GM / Delco Moraine 545981 (904‑Y) Brake Cylinder Repair Kit – NOS*

$39.99

type: Unknown Type
Vendor: CorvairFarmer

Description:

GM / Delco Moraine 545981 (904‑Y) Brake Cylinder Repair Kit – NOS*

Genuine New Old Stock Delco Moraine 904‑Y wheel‑cylinder rebuild kit for late‑1950s and early‑1960s GM full‑size models. Correct for 1959–62 Chevrolet (Biscayne, Bel Air, Impala) and 1959–62 Pontiac (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.

Details: • GM Part: 545981* • Delco Code: 904‑Y • Application: Front wheel cylinders (1") • Models: Chevrolet & Pontiac full‑size, 1959–62 • Condition: NOS, stored in climate‑controlled inventory

A scarce late‑production Delco brake component—excellent for restoration‑grade builds.

GM / Delco Moraine 545981 – 904‑Y* is a 1-inch front wheel‑cylinder rebuild kit 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 replacement/supersession kit for earlier 904‑series applications. The asterisk in 545981* indicates a GM supersession or packaging‑batch suffix, not a different part.


904‑Y part identity

GM Part: 545981* Delco Moraine Code: 904‑Y Type: Front wheel‑cylinder repair kit Bore Size: 1" Era: 1959–1962 primary applications, with 1963–64 service supersession Typical contents: Rubber cups, boots, spring, retainers (composition varies slightly from 904‑R and 904‑Z)

904‑Y is a later‑production variant of the 904‑series, often used by GM dealers as a direct replacement for 904‑R and 904‑Z.


Fitment chart

Chevrolet full‑size (front wheel cylinders)

  • 1959 Biscayne / Bel Air / Impala

  • 1960 Biscayne / Bel Air / Impala

  • 1961 Biscayne / Bel Air / Impala

  • 1962 Biscayne / Bel Air / Impala

Pontiac full‑size (front wheel cylinders)

  • 1959 Catalina / Star Chief

  • 1960 Catalina / Star Chief

  • 1961 Catalina / Star Chief

  • 1962 Catalina / Star Chief

Notes

  • 904‑Y is a direct functional replacement for 904‑R and 904‑Z.

  • Some GM dealer catalogs list 904‑Y as the preferred service kit for 1963–64 full‑size models still using the 1" cylinder.

  • The “Y” suffix typically indicates a rubber‑compound update or spring‑style revision

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