{"product_id":"gm-delco-moraine-545981-904-y-brake-cylinder-repair-kit-nos","title":"GM \/ Delco Moraine 545981 (904‑Y) Brake Cylinder Repair Kit – NOS*","description":"\u003cp\u003e\u003cspan\u003e\u003cem\u003eGM \/ Delco Moraine 545981\u003c\/em\u003e (904‑Y) Brake Cylinder Repair Kit – NOS*\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGenuine New Old Stock Delco Moraine \u003cstrong\u003e904‑Y\u003c\/strong\u003e wheel‑cylinder rebuild kit for late‑1950s and early‑1960s GM full‑size models. Correct for \u003cstrong\u003e1959–62 Chevrolet\u003c\/strong\u003e (Biscayne, Bel Air, Impala) and \u003cstrong\u003e1959–62 Pontiac\u003c\/strong\u003e (Catalina, Star Chief) front wheel cylinders using the 1\" bore design. This 904‑Y variant is a later GM service‑replacement kit for 904‑R and 904‑Z.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eDetails:\u003c\/strong\u003e • GM Part: 545981* • Delco Code: 904‑Y • Application: Front wheel cylinders (1\") • Models: Chevrolet \u0026amp; Pontiac full‑size, 1959–62 • Condition: NOS, stored in climate‑controlled inventory\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA scarce late‑production Delco brake component—excellent for restoration‑grade builds.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cem\u003eGM \/ Delco Moraine 545981\u003c\/em\u003e – 904‑Y* is a \u003cstrong\u003e1-inch front wheel‑cylinder rebuild kit\u003c\/strong\u003e in the same family as 904‑R and 904‑Z. The 904‑Y variant is less common and typically appears in mid‑1960s GM service stock as a \u003cstrong\u003ereplacement\/supersession kit\u003c\/strong\u003e for earlier 904‑series applications. The asterisk in \u003cstrong\u003e545981\u003c\/strong\u003e* indicates a \u003cstrong\u003eGM supersession or packaging‑batch suffix\u003c\/strong\u003e, not a different part.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003e904‑Y part identity\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eGM Part:\u003c\/strong\u003e 545981* \u003cstrong\u003eDelco Moraine Code:\u003c\/strong\u003e 904‑Y \u003cstrong\u003eType:\u003c\/strong\u003e Front wheel‑cylinder repair kit \u003cstrong\u003eBore Size:\u003c\/strong\u003e \u003cstrong\u003e1\"\u003c\/strong\u003e \u003cstrong\u003eEra:\u003c\/strong\u003e 1959–1962 primary applications, with 1963–64 service supersession \u003cstrong\u003eTypical contents:\u003c\/strong\u003e Rubber cups, boots, spring, retainers (composition varies slightly from 904‑R and 904‑Z)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e904‑Y is a \u003cstrong\u003elater‑production variant\u003c\/strong\u003e of the 904‑series, often used by GM dealers as a direct replacement for 904‑R and 904‑Z.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eFitment chart\u003c\/h2\u003e\n\u003ch3\u003eChevrolet full‑size (front wheel cylinders)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1959 Biscayne \/ Bel Air \/ Impala\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1960 Biscayne \/ Bel Air \/ Impala\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1961 Biscayne \/ Bel Air \/ Impala\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1962 Biscayne \/ Bel Air \/ Impala\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePontiac full‑size (front wheel cylinders)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1959 Catalina \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1960 Catalina \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1961 Catalina \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e1962 Catalina \/ Star Chief\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e904‑Y is a \u003cstrong\u003edirect functional replacement\u003c\/strong\u003e for 904‑R and 904‑Z.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSome GM dealer catalogs list 904‑Y as the \u003cstrong\u003epreferred service kit\u003c\/strong\u003e for 1963–64 full‑size models still using the 1\" cylinder.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eThe “Y” suffix typically indicates a \u003cstrong\u003erubber‑compound update\u003c\/strong\u003e or \u003cstrong\u003espring‑style revision\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CorvairFarmer","offers":[{"title":"Default Title","offer_id":48675965894907,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/3740\/8251\/files\/aa1_27c04dcd-10d3-4a1a-ac37-1faf7060155a.jpg?v=1775942120","url":"https:\/\/corvairfarmer.com\/products\/gm-delco-moraine-545981-904-y-brake-cylinder-repair-kit-nos","provider":"CorvairFarmer","version":"1.0","type":"link"}