Accossato radial brake master cylinder CL066 with black lever⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
Part numberCL066
TypeRadial brake master cylinder
Piston diameter14 mm
Lever ratio17-18-19 mm (adjustable)
LeverFolding, long, with relieving eyelet (RST)
BodyCNC-machined aluminium, natural anodised
Hose threadM10x1
Brake light switchNot included (ID001 or ID002 separately)
ReservoirNot included
Road approvalNo German approval documented
DescriptionThe whole story▼

The Accossato PRS 14x17-18-19 takes the scooter-suited 14 mm piston used throughout this part of the range and adds the PRS adjustable pivot system, letting the rider choose between 17, 18 or 19 mm without buying a different master cylinder. Accossato describes this spread as suitable for all uses, since the setting can be moved to suit the situation rather than being fixed at purchase. The folding lever carries a relieving eyelet, the body is natural anodised, and the lever is available in several colours with a matching adjusting knob.

Key Features

  • 14 mm piston diameter, suggested for scooters and smaller motorcycles
  • Adjustable lever pivot distance: 17, 18 or 19 mm to suit the situation of use
  • Folding lever, long version, with a relieving eyelet (RST)
  • Lever supplied in a choice of colours, with a matching adjusting knob
  • CNC-machined aluminium body with a natural anodised finish
  • Offset riser that limits master cylinder flex under hard braking
  • Passive lever stroke reduced by more than 50 percent versus a standard radial master cylinder
  • Stainless steel mounting screws, zinced bleed valve and Formula 1 compound seals

Construction and Material Quality

This PRS unit is forged from aluminium and CNC machined in Italy, finished with the same natural anodising used across the 14 mm family, regardless of which of the three pivot positions is in use. Stainless steel screws, a zinced bleed valve and Formula 1 compound seals are fitted to resist heat cycling and ongoing fluid contact. An offset riser built into the mounting clamp reduces deflection of the body under hard braking at any of the three settings, and the bore shape more than halves the passive stroke compared with a standard radial master cylinder. Hoses connect via the usual M10x1 thread.

Adjustable Pivot: One Lever, Three Settings

Unlike the fixed-pivot 14x18, 14x19 and 14x20 versions in this range, the PRS 14x17-18-19 lets the rider move the pivot distance between three positions on the same lever. A shorter distance within that spread lightens the lever action for everyday riding, while moving toward the longer end gives a more direct, immediate feel at the cost of a touch more hand force, mirroring the difference between the fixed 18 mm and 20 mm versions but without needing to change parts. The 14 mm piston itself stays the same across every setting, so only the leverage ratio, not the amount of fluid moved, changes as the pivot is adjusted. Accossato rates the full spread as suitable for all uses, from relaxed street riding to a firmer track setup, which is the main appeal of choosing the PRS version over a fixed-pivot unit.

Fitment and Compatibility

This PRS master cylinder is sold without a vehicle fitment list, as a universal 14 mm unit for handlebars with a 22 mm clamp diameter. Before ordering, measure your own bars, confirm your brake system is designed for a 14 mm piston, and check that the calliper and disc already fitted match this bore size.

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 PRS 14x17-18-19 radial brake master cylinder fitted with the folding, long lever with relieving eyelet, in the colour selected, together with the matching mounting nut. Stainless steel mounting screws, the zinced bleed valve and the Formula 1 compound seals are assembled on the unit. The stop light switch, available separately as ID001 or ID002, and the fluid reservoir are not included and must be purchased separately.

Specifications

  • Part number: CL066
  • Type: Radial brake master cylinder
  • Piston diameter: 14 mm
  • Lever ratio: 17-18-19 mm (adjustable)
  • Lever: Folding, long, with relieving eyelet (RST)
  • Body: CNC-machined aluminium, natural anodised
  • Hose thread: M10x1
  • Brake light switch: Not included (ID001 or ID002 separately)
  • Reservoir: Not included
  • Road approval: No German approval documented
DownloadsData sheet▼
FitmentWhich bikes this fits▼
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