On July 15th at Grattan Raceway Park a protest was filed in the Heavyweight Superstock class of the Bridgestone/WERA National Endurance Series. The protest was filed by Team Velocity Racing against Arnchu Racing and 5150 Racing for running Brembo master cylinders rather than stock. Arnchu racing was running a Brembo 19×18 and 5150 was running a Brembo 19×20.

The rule in question reads as follows: “l) Steel braided or Kevlar brake lines may be used. Brake pads may be changed. Brake rotors may be changed to OEM spec steel rotors. No carbon fiber, cast iron or other exotic materials unless stock. No oversized rotors. Master cylinders may be replaced with exact replica master cylinders (this means same bore and stroke and exactly the same fluid displacement).”

The Brembo masters are not exact replicas of the stock. While the bore is the same (.749 inches for all 4 we measured) the stroke is not the same (.382 inches for stock and .365 inches for both Brembo’s). However the main issue is the design of the piston which is drastically different and does increase the performance of the brakes when compared to the stock master cylinder.

While we do not feel the teams in question were actively attempting to cheat and were misled to an extent, the parts are still not legal and we have had to disqualify them.

Sean P Clarke WERA Motorcycle Roadracing wera.com

Editorial Note: Vesrah Suzuki won the race, with Arnchu Racing finishing second overall and 5150 finishing fourth overall. Macheca Racing, which finished third overall, now moves up to second overall in the official results.