15″ × 4″ Steer Brake Drum — replaces 3800X · 65545B
Front steer-axle brake drum for medium-duty trucks and transit buses. 15″ × 4″ friction surface cast in SAE J431 G11H20b gray iron for heat dissipation and fade resistance. Outboard mount on a 10-hole, 11.25″ bolt circle, machined to a tightly toleranced brake surface for low run-out. Interchanges with the Gunite 3800X family.
Technical data sheet
TBP-0540034 · REV 03/2026- Meritor FF & FL-series front (non-drive) steer axles
- Dana Spicer D-series & E-series steer axles
- Class 6–7 medium-duty truck front axles (Freightliner, International)
- Transit and shuttle bus front axles
Why this drum
Cast in SAE J431 G11H20b gray iron for heat dissipation and fade resistance
Outboard mount — 10 × 1.25″ holes on an 11.25″ (285.75 mm) bolt circle
CNC-machined brake surface, tightly toleranced for low run-out
Coated sand-mold casting, 12 mm minimum wall for consistent thickness
Vietnam origin — zero anti-dumping duty to the US
OEM-interchangeable with Gunite, ConMet, Webb and Meritor — no modification required
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