BRAKE MASTER CYLINDER TWO WAY UNION SET FOR FORD GP, GPA, GPW, WILLYS MB SLAT & MB
Brake master cylinder two-way Y-fitting kit
Brass Y-fitting with bolt and copper sealing washers
Complete mounting kit for the brake master cylinder outlet, consisting of the brass Y-fitting, mounting bolt and two copper sealing washers. The fitting splits the brake fluid from the master cylinder to the front and rear brake lines. This kit is recommended with every master cylinder replacement to prevent leakage.
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Material Brass fitting, copper washers, hardened steel bolt |
Parts A-557, 637605, 637604, 637606 |
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Vehicle Ford GP, GPA, GPW — Willys MB Slat & MB |
Kit contents Y-fitting, mounting bolt 1/2-20NF, 2x copper sealing washer |
Features
- Brass Y-fitting (A-557) for two-way distribution of brake fluid
- Hardened bolt (637605) with correct length for guaranteed seal
- Two copper crush washers (637604 and 637606) for leak-free installation
- Bolt also serves as mounting point for brake light switch
- Recommended with every brake master cylinder replacement
★ Supplied complete with all required parts for a professional, leak-free installation of the master cylinder outlet.
Application
Fits Ford GP, GPA, GPW and Willys MB (slat grille and standard MB) from WWII period (1941-1945). Also applicable to early CJ-2A (1946-1949 up to serial number 215649) and M38 (1950-1952) with comparable brake system. Hotchkiss M201 uses identical configuration.
Installation notes
The copper sealing washers (crush washers) are for single use only — always replace when dismounting. Place one washer between master cylinder and Y-fitting, and one on the other side. Thread the bolt (637605) through the fitting into the master cylinder. The brake light switch mounts on the end of this bolt. Ensure correct positioning of the Y-fitting: one outlet towards front (left along frame), one towards rear (through or along frame depending on MB/GPW variant).
Compatibility
Note: this kit fits ONLY vehicles with round reservoir-type master cylinder with 3 1/8" to 3 1/4" mounting distance. Late CJ-2A (from serial number 215649), CJ-3A, CJ-3B, CJ-5 use a different master cylinder type with different mounting configuration. Not compatible with later M38A1 dual-reservoir system.
Historical context
The brass Y-fitting was standard on all WWII jeeps and early post-war civilian models. Original production by Wagner (part number F-5727 for fitting, F-602 and F-603 for washers). The system distributes brake fluid to both axles via a single master cylinder — a robust and reliable design that has survived millions of miles of military service.
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.
ALL_CATEGORIES : BRAKES MASTER CYL CJ2A, BRAKES MASTER CYL CJ3A, BRAKES MASTER CYL M38, BRAKES MASTER CYL CJ3B
This part fits:
| Model | Years |
|---|---|
| Military jeeps | |
| Willys MB (early) | 1941, 1942 |
| Willys MB | 1942, 1943, 1944, 1945 |
| Hotchkiss M201 | 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966 |
| Willys M38A1 | 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971 |
| CJ series | |
| Jeep CJ-2A | 1945, 1946, 1947, 1948, 1949 |
| Jeep CJ-3A | 1949, 1950, 1951, 1952, 1953 |
📐 Diagrams & technical drawings
From the original Technical Manual CJ2A_PL_1949 — Parts List — only for Willys CJ-2A / CJ-3A (1949)
From the original Technical Manual TM 9-1803B — Ordnance Maintenance — Power Train, Body & Frame — only for Willys MB / Ford GPW (¼-ton 4×4)
