According to Brembo "The 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."
"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."
"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".
I knew within the first few laps of my first track day that the standard Honda master cylinder was going
For years I've watched BSB, WSB and MotoGP and had seen bikes up close in the paddock. 95% of them all have or had Brembo brakes. It was a brand to aspire too, and this was my chance!
I already had braided hoses and HH pads so it was the next logical upgrade.
After speaking to HPS I purchased the RCS as it would work perfectly with my Nissin calipers and give me the power and feel I needed. 8 trackdays later (with the addition of EBC GP Fax race pads - another recommendation from HPS) and I've now got the best brakes I've ever experienced.
My RR6 Fireblade with radial calipers can't touch the setup on the 929, and like the rest of the bike, the brakes are now well above my performance level.
One finger from 100mph plus will plough the front tyre into the ground and lift the rear, as it has done on quite a few occasions, but its very controllable.
I'm now at the point of having to adjust my braking markers at nearly all corners as I know I'm only using the brakes to 75-80% of there performance. My brain screams "you've done it this time, you're not stopping this" and it stops to make the turn with space to spare.
On every corner though you have to scare yourself a bit to learn the performance level. I'm convinced this is the area of my riding that once improved, is going to reduce the lap times the most.
As expected the RCS was a breeze to fit. That saying, if you haven't worked on brakes before, get someone who knows what they're doing to show you or book it in to your local bike shop.
At the time of fitting I also took the opportunity to fit banjo's with bleed points on each caliper and where the lines at the top of the system mount onto the angle adapter.
I run the racing line setup where a brake line goes from the front calipers to the master cylinder, so you end up with both banjos near the lever. Due to the angles of the banjos you might have to fit an adapter seen below so you.
If you fit EBC GP Fax race pads (see our review on these) and use racing brake fluid you won't go far wrong!
18 - In this setting the lever has a longer travel and the braking power is very progressive.
20 - I use this setting. Its half the travel span of the 18 setting and it gives a more solid feeling on the lever. For the track it it still has a fantastic level of modulation.
To change the ratios you simply remove the rubber bung on the lever mount, place a flat head screwdriver into the inner screw and rotate it either left or right. When the inner screw shows red on the turn shaft you have the 18 ratio is selected. If you can't see any red on the shaft it's in the 20 ratio setting.
TOTAL SCORE 27/30
Everyone likes an upgrade right, well, I tried to upgrade the RCS setup by fitting a remote span adjuster - Not made by Brembo though.
The adjuster mounts to the left bar and its basically a wheel that rotates a wire linked to the span adjuster on the front lever.
This just allows you to alter the biting point of the lever. It was developed in racing so that if the lever started to come back to the bar mid race the rider could adjust it out without having to stop.
To fit it to the Brembo RCS, you remove the plastic standard adjuster - which as standard is only do-able if you pull over and turn it, and mount the remote adjuster to it.
The way the kit was delivered, was to remove the adjuster and mount the remote span wire using grub screws. Which I did...
It worked perfectly....in the garage. Imagine my surprise heading into turn 1 at Cadwell Park, a 110 mph corner (at inter's level) where I downshift a gear and dab the brakes to get the bike on the front and pitch it in.
That's not what happened. I sat up, downshifted one and hit the front brake in one movement, but the lever came back 50% more than the previous corner! It still gave enough brakes to not cause an issue, but it certainly got my attention. I slowly made my way back to the pits to see what the issue was. On jumping off the bike it was obvious what had happened, the remote adjuster had parted company from the master cylinder and therefore the adjuster had no tension on it thanks to the spring clip coming off, and the adjuster went wherever the vibration of the bike took it. I couldn't believe something so simple could have caused such a huge potential safety problem. I lock wired it in one position for the rest of the day and then MODE Performance put the whole thing back to standard before my next outing at Donington.
2 days after my Cadwell experience someone smashed their bike up at Snetterton with exactly the same issue except their lever went near to the bar.
My advice is, don't fit them, unless its the official kit. This issue was nothing to do with the Brembo RCS, it was all down to the aftermarket span kit thats now in the bin! Be warned!