The Brembo L54210 is a DOT 4 LV (Low Viscosity) brake fluid, which is specifically recommended for most modern vehicles equipped with advanced electronic braking and stability control systems. 
These systems include:

• Anti-lock Braking Systems (ABS)
• Electronic Stability Programs (ESP)
• Traction Control Systems (TCS)
• Anti-Slip Regulation (ASR)
• Electronic Brakeforce Distribution (EBD) 

The low viscosity of the fluid is crucial for the fast, precise operation of the narrow valves within these electronic systems.