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All Balls Master Cylinder Rebuild Kit (18-1017)

Part # 18-1017
Item #132887
Fits 5 motorcycles
  • Yamaha
    • YSR50 · 1987–1992 (front)
    • YZ125 · 1985–1989 (front)
    • YZ250 · 1985–1989 (front)
    • YZ490 · 1985–1990 (front)
    • YZ80 · 1986–1996 (front)

⚠ Brake parts are caliper-specific. The same model can use different calipers by trim or year (base vs SP, ABS, Brembo vs stock), and catalog data isn't always exact. Confirm this fits your bike's actual caliper before ordering.

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WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov
All Balls Racing Master Cylinder Rebuild Kit — Yamaha YSR50 (1987-1992) + 4 more
Product Details

Caliper pistons stuck, sticky lever feel, or a creeping low fluid level with no visible leak — the rubber seals inside the caliper or master cylinder are toast. All Balls rebuild kits include every rubber part you need to make ONE caliper or master cylinder new again: piston seals, dust boots, bleeder caps, pad pins, copper crush washers. OEM-spec EPDM rubber, bike-specific fitment.

Kit fits the bikes listed below. Confirm whether you need front or rear (some bikes share a kit, most don't).

Kit contents:

  • 1x Boot
  • 2x Cup Seal, Master Cylinder
  • 2x Screw
  • 1x Snap Ring
  • 1x Spring
  • 3x Washer

Fitment

  • Yamaha YSR50 1987–1992 (front)
  • Yamaha YZ125 1985–1989 (front)
  • Yamaha YZ250 1985–1989 (front)
  • Yamaha YZ490 1985–1990 (front)
  • Yamaha YZ80 1986–1996 (front)

Brake parts are caliper-specific — the same model can use different calipers by trim or year. Confirm this fits your bike’s actual caliper before ordering.

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