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This is an original vintage Wagner Lockheed style rear hydraulic brake master cylinder for classic Harley-Davidson Big Twin motorcycles. Cast from heavy-duty iron, this square-body unit features an integrated fluid reservoir with large hex top plug, dual frame mounting holes, and a 3/4-inch internal bore. It is ideal for period-correct restoration builds, chopper projects, or OEM-style replacement setups requiring the authentic cast-iron rear hydraulic brake design. Fitment and Compatibility Guide This master cylinder replaces OEM part numbers 41761-58, 41761-78, and 41761-78B. It fits select 1200cc and 1340cc Big Twin models including: Harley-Davidson Panhead FL / FLH Electra Glide / Duo Glide: 1958–1965 Harley-Davidson Shovelhead FL / FLH / FLHF Electra Glide: 1966–Early 1979 Harley-Davidson FX / FXE Super Glide: 1971–Early 1979 Harley-Davidson FXS Low Rider: 1977–Early 1979 Harley-Davidson FXEF Fat Bob: 1979 Verify the dual-bolt flange frame setup before installation.
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used anti rust
Worldwide shipping available
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Estimated delivery: 2-5 business days
All items are carefully packaged for safe transit
Items can be insured — contact us for more information
30-day return policy on most items
Items must be in original condition and packaging
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
Yes, we ship to most countries worldwide. Shipping costs and delivery times vary by location.
Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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