Brembo updates radial master cylinder

New features derived from MotoGP

By Motorcycle.Com Staff, Jul. 24, 2008
If youre looking to upgrade the brakes on your bike, Brembo has updated its very successful radial master cylinder with new engineering features, all derived from MotoGP.

The new Brembo 19RCS radial brake master cylinder, according to Brembo, retains the geometry, dimensions and functionality of the MotoGP component, while introducing several improvements

Key among the updates is the new ratio click system (RCS). Brembo says this allows the rider to set the brake lever pivot point at one of two distances, 18 or 20 mm, simply by turning a roller cam located on the front of the lever clevis.

With the RCS the change from one setting to another is designed to be simple and the lever ratio can be adapted to the different characteristics of the braking system, the ride or the conditions. Riders can adjust the brake lever pivot using the roller cam above the Italian flag.

Brembos piston, seals and push-rod are the same as those of master cylinders used by all riders in MotoGP and Superbike competition. Brembo says MotoGP and Superbike races provide the ultimate test-bed for these components as they have to withstand late, hard braking and high disc temperatures.

The body of the master cylinder is aluminum alloy forged and machined on CNC equipment. Machining tolerances are the same as those adopted for MotoGP specifications and Brembo says that guarantees a perfect match with the piston.

A hard anodization finish was chosen for the surface of the master cylinder body for durability and resistance to abrasion and corrosion.

As for the brake lever, it is made up of the racing lever clevis and the lever itself, which is forged and hinged to the clevis. The clevis allows angular movement only in the event that the bike should happen to fall or crash. According to Brembo, this prevents the lever from rotating accidentally and provides increased dynamic safety.

The lever span adjustment control has been repositioned and is now aligned with the lever, so that the adjuster can also be located remotely.

Operating this control, the position of the lever contact face remains unchanged relative to the cylinder body, so that the optimum operating angle of the push rod can be maintained. Because of this, Brembo says the lever can be drawn closer to or distanced from the handlebar without any adverse effect on the mechanism, guaranteeing minimal friction and no wasted energy. Brembo brakes are used in MotoGP bikes such as Valentino Rossi's Fiat Yamaha YZF-M1.

A precision push pin and bush assembly hinges the lever to the cylinder body, which is meant to optimize rigidity and provide better feel and wear resistance.

To help ensure that the contact face and push-rod remain permanently engaged, two high-load springs are used. It is claimed that this helps avoid wear through chatter that could be induced by vibrations.

Though ideal for use on the track, Brembo included a housing to accept the mechanical switch of a brake light circuit to set up the 19RCS for street use.

The 16RCS clutch master cylinder is used to make up a set with the 19RCS. The 16RCS is equipped with the ratio clutch system, which Brembo says allows for the adjustment of feel on clutch control. Like the 19RCS, the 16RCS has a forged aluminum alloy body with hard-anodized surface finish.

The 19RCS is available starting Aug. 8 for $340 at the Motorcycle Toy Store.