GeoBrakes stocks OEM-grade brake drums confirmed to fit the Chevrolet R20, the cast-iron components that form the friction surface for the R20 drum brake shoes. Available in standard and corrosion-coated configurations for your R20, every drum is manufactured to the correct inner diameter, wall thickness, and surface finish for the Chevrolet R20
The brake drum on the Chevrolet R20 is the rotating cast-iron bowl that the R20 drum brake shoes press against to slow your vehicle. Mounted to the rear axle hub of your Chevrolet R20, it spins with the wheel and provides the friction surface that the shoes contact under braking. Unlike brake rotors, which can be visually inspected from outside the wheel on many R20 vehicles, Chevrolet R20 brake drums fully enclose the shoe assembly, which means wear and damage often goes unnoticed until braking performance on the Chevrolet R20 is noticeably affected.
Standard OEM-Grade Drums for the Chevrolet R20
Standard OEM-grade cast-iron drums for the Chevrolet R20 are manufactured to the original equipment diameter, wall thickness, and surface finish specification for your R20. They are the direct replacement for the factory R20 drum with no modification required.
Coated Brake Drums for the Chevrolet R20
Coated Chevrolet R20 brake drums feature a corrosion-resistant coating applied to the external drum surfaces of your R20, the hat section, outer wall, and wheel mounting face. Surface rust is a common issue on Chevrolet R20 drum brake vehicles in US, particularly during periods of non-use in winter when moisture and salt collect inside the R20 wheel well. A coated drum on your Chevrolet R20 resists surface rust that can transfer to the wheel mounting face, making future drum removal significantly easier at the next R20 brake service.
Chevrolet R20 brake drum replacement requires matching the correct inner diameter, wall thickness, bolt circle, hub bore, and drum offset for your R20. Errors in any of these dimensions produce incorrect shoe-to-drum clearance, uneven wear, and braking problems on the Chevrolet R20. Our vehicle selector eliminates those risks by confirming the correct drum for the Chevrolet R20 exact year, make, model, and axle. Coated R20 drum options are available for vehicles with heavy salt exposure.
How long do brake drums last on a Chevrolet R20?
Chevrolet R20 brake drums typically last 150,000 to 200,000 kilometres with periodic resurfacing, significantly longer than disc brake rotors on the R20. Each resurfacing removes material from the R20 drum and reduces wall thickness. Once the Chevrolet R20 drum reaches its maximum allowable inner diameter, it must be replaced rather than turned again.
Should I replace brake drums on my Chevrolet R20 in pairs?
Yes. Replace both Chevrolet R20 drums on the same axle to maintain balanced braking. Drums of different inner diameters on the R20 create uneven friction forces, causing the Chevrolet R20 to pull to the fresher-drum side during braking.
Should I replace drums and shoes at the same time on my Chevrolet R20?
Yes, it is strongly recommended for the Chevrolet R20. New shoes on a scored or out-of-round R20 drum wear unevenly from day one. New Chevrolet R20 drums with old shoes that have worn to match the old drum surface will contact the new bore incorrectly. Replacing both together on the R20 ensures proper break-in and maximum service life from both components.