Audi RS3 LMS TCR

The Audi RS3 LMS employs a sophisticated dual-control brake system designed specifically for front-wheel drive dynamics. Beyond the standard Brake Bias adjuster, this TCR car features a Rear Brake Pressure Limiter (Proportioning Valve) that independently controls rear brake line pressure without affecting front braking force. This is critical because front-wheel drive cars carry minimal static load on the rear axle, making rear lockup a persistent challenge under heavy braking. The Proportioning Valve allows you to maintain aggressive front braking while preventing rear instability—each step down from maximum increases effective front bias by approximately 1%.

Your setup approach should prioritize the Brake Bias adjuster first, tuning it for light-to-moderate pedal inputs where you'll spend most braking zones. Once that foundation feels balanced, use the Proportioning Valve to fine-tune heavy threshold braking without compromising your established bias for trail-braking phases. Lower valve settings shift effective bias forward during maximum pedal force, forcing the fronts to do more work but extending stopping distances. The ABS system (toggled via F8 Black Box) provides a safety net, though experienced drivers may prefer manual threshold control for maximum rotation on entry. Map brake bias controls before your first session so you can adjust the documented controls while on track.