Rear brake master cylinders

Accossato Rear Brake Master Cylinders for Motorcycles

Discover the range of Accossato rear brake master cylinders for motorcycles, including traditional models, rear radial brake master cylinders, innovative thumb brake master cylinders and index finger brake master cylinders, developed to provide even greater control of the rear brake in sport, racing, supermoto and track applications, as well as in any riding situation where the traditional foot brake pedal may be less practical. Accossato brake master cylinders are engineered to deliver precise control, excellent modulation and long-lasting reliability.

Traditional Rear Brake Master Cylinders

Accossato rear brake master cylinders convert input from the rear brake pedal into hydraulic pressure to operate the rear brake caliper, ensuring smooth, progressive and precise braking performance.

Before purchasing, always verify:

• compatibility with your motorcycle;
• piston diameter;
• hydraulic connections;
• mounting position;
• any aftermarket modifications already fitted.

Thumb Brake Master Cylinders

A thumb brake master cylinder, also known as a motorcycle thumb brake, allows the rider to operate the rear brake directly from the handlebar by applying pressure with the left thumb, without using the traditional foot pedal.

This solution is widely used in racing and high-performance motorcycles, where it provides more precise thumb rear brake control during demanding riding situations.

Accossato thumb brake master cylinders are available with different piston diameters and dedicated accessories to suit a variety of motorcycle applications.

Index Finger Brake Master Cylinders

An index finger brake master cylinder is an evolution of the manual rear brake control system, allowing the rear brake to be operated using the index finger.

This finger-operated rear brake solution is used in selected racing disciplines and by riders seeking a different ergonomic riding position while maintaining direct rear brake control from the handlebar.

How to Choose the Right Rear Brake Master Cylinder

Choosing the correct motorcycle rear brake master cylinder depends on the complete configuration of the motorcycle braking system.

Use the AG Moto Motorcycle Finder by selecting:

• manufacturer;
• engine capacity;
• model;
• year.

Then always verify:

• piston diameter;
• control type (foot pedal, thumb or index finger);
• compatibility with the existing rear brake master cylinder;
• required mounting brackets;
• hydraulic fittings and necessary accessories.

When installing a thumb brake or index finger brake master cylinder, always verify rear brake master cylinder compatibility with the complete braking system and any dedicated components required for correct installation and operation.

Materials and Features

Accossato rear brake master cylinders are manufactured from high-quality materials and, depending on the model, may be CNC-machined from billet aluminium.

The range includes CNC rear brake master cylinders designed for demanding road and racing applications.

Some versions are supplied with a mounting bracket, while others require dedicated accessories sold separately.

Always refer to the product page for complete technical specifications before ordering.

Installation and Safety

Rear brake master cylinders, thumb brake master cylinders and index finger brake master cylinders are critical safety components of the motorcycle braking system.

After installation:

• bleed the hydraulic braking system correctly;
• check for hydraulic leaks;
• verify correct operation of the brake control;
• ensure the lever and hydraulic fittings move freely;
• carry out a complete inspection of the braking system before riding.

Always test the rear brake in a safe environment before normal road or track use.

For maximum safety and reliability, installation and final inspection should always be carried out by qualified personnel.

Choose the Accossato rear brake master cylinder, thumb brake master cylinder or index finger brake master cylinder that best matches your motorcycle, riding style and braking system configuration. Shop online at AG Moto, the official Accossato Racing online store.