Accossato black radial brake master cylinder CY109 with black lever⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
Part numberCY109
TypeRadial brake master cylinder (Ready To Brake)
Piston diameter17 mm
Lever ratioPRS 17-18-19 mm (adjustable)
LeverFolding, 7 colours, short or long, RST or NRST
Body finishBlack anodised
Hose threadM10x1
Brake light switchIntegrated micro-switch, included
ReservoirNot included
Road approvalNo German approval documented
DescriptionThe whole story▼

Between the 16 mm and 19 mm piston sizes in Accossato's Ready To Brake range sits this 17 mm unit, which the manufacturer suggests for motorcycles fitted with callipers set at a disc distance of 32 mm or less. The black anodised Shark Design body takes the PRS pivot distance adjustable between 17, 18 and 19 mm, and the folding lever is available in seven colours as well as two lengths, with or without a lightening eyelet. An integrated micro-switch is built in for the brake light.

Key Features

  • 17 mm piston diameter, suggested for calipers set at 32 mm disc distance or less
  • PRS pivot distance adjustable between 17, 18 and 19 mm with no extra tool needed
  • Black anodised aluminium body in Accossato's Shark Design
  • Folding lever available in seven colours, short or long, with (RST) or without (NRST) a lightening eyelet
  • Offset riser with a quick-release jumper that also reduces master cylinder movement
  • Integrated micro-switch for the brake light, built in without adding weight
  • Stainless steel mounting screws and a zinc-plated bleed valve
  • Seals manufactured from Formula 1 compound material

Construction and Material Quality

This 17 mm unit is built on the same Ready To Brake principle as the rest of Accossato's radial range, with the Shark Design shaping reducing passive stroke at every pivot setting without any adjustment from the rider. An off-set riser with a quick-release jumper limits movement of the body during hard braking and speeds up servicing, and the hardware, stainless steel screws, a zinc-plated bleed valve and Formula 1 compound seals, matches the specification Accossato applies across the whole family regardless of piston size. The integrated micro-switch handles the brake light connection without adding meaningful weight.

Sizing This Master Cylinder to Your Calliper

Accossato suggests the 17 mm piston on this black anodised unit for motorcycles whose callipers are set up with a disc distance of 32 mm or less, a measurement specific to how the calliper mounts relative to the disc rather than to any particular brand of bike; because our fitment data does not cover every machine that could match this piston size, we do not list specific motorcycles for this version, and it should be treated as a universal fitment rather than one tied to named models. The PRS pivot distance, adjustable between 17, 18 and 19 mm, works the same way as on the 16 mm and 19 mm versions, letting the rider trade a touch of hand effort for a shorter, sharper lever stroke.

Fitment and Compatibility

We do not tie this 17 mm unit to named motorcycles; Accossato sizes it by calliper geometry rather than by model, so it suits any bike whose callipers sit at a disc distance of 32 mm or less. Measure your own handlebar (22 mm on standard bars), check that calliper measurement, and weigh the 17 mm piston against the fluid volume your brakes need before ordering, since there is no vehicle list to fall back on here. A nickel-plated version of this same body is listed separately.

Road Approval

This master cylinder is not supplied with German road-approval documentation; it is intended for track and competition use.

Scope of Delivery

The package includes the Accossato Ready To Brake PRS 17x17-18-19 radial master cylinder in black anodised finish, fitted with the folding lever in the colour, length and eyelet configuration ordered, the integrated micro-switch, stainless steel mounting screws, the zinc-plated bleed valve and the Formula 1 compound seals already assembled. The fluid reservoir is not included and must be purchased separately.

Specifications

  • Part number: CY109
  • Type: Radial brake master cylinder (Ready To Brake)
  • Piston diameter: 17 mm
  • Lever ratio: PRS 17-18-19 mm (adjustable)
  • Lever: Folding, 7 colours, short or long, RST or NRST
  • Body finish: Black anodised
  • Hose thread: M10x1
  • Brake light switch: Integrated micro-switch, included
  • Reservoir: Not included
  • Road approval: No German approval documented
DownloadsOwner's manual · brochure▼
FitmentWhich bikes this fits▼
    07 · Support

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