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GeoBrakes stocks OEM-grade brake drums confirmed to fit the Gmc S15, the cast-iron components that form the friction surface for the S15 drum brake shoes. Available in standard and corrosion-coated configurations for your S15, every drum is manufactured to the correct inner diameter, wall thickness, and surface finish for the Gmc S15
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The brake drum on the Gmc S15 is the rotating cast-iron bowl that the S15 drum brake shoes press against to slow your vehicle. Mounted to the rear axle hub of your Gmc S15, 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 S15 vehicles, Gmc S15 brake drums fully enclose the shoe assembly, which means wear and damage often goes unnoticed until braking performance on the Gmc S15 is noticeably affected.
Standard OEM-Grade Drums for the Gmc S15
Standard OEM-grade cast-iron drums for the Gmc S15 are manufactured to the original equipment diameter, wall thickness, and surface finish specification for your S15. They are the direct replacement for the factory S15 drum with no modification required.
Coated Brake Drums for the Gmc S15
Coated Gmc S15 brake drums feature a corrosion-resistant coating applied to the external drum surfaces of your S15, the hat section, outer wall, and wheel mounting face. Surface rust is a common issue on Gmc S15 drum brake vehicles in US, particularly during periods of non-use in winter when moisture and salt collect inside the S15 wheel well. A coated drum on your Gmc S15 resists surface rust that can transfer to the wheel mounting face, making future drum removal significantly easier at the next S15 brake service.
Gmc S15 brake drum replacement requires matching the correct inner diameter, wall thickness, bolt circle, hub bore, and drum offset for your S15. Errors in any of these dimensions produce incorrect shoe-to-drum clearance, uneven wear, and braking problems on the Gmc S15. Our vehicle selector eliminates those risks by confirming the correct drum for the Gmc S15 exact year, make, model, and axle. Coated S15 drum options are available for vehicles with heavy salt exposure.
How long do brake drums last on a Gmc S15?
Gmc S15 brake drums typically last 150,000 to 200,000 kilometres with periodic resurfacing, significantly longer than disc brake rotors on the S15. Each resurfacing removes material from the S15 drum and reduces wall thickness. Once the Gmc S15 drum reaches its maximum allowable inner diameter, it must be replaced rather than turned again.
Should I replace brake drums on my Gmc S15 in pairs?
Yes. Replace both Gmc S15 drums on the same axle to maintain balanced braking. Drums of different inner diameters on the S15 create uneven friction forces, causing the Gmc S15 to pull to the fresher-drum side during braking.
Should I replace drums and shoes at the same time on my Gmc S15?
Yes, it is strongly recommended for the Gmc S15. New shoes on a scored or out-of-round S15 drum wear unevenly from day one. New Gmc S15 drums with old shoes that have worn to match the old drum surface will contact the new bore incorrectly. Replacing both together on the S15 ensures proper break-in and maximum service life from both components.