CYLINDER MASTER BRAKE
mounting holes one drilled all the way through and one hole threaded into casting, mounting holes 3 1/8 center to center.
Master Brake Cylinder MB / GPW / M201
Complete with rubber dust boot and filler cap
Brake master cylinder for WWII jeeps to original specifications. Supplied complete with rubber dust boot and filler cap in original style. This cylinder features the characteristic round reservoir as found on originals.
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Material Cast steel with brass outlet fitting |
Mounting 2 mounting holes, centre distance 3-1/8 inch (79 mm) |
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Application Willys MB, Ford GPW, Hotchkiss M201 |
Delivery scope Cylinder, rubber dust boot, filler cap |
Features
- Round reservoir in original style
- Complete with rubber dust boot and filler cap
- 2 mounting holes with centre distance 79 mm (3-1/8")
- Ready for fitting to original chassis mounting
- Suitable for 6V brake system with drum brakes
★ High-quality reproduction to WWII specifications. Direct replacement for original master brake cylinder on military jeeps from the 1941-1945 period.
Application
Fits Willys MB (1941-1945), Ford GPW (1941-1945) and Hotchkiss M201. Note: for early CJ-2A jeeps only up to serial number 215649. Later CJ-2A models used a different cylinder with different mounting.
Installation notes
Check before fitting that the front mounting hole in the frame is tapped (threaded). The centre distance between mounting holes must be 3-1/8 inch (79 mm). Use new copper sealing washers at the outlet fitting. Bleed the system completely after fitting — begin at the master cylinder, then from longest to shortest brake line (right rear → left front).
Compatibility
Different versions of master brake cylinders exist for jeeps: early style with one front threaded mounting hole (this cylinder) versus late style with both holes unthreaded. Check your original cylinder before ordering. Not suitable for later CJ models (CJ-3A, CJ-5, M38, M38A1) — these use a different model with different mounting.
Historical context
The single-cylinder master brake cylinder with round reservoir was standard on all WWII military jeeps from 1941 to 1945. The system operated with a single fluid reservoir and controlled both front and rear brakes via a Y-splitter — simple yet effective for military purposes.
This description was generated automatically. Unsure about fitment? Contact us at info@willys.be.
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This part is intended for the restoration of historic military vehicles. Fitting, aligning, deburring or reworking is part of that work and is inherent to the nature of these goods. Dimensional variation also exists between original vehicles.
Installation requires technical knowledge of the vehicle. Unsure whether this part suits your version? Ask us before purchase at info@willys.be.
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Ford GPW (early) | 1942 |
| Ford GPW | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 (early) | 1956, 1957, 1958, 1959 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
📐 Diagrams & technical drawings
From the original Technical Manual TM 9-1803B — Ordnance Maintenance — Power Train, Body & Frame — only for Willys MB / Ford GPW (¼-ton 4×4)
