⟲ 360° — drag meThe facts.
| Part number | CY090 |
|---|---|
| Type | Radial brake master cylinder (Ready To Brake) |
| Piston diameter | 19 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 |
DescriptionThe whole story▼
Built around a 19 mm piston for dual-disc front brakes, this black anodised Ready To Brake master cylinder is Accossato's largest-bore unit in the PRS 17-18-19 mm adjustable-pivot family, aimed at superbikes and big-displacement naked bikes running two front discs. The Shark Design body carries a folding lever available in any of seven colours and in long or short reach, letting the lever match the rest of the bike's finish even though the master cylinder body itself stays black. An integrated micro-switch takes care of the brake light connection.
Key Features
- 19 mm piston diameter, suitable for dual-disc braking systems
- 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 master cylinder is built on the same Ready To Brake principle as the smaller-bore units in Accossato's range: the Shark Design shaping cuts the passive stroke at every pivot setting without any adjustment from the rider, and that shaping carries through unchanged to this larger 19 mm piston size. The off-set mounting riser includes a quick-release jumper for faster servicing and resists movement of the body during hard braking, while stainless steel screws, a zinc-plated bleed valve and Formula 1 compound seals are specified to withstand heat cycling and continuous brake fluid contact. The integrated micro-switch is built into the clamp without a noticeable weight penalty.
Why a 19 mm Piston Suits Dual-Disc Brakes
Accossato specifies the 19 mm piston on this black anodised unit for dual-disc front brake systems, where two callipers need to be fed with enough fluid volume that a smaller single-disc piston would struggle to move efficiently. The PRS pivot distance, adjustable between 17, 18 and 19 mm, lets the rider set a shorter stroke and sharper bite for track use or a softer, longer pull for road riding, all without changing parts. Because this is the black anodised version, it is also the one offered with a seven-colour lever choice; the nickel-plated sibling keeps the same 19 mm piston and PRS adjustment but supplies the lever only in black.
Fitment and Compatibility
Fifty-four superbikes and big-displacement nakeds from Aprilia, BMW, Ducati, Honda, Kawasaki and Suzuki sit in our fitment data for this 19 mm unit, the Ducati Panigale V4, Aprilia RSV4 RF, Kawasaki ZX-10 R, Suzuki GSX-R 1000 and Honda CB1000R being representative entries. All the exact model years live in the Fitment tab on this page, worth checking against your V5 before ordering. A nickel-plated version of the same Ready To Brake body is listed as its own 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 19x17-18-19 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: CY090
- Type: Radial brake master cylinder (Ready To Brake)
- Piston diameter: 19 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▼
- Aprilia DORSODURO 900 (2017–2019)
- Aprilia RS 660 (2021–2023)
- Aprilia RSV4 (2013–2015)
- Aprilia RSV4 1100 (2019–2023)
- Aprilia RSV4 R (2009–2023)
- Aprilia RSV4 RF (2015–2023)
- Aprilia RSV4 RR (2015–2019)
- Aprilia SHIVER 900 (2017–2020)
- Aprilia TUONO 660 (2021–2023)
- Aprilia TUONO V4 1100 (2015–2016)
- Aprilia TUONO V4 1100 FACTORY (2015–2020)
- Aprilia TUONO V4 1100 RR (2015–2018)
- BMW HP4 (2012–2014)
- BMW K 1300 R (2009–2016)
- BMW K 1300 S (2009–2015)
- BMW K1600 GT (2011–2023)
- BMW K1600 GTL (2011–2023)
- BMW R NINET (2014–2016)
- BMW R1200R (2006–2015)
- BMW R18 (2020–2023)
- Ducati DIAVEL (2011–2019)
- Ducati HYPERMOTARD 821 (2013–2016)
- Ducati Hyperstrada 821 (2013–2016)
- Ducati MONSTER 1200 (2014–2021)
- Ducati MONSTER 796 (2011–2016)
- Ducati MONSTER 797 (2017–2021)
- Ducati MULTISTRADA 1200 (2015–2020)
- Ducati MULTISTRADA 1260 (2018–2020)
- Ducati MULTISTRADA 950 (2017–2021)
- Ducati Panigale 1199 (2012–2017)
- Ducati Panigale 1299 (2015–2018)
- Ducati Panigale 899 (2014–2015)
- Ducati Panigale V4 (2018–2023)
- Ducati SCRAMBLER 1100 (2018–2023)
- Ducati STREETFIGHTER V4 (2020–2023)
- Ducati X DIAVEL (2016–2023)
- Honda CB1000R (2018–2023)
- Honda GL1800 GOLD WING (2018–2023)
- Honda RC213V-S (2016–2018)
- Honda VFR1200F (2010–2016)
- Honda VFR800X Crossrunner (2015–2019)
- Kawasaki GTR 1400 (2014–2017)
- Kawasaki NINJA 1000 SX (2020–2023)
- Kawasaki NINJA H2 (2015–2023)
- Kawasaki Z1000 (2010–2023)
- Kawasaki Z900RS (2018–2020)
- Kawasaki ZX-10 R (2006–2023)
- Kawasaki ZX-10 RR (2016–2023)
- Kawasaki ZX-6R (2003–2026)
- Kawasaki ZZR1400 (2006–2023)
- Suzuki GSX-R 1000 (2003–2023)
- Suzuki GSX-R 600 (2003–2023)
- Suzuki GSX-R 750 (2003–2023)
- Suzuki GSX-S1000 (2015–2023)
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