double piston rear brake caliper
03/04/2014 Filed in: Motor
Rear brakes on the Superdukes aren't known for it's great stopping power. To be more precisely, they are famous for the lack of braking power, even while having the Brembo name. Most Superduke riders never use the rear brake, except for activating the brake light, so who cares. Well, I DO! I want precise control over the brakes not caring whether it's the front or rear brake. Rear brakes can be used to control the bike while cornering or while moving at slow speeds.
So, what to do about this. The original rear brake has a single piston caliper. You can put your whole weight on the brake pedal, and nothing will happen. The first time I thought there was maybe air trapped in the hose, preventing the oil to build up enough pressure to operate the piston. So I bled the system. Then, still nothing happened. What the f..k.
Looking for possibilities to improve this brake light activating system, I found that a double piston rear caliper from a KTM 950 Adventure could fit. You'll need the bracket with it, because the pitch between the two caliper sliders is a little off compared to the original one. Searching the internet finally resulted in a hit after a couple of months. I found a complete rear brake (including the bracket) from a crashed 950 Adventure. It looked a little bit eroded, so I'm guessing this bike has seen some winter driving. But that didn't scare me at all, so I decided to buy it for €40,= (a bargain). At home I disassembled it, and sand blasted the caliper and bracket. After some cleaning I painted it charcoal gray (heat resistant paint) and installed it on the bike ... only to find out that this bracket was a 6.3mm less wide that the original one. Now what?
I made a simple drawing of what I needed, and had a friend of mine lathe a spacer with the correct dimensions. A day later I could finally install the bloody thing. Put some oil in the system and test it. Wow ... what a difference a piston makes. Now I can control that rear wheel when I decide to. I'm in control now ;-)