Dorman - First Stop Drum Brake Wheel Cylinder W20933
Dorman - First Stop Drum Brake Wheel Cylinder W20933 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W20933 - view 3
Dorman - First Stop Drum Brake Wheel Cylinder W20933
Dorman - First Stop Drum Brake Wheel Cylinder W20933 - view 2
Dorman - First Stop Drum Brake Wheel Cylinder W20933 - view 3

Dorman - First Stop Drum Brake Wheel Cylinder P/N:W20933

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$42.99
MPN: W20933
Item Package Quantity: 1
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Dorman - First Stop Drum Brake Wheel Cylinder P/N:W20933
Dorman - First Stop Drum Brake Wheel Cylinder P/N:W20933
$42.99

Put hydraulic muscle behind your classic Chevy or GMC drum brakes with the Dorman - First Stop Drum Brake Wheel Cylinder (W20933). This hydraulic cylinder converts brake-line pressure into the mechanical force that pushes the drum brake shoes outward against the drum. It drops in on select 1955-1965 Chevrolet and GMC applications, cataloged for the front-right and rear-right positions.

  • Direct-fit replacement: engineered to match the original wheel cylinder's fit and function on the listed vehicles, then manufactured and tested for quality assurance.
  • EPDM rubber cups and boots: quality materials built for long-lasting sealing performance.
  • Surface-tested bore: the cast iron cylinder bore is surface-tested to provide an optimum sealing surface for the pressure cups.
  • Ready to install: 1.125 in bore with a 7/16-20 UNF inlet thread and an included bleeder screw (bleeder screw cap not included).

Signs this part may need replacing include brake fluid weeping at the drum backing plate and a soft or sinking brake pedal; diagnose the cause before servicing. If a leaking or seized wheel cylinder is behind the trouble, this replaces it.

Fits (All engines): 1955-1957 & 1959 Chevrolet Bel Air, 1959 Chevrolet Biscayne, 1959 Chevrolet Brookwood, 1960-1963 Chevrolet C10 Pickup, 1957 Chevrolet Corvette, 1957 Chevrolet Del Ray, 1964-1965 Chevrolet G10 Van, 1959 Chevrolet Impala, 1955-1957 Chevrolet One-Fifty Series, 1955-1957 Chevrolet Two-Ten Series, and 1964-1965 GMC G1500. See the Buyer's Guide tab for the full list.

Country of origin: China.

Interchange: 84-36057 · 8436057 · W906120 · 101-1504 · 1011504 · W-82057 · W82057 · 134.62057 · 134.62078 · WC250080 · 375-47033 · 37547033 · 375-47043 · 37547043 · 5455477 · 5455699 · 5456945 · WC20933 · F20933 · Manufacturer part number W20933.

This part cross-references / interchanges with the following part numbers:

84-36057, W906120, 101-1504, W-82057, 134.62057, 134.62078, WC250080, 375-47033, 375-47043, 5455477, 5455699, 5456945, WC20933, F20933

Frequently Asked Questions

What does this drum brake wheel cylinder do?

It converts brake-line hydraulic pressure into mechanical force that pushes the drum brake shoes outward against the drum. If a leaking or seized cylinder is the cause of your trouble, this replaces it.

Which vehicles does the W20933 fit?

It's a direct-fit replacement for select 1955-1965 Chevrolet and GMC models, including the Bel Air, Biscayne, Impala, C10 Pickup, Corvette, G10 Van and GMC G1500. See the Buyer's Guide tab for the full list.

What position is this cylinder cataloged for?

It's cataloged for the front-right and rear-right positions on the listed applications.

Is a bleeder screw included?

Yes, a bleeder screw is included. A bleeder screw cap is not included.

What is the bore size and inlet thread?

It has a 1.125 in cast iron bore with EPDM rubber cups and boots and a 7/16-20 UNF inlet thread.

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