NOS GM / Delco Moraine 5461975 – 903‑Y (K‑33271)

$44.99

type: Unknown Type
Vendor: CorvairFarmer

Description:

GM / Delco Moraine 5461975 – 903‑Y (K‑33271) is a mid‑1950s front wheel‑cylinder rebuild kit from the 903‑series, the same family as 903‑X and 903‑T. The 903‑Y suffix is one of the less common variants and typically indicates a rubber‑compound update or spring‑style revision used in later service‑stock production. This makes 903‑Y a desirable NOS piece for Tri‑Five restorers.


903‑Y part identity

GM Part: 5461975 Delco Moraine Kit: 903‑Y Alternate Kit Number: K‑33271 Type: Wheel Cylinder Repair Kit Bore Size: 1" Era: 1955–1958 GM full‑size Typical contents: Rubber cups, boots, spring, retainers, piston seals

The 903‑series was Delco’s service line for Tri‑Five and early post‑Tri‑Five brake systems before the 901‑ and 904‑series redesigns.

GM / Delco Moraine 5461975 (903‑Y / K‑33271) Brake Cylinder Repair Kit – NOS

Genuine New Old Stock Delco Moraine 903‑Y wheel‑cylinder rebuild kit for mid‑1950s GM full‑size models. Correct for 1955–58 Chevrolet (150, 210, Bel Air, Biscayne, Impala) and 1955–58 Pontiac (Chieftain, Star Chief, Bonneville) front wheel cylinders using the 1" bore design. This 903‑Y variant is a later GM service‑replacement kit within the 903‑series family.

Details: • GM Part: 5461975 • Delco Kit: 903‑Y • Alternate Kit: K‑33271 • Application: Front wheel cylinders (1") • Models: Chevrolet & Pontiac full‑size, 1955–58 • Condition: NOS, stored in climate‑controlled inventory

A scarce early‑Delco brake component—excellent for Tri‑Five restorations and collectors seeking correct‑era packaging.

 


Fitment chart

Chevrolet – Full‑Size (Front Wheel Cylinders)

  • 1955 150 / 210 / Bel Air

  • 1956 150 / 210 / Bel Air

  • 1957 150 / 210 / Bel Air

  • 1958 Biscayne / Bel Air / Impala

Pontiac – Full‑Size (Front Wheel Cylinders)

  • 1955 Chieftain / Star Chief

  • 1956 Chieftain / Star Chief

  • 1957 Chieftain / Star Chief

  • 1958 Chieftain / Star Chief / Bonneville

These platforms all used the 1-inch Delco front wheel cylinders, making 903‑Y a direct‑fit service

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