Accossato thumb brake master cylinder BP002
02 · Data & docs

The facts.

Technical data
Part numberBP002
TypeThumb brake master cylinder
Piston diameter10.5 mm
LeverShort, bracket included
BodyCNC-worked aluminium, black oxidation
Hose fitment8 mm
PairingPair with MP005 for pedal + thumb control
Road approvalNo German approval documented
DescriptionThe whole story▼

Where the BP001 leaves mounting to the rider, the BP002 pairs the same 10.5 mm thumb brake master cylinder with Accossato's own bracket, so the complete short-lever unit bolts straight to the bar without any fabrication. The 10.5 mm piston keeps the lever action light and easy to feather, which matters when the thumb, rather than the whole foot, is doing the work of modulating rear brake pressure. It is aimed at the same flat track, supermoto and adaptive-control uses as the rest of the thumb brake range, but for riders or workshops who would rather fit a complete kit than machine their own mount.

Key Features

  • 10.5 mm piston diameter for a light, easily modulated rear brake action
  • Short-reach lever for a compact thumb position close to the bar
  • Matching mounting bracket included for a straight bolt-on fit
  • CNC-worked aluminium body with a black hard oxidation finish
  • Suited to flat track, supermoto and adaptive hand-control use
  • 8 mm brake hose fitting matched to the piston size
  • Designed to pair with the double-ended MP005 for combined pedal and thumb braking

Construction and Material Quality

The BP002 shares its CNC-worked aluminium body and black surface oxidation finish with the rest of the Accossato thumb brake family, and is built to the same bore tolerances around the 10.5 mm piston. What sets it apart in manufacturing terms is the bracket, supplied as a matched pair with the master cylinder rather than left to the installer; it is shaped to hold the unit at a sensible angle to the bar without fouling the grip, switchgear or clutch lever. Internally the bore and seals are identical to the bracket-free BP001, so the lever feel and stroke length are unaffected by the extra hardware.

Ready-to-Fit Mounting for Thumb-Operated Braking

Buying the bracket together with the master cylinder removes one of the more fiddly steps of fitting a thumb brake: sourcing or machining a clamp that sits cleanly on a handlebar, clip-on or perch without interfering with the grip or other controls. For a team running several bikes to the same specification, a matched bracket also means the lever ends up in the same place each time, rather than depending on whatever clamp each mechanic happens to fabricate. As with every thumb brake master cylinder in this range, Accossato does not recommend running the BP002 at the same time as a separate rear brake master cylinder on one hydraulic circuit; the double-ended unit, code MP005, is the correct way to keep the pedal brake live alongside thumb control.

Fitment and Compatibility

The BP002 carries no model-specific fitment data and is not listed against any particular motorcycle; it is a universal thumb brake master cylinder intended for whichever handlebar, clip-on or perch the rider's set-up uses. Before ordering, confirm the handlebar or clip-on diameter the bracket needs to clamp, check that an 8 mm brake hose fitting matches your rear brake line, and make sure the 10.5 mm piston suits the fluid volume of your rear brake calliper.

Road Approval

This master cylinder is not supplied with German road-approval documentation; it is intended for off-road, competition and adaptive hand-control use.

Scope of Delivery

The package includes the Accossato BP002 thumb brake master cylinder with the short lever and the matching mounting bracket, finished in black CNC-worked aluminium. The fluid reservoir and brake hose are not included and must be sourced separately.

Specifications

  • Part number: BP002
  • Type: Thumb brake master cylinder
  • Piston diameter: 10.5 mm
  • Lever: Short, bracket included
  • Body: CNC-worked aluminium, black oxidation
  • Hose fitment: 8 mm
  • Pairing: Pair with MP005 for pedal + thumb control
  • Road approval: No German approval documented
FitmentWhich bikes this fits▼
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