Ford Sierra Cosworth 2WD Brake Kit 17 – Pro Race 1 4 pot caliper – 330x28mm by CompBrake – CompBrakes individual HIGH PERFORMANCE SYSTEMS have been developed with racers for racers. Tested on racing circuits that achieved confidence to outbrake most others! Compbrake racing Braking Systems offer significant advantages over standard original manufacturer’s systems, with performance far beyond what’s simply known as "big brakes". CompBrake brake solution upgrades are a popular performance enhancement. Whether it’s to improve the appearance of your vehicle after installing attractive alloy wheels to improve stopping ability on the track or to gain precious seconds in competition.". proven at Nurnburg and cicuits through out Britain.