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Webb Wheel Products · Brakes & Wheel End
WBB78500B
In stock · ships from Knoxville
This is a severe-duty cast iron brake drum designed for heavy-duty truck and trailer axles.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
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All confirmed applications for this part number.
Peterbilt
Peterbilt
The part cross-references to the Peterbilt 78500B drum. This is an outboard mount drum, which must be matched to the specific hub and brake system configuration. Always verify exact dimensions (diameter, width, bolt pattern, pilot diameter) against the existing drum before installation.
Part data verified against 3 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
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It measures 16.5 inches in diameter by 8.625 inches wide and is an outboard-mounted, balanced drum. This part is a critical wear component in the foundation brake system, providing the friction surface for the brake shoes; it is typically replaced when it reaches its wear limit, develops hot spots, or cracks, to ensure safe and reliable braking performance.
Part Number: WBB78500B
SD DRUM 16.5 X 8.625 BALANCED BOLT CI
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside brakes & wheel end
