15″ × 4″ Steer Brake Drum — replaces 3721AX · 61528B
Front steer-axle brake drum for heavy-duty Class 7–8 trucks. 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 3721AX family.
Technical data sheet
TBP-0540033 · REV 03/2026- Meritor FF & FG-series front (non-drive) steer axles
- Paccar — Peterbilt & Kenworth front steer axles
- International / Navistar front steer axles
- Class 7–8 heavy-duty truck front (steer) position
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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