Dorman First Stop Drum Brake Wheel Cylinder for 1971-1989 Chevrolet GMC W78745

Drum brake wheel cylinder for 1971-1989 Chevrolet GMC by Dorman First Stop used to replace worn or failing factory drum brake cylinders.

Built to meet the manufacturer’s design intent for reliable service.

Key Features

• Direct replacement drum brake wheel cylinder for Chevrolet and GMC models from 1971 to 1989
• Precision engineered to match original fit, function, and performance
• Professionally tested with surface‑tested bores for optimal sealing of pressure cups
• Dimensions: 4.3in x 3.1in x 6.1in; weight 3.2lbs
• Part number W78745

Benefits

• Restores reliable braking performance after wear or failure
• Reduces risk of brake fluid leaks with sealed pressure cups
• Easy to install as a direct fit replacement
• Extends vehicle life by maintaining original drum brake specifications
• Provides peace of mind knowing it meets OEM standards

Application

This part is ideal for owners of Chevrolet and GMC vehicles from the 1970s and 1980s who need a reliable drum brake wheel cylinder after wear, damage or failure. Common use cases include replacement after brake fluid leaks, worn pressure cups, or routine maintenance.

Fitment Notes

• Fits Chevrolet and GMC models from 1971 to 1989
• Part number W78745

Why Choose Dorman - First Stop?

• Choosing Dorman aftermarket replacement parts is a smart way to restore your vehicle with confidence, thanks to a strong focus on fit, durability, and dependable performance. Dorman parts are engineered as direct‑fit replacements designed to match OE form, fit, and function, helping ensure a smoother installation and reliable results. Built with quality materials and validated through testing, they’re made to stand up to daily driving demands and help reduce the risk of repeat repairs. For a long‑lasting fix you can trust, Dorman delivers proven aftermarket solutions that keep your vehicle operating the way it should.

What’s in the Box

• 1 PC

Item Dimensions

• 4.3in x 3.1in x 6.1in, 3.2lbs