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