front brake cylinder 16mm for Vespa GTS 125-300cc

Brake pump with larger brake piston diameter suitable for the front brake. The standard brake pump has a brake piston with a little more than 12mm diameter. With this brake pump the diameter is increased to 16mm. This is especially useful when upgrading to an accessory brake calliper, such as a 4-piston calliper (Frando, Brembo). Such a calliper requires more brake fluid (increased volume) to function optimally.

Important: On this front brake master cylinder, the otherwise on these models suitable accessory brake levers can only be used with modifications. To do this, the piston pressure point must be slightly ground on the lever to ensure sufficient air clearance between the brake lever and brake piston. If there is no air clearance, the brakes are applied permanently, so to speak. If the supplied brake lever is used, such a modification is not necessary.