| Also known as | W3590 |
| Diagram | Fig. 18 — REAR WHEEL · ref 23 |
| Subsystem | wheels |
| Listed in parts books | 1970, 1974 |
BRAKE BACK PLATE UNF THRD
Rear drum brake back plate with a UNF-threaded anchor stud, PN 37-3590 (also W3590).
This is the rear brake back plate, PN 37-3590, listed with a UNF thread on the anchor stud. It's the plate that carries the rear drum brake components at the hub — the fixed backing that the brake shoes pivot against and that the operating arm pulls on when you step on the rear brake pedal. Catalog listings for this number span 1970 to 1974 and it also shows up under the older W3590 designation, which is the pre-decimal form of the same part.
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If you're rebuilding a rear drum brake assembly, this is the plate that everything else mounts to — shoes, springs, and the operating cam all locate off it. The catalog notes this one uses a UNF thread on the stud; beyond that we'd want to see your old plate or the rest of your parts book before confirming anything more specific about which exact wheel or hub it pairs with.
Given it's a wear-and-tear item that takes some abuse over the years — the stud can get buggered up, the plate can warp or rust — it's worth checking yours over closely before you decide whether to replace it or just clean it up.
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