UM Dallara P217 LMP2

The Dallara P217 LMP2 features a sophisticated braking system with adjustable master cylinders and three brake pad compounds. The front and rear master cylinder sizes directly alter line pressure distribution, allowing precise brake bias tuning beyond the standard bias adjustment. Pad compounds range from Low friction (reduced effectiveness, safer in wet conditions) to High friction (maximum performance with increased lockup risk). The dashboard displays real-time brake line pressure, rotor temperatures, and features individual wheel lockup warning lights—critical feedback for optimizing bias and pad selection.

Brake bias should be tuned based on aerodynamic platform stability during braking. Since the P217 is extremely sensitive to ride height changes, excessive rear ride height rise under braking creates a forward balance shift and downforce loss, destabilizing the car. This aerodynamic characteristic often requires more conservative brake bias than pure mechanical grip would suggest. Monitor rear ride height behavior through telemetry when adjusting bias—if the rear rises significantly under heavy braking, consider moving bias rearward or stiffening the rear third spring to maintain aero stability.

Start with Medium pad compound and adjust brake bias in small increments based on lockup warning lights and balance feel. Higher negative camber values increase cornering grip but reduce longitudinal braking grip, requiring bias adjustments to compensate. The differential preload also affects corner entry stability under braking—higher preload increases understeer during deceleration, which may allow more aggressive initial brake application without instability.