Accossato thumb brake master cylinder MP002
02 · Data & docs

The facts.

Technical data
Part numberMP002
TypeHand rear master cylinder (HRMC)
Piston diameter10.5 mm
LeverStandard length, bracket included
BodyCNC-worked aluminium, black oxidation
Hose fitment8 mm
PairingNot for use with a separate rear brake master cylinder
Road approvalNo German approval documented
DescriptionThe whole story▼

The Accossato MP002, known as the HRMC, is a hand rear master cylinder operated with the left hand rather than the right foot, giving riders an alternative way to apply rear brake pressure while correcting entry into a corner or modulating the braking process more precisely. It uses a 10.5 mm piston, the smaller of the two bore sizes Accossato offers in this configuration, and comes with a standard-length lever together with a specific mounting bracket designed to optimise the volumes around the handlebar. It is built for riders who want rear brake control at the hand rather than the thumb or the standard pedal.

Key Features

  • 10.5 mm piston diameter for a lighter hand-lever action
  • Hand-operated, actuated with the left hand rather than a foot pedal
  • Standard-length lever paired with a dedicated mounting bracket
  • Bracket shaped to optimise fitment around the handlebar
  • CNC-worked aluminium body with a black hard oxidation finish
  • 8 mm brake hose fitting matched to the piston size
  • Not intended for use alongside a separate rear brake master cylinder

Construction and Material Quality

The body is CNC-worked from aluminium with a hard, black surface oxidation treatment, matching the finish used across Accossato's rear brake range. The bracket supplied with the MP002 is not a generic clamp but a part engineered specifically for this unit, shaped to optimise the space it occupies on the bar rather than simply bolting a standard lever assembly in place. An 8 mm brake hose fitting is used, matched to the 10.5 mm piston, and the lever itself is the standard length Accossato specifies for this HRMC configuration rather than a short or long alternative.

Hand-Operated Rear Braking Explained

Where a thumb brake asks the rider to press with the thumb alone, the HRMC uses the whole hand to pull a lever, which Accossato describes as easing and correcting entry into a curve by giving finer control over the braking process than a standard pedal alone. This makes the MP002 suited to riders who want to blend front and rear braking from the same hand, or who find a hand lever easier to modulate than a thumb press or a foot pedal in certain situations. Accossato does not recommend using the MP002 together with a rear brake master cylinder such as the MP001 or MP003 on the same circuit; the HRMC is intended to work as its own control rather than alongside a second, independent rear master cylinder.

Fitment and Compatibility

Accossato does not list the MP002 against any particular motorcycle, and no model-specific fitment entry exists for it; it is sold as a universal hand rear master cylinder for whichever bar it is bolted to. Before buying, make sure the dedicated bracket will clamp your handlebar, that the 8 mm hose fitting suits your rear brake line, and that the 10.5 mm piston is the right size for 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 MP002 hand rear master cylinder with the standard-length lever and the specific mounting bracket, in black CNC-worked aluminium. The fluid reservoir and brake hose are not included and must be sourced separately.

Specifications

  • Part number: MP002
  • Type: Hand rear master cylinder (HRMC)
  • Piston diameter: 10.5 mm
  • Lever: Standard length, bracket included
  • Body: CNC-worked aluminium, black oxidation
  • Hose fitment: 8 mm
  • Pairing: Not for use with a separate rear brake master cylinder
  • Road approval: No German approval documented
FitmentWhich bikes this fits▼
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