A-Premium Rear Drum Brake Wheel Cylinder — Compatible with Chevy & GMC, Cast Iron Direct-Fit

A-Premium Rear Drum Brake Wheel Cylinder replaces original equipment on select Chevy and GMC rear drum brakes for reliable stopping power and easy installation.

This high-quality cast-iron wheel cylinder is engineered as a direct-fit replacement for many Chevrolet and GMC trucks and SUVs from the 1970s through 2000s. It restores hydraulic pressure to each rear wheel’s brake shoes, matching OE thread sizes and bore dimensions so you can refinish the brake system without modification. Before purchase, verify the part references and your vehicle details to ensure correct fitment.

Which vehicles will this A-Premium wheel cylinder fit?

This cylinder fits a broad range of Chevy and GMC rear drum-brake applications, including popular pickups and SUVs. Fitment spans C/K series trucks, Blazer, Tahoe, Suburban, Yukon and more from model years listed by A-Premium. Use your vehicle year, make, model and brake size to confirm compatibility.

• Chevrolet: Blazer 1992–1994; C10/C1500 models 1974–1999 (varies by year and brake size)
• GMC: C15/C1500/C2500, K1500, Suburban and Yukon models across 1974–2000
• Fits rear left and right — driver and passenger sides; check reference numbers (W37785, 18013956, 18018788, 18060167, 19213347)

What are the key specifications and hardware details?

The wheel cylinder is made from cast iron and built to match original dimensional and thread specifications for simple, reliable service. It includes the bleeder screw but does not include a bleeder screw cap, and the inlet thread and bore sizes mirror common OE values used on these models.

• Material: cast iron for durability and corrosion resistance
• Inside bore diameter: 1.188 inch; brake inlet thread: 3/8-24 inch; thread diameter: 3/8
• Bleeder screw included; bleeder screw cap not included

How does installation and maintenance look for this replacement part?

Installation follows standard drum brake service procedures: remove the drum, detach the old cylinder, install the new unit, reconnect the brake line, and bleed the system. Because it’s a direct-fit component, no modification to lines or backing plates should be required when matched to the correct vehicle application. Always follow safety steps and torque specs for brake fittings.

• Direct-fit design reduces installation time versus universal or reman units
• Reuses existing brake hardware when compatible—replace seals and shoes as needed
• Requires proper bleeding after installation to remove air from the hydraulic circuit

What reference numbers and checks should I use before ordering?

Compare the provided part reference numbers and your vehicle’s original part to make sure you select the correct wheel cylinder. Input year, make and model in the listing’s vehicle selector and review any special notes or fitment clarifications A-Premium supplies to prevent returns or delays.

• Common references: W37785, 18013956, 18018788, 18060167, 19213347
• Intended for 10-inch rear drum brake configurations on many model years
• Fitment applies to driver and passenger sides—confirm left/right when ordering

Who is this for? If you own a Chevrolet or GMC truck or SUV from the listed model years and need a dependable replacement for a leaking or seized rear wheel cylinder, this A-Premium cast-iron unit is built to restore brake function with an OE-like fit. Ideal for DIY mechanics, restoration projects, and professional technicians who require dimensionally accurate, vehicle-specific brake components. Always verify fitment with your vehicle details and follow safe brake service practices during installation.