Accossato black radial brake master cylinder CY115 with black lever⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
Part numberCY115
TypeRadial brake master cylinder (Ready To Brake)
Piston diameter15 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▼

The smallest piston in Accossato's Ready To Brake range, 15 mm, is suggested for naked and motard bikes, and this black anodised version pairs it with the familiar PRS pivot distance adjustable between 17, 18 and 19 mm. The Shark Design body carries a folding lever offered in seven colours and two lengths, with or without a lightening eyelet, and an integrated micro-switch handles the brake light. It is built for riders who want a lighter-feeling brake on a smaller-displacement or lightly-faired machine.

Key Features

  • 15 mm piston diameter, suggested for naked and motard bikes
  • 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

Even at this smaller 15 mm piston size, the unit is built to the same Ready To Brake standard as the rest of Accossato's range, with Shark Design shaping cutting the passive stroke across every pivot setting without any rider adjustment. The off-set riser's quick-release jumper speeds up servicing and reduces movement of the body under braking, and the fittings, stainless steel screws, a zinc-plated bleed valve and Formula 1 compound seals, match the specification used on the larger 16, 17 and 19 mm units in the same family. The integrated micro-switch adds no meaningful weight.

Why a 15 mm Piston Suits Naked and Motard Riding

Accossato suggests this 15 mm piston specifically for naked and motard bikes, where a lighter front brake feel is generally preferred over the firmer, more demanding bite a larger piston delivers on a heavier or more powerful machine. The PRS pivot distance, adjustable between 17, 18 and 19 mm, gives the same flexibility found on the 16, 17 and 19 mm versions in this family, so the rider can still choose between a softer or sharper lever stroke within that smaller-piston context. On this black anodised body, the lever comes in any of seven colours; the nickel-plated version keeps it black.

Fitment and Compatibility

Rather than naming individual motorcycles, we treat this 15 mm master cylinder as a universal fit for naked and motard machines generally, since Accossato's own guidance is by bike category, not by model. Confirm your handlebar is the standard 22 mm, check your calliper and disc arrangement, and satisfy yourself that a 15 mm piston moves enough fluid for your setup before buying. A nickel-plated edition of the same unit is sold as a separate product.

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 15x17-18-19 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: CY115
  • Type: Radial brake master cylinder (Ready To Brake)
  • Piston diameter: 15 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▼
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