Master Cylinders
Rear master cylinders for Harley-Davidson® and custom builds. GMA Engineering’s Kelsey Hayes and Wagner-style 5/8-bore units are the standard for hardtails and forward controls, and V-Twin Mfg offers billet versions for 1979-up. Rebuild kits, plunger pushrod kits and Mid-USA chrome plungers keep an existing master cylinder in service. Match the bore to your caliper: 5/8 for most single-caliper rear setups.
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GMA Engineering Kelsey Hayes Rear Master Cylinder 5/8 Bore Fits Harley-Davidson 1979-1984 FL FX XL
Sale! Price range: $204.95 through $219.957% OFFGMA Engineering billet aluminum Kelsey Hayes-style rear master cylinder delivers factory-correct feel with 5/8-inch bore - available in Natural, Polished, and Black. -
GMA Engineering Wagner Style Rear Master Cylinder 5/8 Bore Fits Harley-Davidson 1958-1979 FL FX
Sale! Price range: $204.95 through $219.957% OFFGMA Engineering billet aluminum Wagner-style rear master cylinder with 5/8-inch bore restores factory braking feel - available in Natural, Polished, and Black. -
Mid-USA V-Factor Chrome Master Cylinder Plunger for Harley-Davidson FL 1970-1979
$10.10Mid-USA V-Factor chrome master cylinder plunger fits Harley-Davidson FL models 1970 through early 1979 - direct OE replacement, replaces HD# 42333-70. -
GMA Engineering 5/8 Bore Rear Master Cylinder Rebuild Kit Kelsey Hayes and Wagner Style
$44.95GMA rebuild kit restores 5/8-inch bore Kelsey Hayes and Wagner-style rear master cylinders to factory hydraulic performance with new piston, seals, and spring. -
V-Twin Mfg 5/8 Bore Rear Master Cylinder Rebuild Kit for Kelsey Hayes and Wagner Style
$33.24Rebuild kit for 5/8-bore Kelsey Hayes and Wagner-style rear master cylinders restores full hydraulic braking function on custom and vintage Harley-Davidson brake setups. -
V-Twin Mfg Kelsey Hayes Master Cylinder Plunger Pushrod Kit for 1970-1979 Harley-Davidson FL
$24.02Kelsey Hayes master cylinder pushrod kit for 1970 to early 1979 Harley-Davidson FL - pushrod, clevis pin, cotter key, and washer for Kelsey Hayes and Wagner cylinders. -
V-Twin Mfg Billet Rear Master Cylinder Kelsey Hayes 5/8 Bore for 1979-1984 Harley-Davidson FL FX XL
$129.95CNC-machined Kelsey Hayes-style 5/8-bore rear master cylinder for 1979-1984 Harley-Davidson FL, FX, and XL models, built to support multi-piston caliper upgrades. -
HardDrive Chrome Rear Master Cylinder Kelsey Hayes 3/4 Bore for 1979-1984 Harley-Davidson FL FX XL
Sale! $150.95$139.957% OFFChrome 3/4-bore Kelsey Hayes-style rear master cylinder for 1979-1984 Harley-Davidson FL, FX, and XL models delivers correct precision-matched braking in a chrome finish. -
V-Twin Mfg Billet Wagner Style Rear Master Cylinder 5/8 Bore for 1958-1979 Harley-Davidson FL FX
Sale! $129.95$119.958% OFFChrome billet upgrade for 1958-1979 Harley-Davidson FL and FX models - Wagner-style 5/8-bore rear master cylinder CNC-machined for multi-piston caliper compatibility on Big Twin restorations. -
V-Twin Mfg 5/8 Bore Billet Rear Master Cylinder Rebuild Kit for Kelsey Hayes and Wagner Style
Sale! $37.73$29.9521% OFFRebuild kit for V-Twin Mfg billet 5/8-bore Kelsey Hayes and Wagner-style rear master cylinders restores full hydraulic braking performance on custom Harley brake setups. -
Drag Specialties Kelsey Hayes Rear Master Cylinder 3/4 Bore for 1979-1984 Harley-Davidson FL FX XL
$149.05Chrome 3/4-bore Kelsey Hayes-style rear master cylinder for 1979-1984 Harley-Davidson FL, FX, and XL replaces OEM 42453-80A in chrome-plated cast aluminum. -
Drag Specialties Mini Rear Master Cylinder Kit 9/16 Bore Black and Chrome
$227.80Drag Specialties mini rear master cylinder kit with 9/16-inch bore in Black Contrast Cut and Chrome - compact design for custom rear brake builds and tight clearance applications. -
V-Twin Mfg Rubber Boot for Kelsey Hayes Rear Master Cylinder 1979-1984 Harley-Davidson
$9.95OE replacement rubber dust boot for Kelsey Hayes style rear master cylinders on 1979-1984 Harley-Davidson FL, 1979-1983 FX, and late-1979-1981 XL models.
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