Camotokiit Rear Brake Master Cylinder Rebuild Kit for Harley 11/16" Bore — Assembled Billet Plunger & Full Seal Set

This rebuild kit contains the precision-machined billet aluminum plunger/piston housing, metal piston, O-rings, seals, spring, spacer and snap ring needed to rebuild a single rear master cylinder assembly. It’s manufactured to replace Harley part numbers 42382-87 and its variants, and is supplied as a fully assembled component so you receive one ready-to-install unit rather than loose small parts. The kit fits a long list of Softail, FXR, Dyna, Electra Glide, Road King and Sportster models covering late 1987 through 2017 where an 11/16" bore rear master cylinder is used.

Which models and years will this kit fit?

This Camotokiit rebuild kit covers many Harley-Davidson models using the 11/16" rear master cylinder bore. The listing includes late-1987 through 2017 Softail and multiple touring, Dyna, FXR and Sportster families, plus specific model exceptions noted by year. Always confirm your OEM part number or bore size before purchasing.

• Covers Softail FLST/FXST models from late 1987–2017 and many Sportster XL/883 models through 2003.
• Fits a wide range of Touring models (Electra Glide, Street Glide, Road Glide, Road King) from 1992–2007 and select years beyond.
• Compatible with Dyna and FXR series listed in the full fitment listing (1991–2017 for many Dyna models).
• Replaces OEM numbers: 42382-87 and 42382-87A/B/C/D/E variants.

What’s included and why does the kit arrive assembled?

The kit ships as a completed assembly: the individual small parts shown in exploded photos are preinstalled into a single plunger/piston assembly for convenience and to reduce installation errors. You get the billet plunger housing, the metal piston, all O-rings and seals, return spring, spacer and snap ring ready to install into the master cylinder bore.

• Billet aluminum plunger/piston housing with factory-grade O-rings for durable sealing.
• Precision metal piston matched to the housing for accurate hydraulic translation.
• New seals, spring, spacer and snap ring included to restore correct preload and travel.
• Delivered assembled to simplify rebuilds and minimize lost parts risk.

How does replacing the master cylinder internals affect brake performance?

Worn or leaking master cylinder internals can cause soft pedal feel, sponginess or fluid loss. Replacing the internal assembly restores proper hydraulic pressure, improves pedal firmness and helps prevent leaks, contributing to predictable rear braking behavior when installed and bled correctly.

• Restores correct piston travel and hydraulic sealing for firmer pedal return.
• Reduces the chance of internal leak paths that cause fading or spongy feel.
• Improves safety margin by returning the system to designed tolerances.
• Works with correct brake fluid and a proper bleed procedure for best results.

Who is this for: This Camotokiit rebuild kit is intended for motorcycle owners, professional mechanics and DIY enthusiasts who need to refurbish a rear 11/16" bore master cylinder on compatible Harley-Davidson models. It’s useful when the original master cylinder shows leaks, excessive pedal travel or diminished feel, or when restoring older bikes where OEM internals are worn. Always verify compatibility with your bike’s year, model and OEM part number before installing, and follow standard brake service safety and bleeding procedures.