Brembo RCS

GSX-S Brake Upgrade

Suzuki GSX-S1000 Brake Upgrade

The standard GSX-S1000 brakes are well specified but offer very little bite in use,  a Suzuki GSX-S brake upgrade offers a huge improvement in braking power and feel.

Suzuki GSX-S1000 stock brakes
GSX-S1000 Standard brakes
EBC discs GSXS
GSXS1000 Brakes, HEL lines, EBC discs & pads, Brembo RCS


The front brakes use a Nissin Master cylinder with stock rubber lines to twin 4 pot radial mount Brembo Callipers with 32mm pistons acting on twin 310mm discs through Brembo pads.

The standard brake pads are the main weak link, Suzuki obviously choose them for long life, both for pads and discs and thus they have a low coefficient of friction which shows as a lack of bite in use.

A very easy upgrade is to change the pads, the following have all been tested and shown to be a large improvement.  I find the EBC HH to have the best bite with no downside.  Pad Numbers FA447HH front pads and FA174HH rear pads – see catalogue



After 46,000km my brakes were becoming weaker so I decided on new pads, discs and fluid – same pads as before EBC HH, dot 4 fluid and EBC XC discs.  These are lighter fully floating discs with a contoured edge and designe to work with EBC HH pads.

The discs are slightly lighter, look good and work very effectively, there seems to be more power as well as being more progressive than the standard discs with EBC pads

Front disc part No.  MD3109XC (1 disc)

Rear disc part No.  MD3108C

GSXS1000 EBC XC front discsGSXS1000 EBC Rear disc

Brake Lines

As the next part of the GSX-S Brake Upgrade if the brakes still don’t offer enough power or feel then upgrade to braided Stainless Steel lines.  I used HEL lines on mine.  The advantage of the braided lines is that they don’t expand under pressure, unlike the rubber lines.  Thus all the pressure exerted from the master cylinder is translated directly to pushing the pistons and not into expanding the brake lines, thus giving better feel and better braking power.  5 lines in total with a “T” split between the 2 front calipers.  Diagram of stock brake line routing.

Suzuki GSXS Brake and throttle lines Suzuki GSXS Braided Brake lines Suzuki GSXS HEL Brake Lines Suzuki GSX-S Brake Upgrade

Replacing all the brake fluid and bleeding is a pain after but a compressor based vacuum pump made it much easier

Master Cylinder – Brembo RCS

The standard GSXS1000 brakes use a nissin radial master cylinder which limits the feel and power of the brakes.  Brembo RCS radial brake master cylinders allow the rider to choose between power or precision in relation to road conditions, the weather, personal preference for feel and familiarity with the bike. This patented master cylinder, derived directly from the unit used in MotoGP, features an innovative adjustment system that allows the same master cylinder to cater for the many different requirements of even the most exacting customer.

The GSXS750 uses an axial master cylinder.

In an axial master setup, the master cylinder’s bore runs perpendicular to the lever travel. A protrusion on the lever pushes the plunger in the cylinder to force fluid to the calipers, which squeeze the pads and make you stop. Axial master cylinders are still in use on all but the highest-performance bikes. How come? They work well and have been in use for decades. Why reinvent the wheel?

GSX-S Brake Upgrade Axial vs Radial Master Cylinder

Radial cylinders move the piston in the master cylinder in a direction parallel to the lever travel. That’s it. That’s the big difference.

So in practical terms, what does a radial master cylinder get us? Quite simply, improved feel through parts with more rigidity. Rigidity is key to obtaining consistent, crisp braking feel. Many riders say a radial master gives more precise feel through the feedback the rider gets.

Many brake levers allow for lever position adjustment, but a few aftermarket units also allow adjustments in the linkage to give greater or lesser mechanical advantage to the lever. This allows fine tuning of the feel

Created specifically to bring MotoGP and Superbike technology to countless enthusiasts, the Brembo RCS radial master cylinder sets new standards for high performance brake components in terms of technology and style and also offers a great GSX-S Brake Upgrade.

Brembo RCS

Suzuki GSX-S brake upgrade Brembo RCS
Brembo RCS

The RCS system consists of an adjuster that sets the brake lever pivot distance to either 18 or 20 mm, for the perfect feedback between rider and machine: setting the pivot distance to 20 mm makes the braking system more reactive and immediate, while a pivot distance of 18 mm makes it more precisely controllable.

Changing between the two settings is extremely quick: simply adjust the master cylinder pivot distance by turning the adjuster on the front of the guide lever with cam mechanism by 180° using a screwdriver (red indicates 18 mm, black indicates 20 mm). This changes braking power distribution without modifying the pure power of the system itself.

The piston, gaskets and push rod of RCS master cylinders are exactly the same components as those in the master cylinders used by practically all MotoGP and SBK riders, and are manufactured to extremely fine tolerances and ensure very low friction.

The lever consists of two main components: the racing lever guide and the folding, forged lever itself.

Brembo RCS

The RCS radial master cylinder is available in two different versions: 19 and 15.

The numbers indicate the diameter of the piston and define the respective applications for the two versions: the 19RCS must be used in a dual disc system with 4-piston non-floating calipers, whereas the 15 RCS may be installed in single or dual disc systems with 4-piston floating calipers.


The Brembo RCS needs a new Brake reservoir so I installed Rizoma Reservoirs