation characteristics at low or high pedal pressures. Release is always quick and clean. The driver can confidently go deep into the corners with consistent response and without upsetting the car. No other friction compound can deliver this kind of stopping power over such a wide temperature range under the most extreme conditions.
"A" compound is fully compatible with all cast iron, high strength steel, and titanium racing rotors. It reaches peak performance after one high temperature bedding cycle. During the bedding cycle, a boundary layer of friction material is transferred to the rotor faces. The boundary layer further improves overall stopping power and helps to reduce rotor abrasion. It also reduces engagement chatter from uneven material build up on the rotor faces and contributes to a quick and clean release. On titanium rotors, "A" compound maintains fade free performance and long wear despite the fact that the titanium rotor does not draw any appreciable amount of heat out of the pad. The uniform thermal transfer characteristics of all PolyMatrix compounds will minimize hot spotting and heat checking. Rotor life is ultimately extended over other hard or abrasive brake pad compounds. 
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