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- Wanda Plaza, Jinan, Shandong, China
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Superior heat dissipation and extended brake life – The OEM AZ4095450001 Rear Brake Drum is a high‑carbon cast iron component engineered for the rear axles of SINOTRUK HOWO, SHACMAN, and other heavy‑duty commercial vehicles. It provides excellent thermal stability, wear resistance, and structural integrity under extreme braking loads.
Designed with an optimized cooling fin geometry, this drum dissipates heat rapidly, preventing brake fade and ensuring consistent stopping power. For guaranteed compatibility and safety, always choose genuine Sinotruk Homan parts.
The AZ4095450001 Rear Brake Drum is manufactured to precise dimensional tolerances, ensuring a perfect fit with the brake shoes and wheel hub. Its high carbon content (over 3.2%) increases hardness and resistance to thermal cracking, a common failure in lower‑grade drums.
The AZ4095450001 Rear Brake Drum is cast from high‑carbon grey iron (Grade 250 or equivalent) with a pearlitic microstructure that provides excellent wear resistance and thermal conductivity. The carbon content is precisely controlled between 3.2% and 3.6%, with a fine graphite flake distribution that dampens vibration and resists heat checking.
Unlike low‑cost drums that contain recycled scrap, this drum uses virgin pig iron and steel scrap of known composition. The alloy includes small amounts of chromium, copper, and molybdenum to increase hardness at elevated temperatures. The friction surface is machined to a finish of 3.2 µm Ra, providing optimal friction coefficient with standard brake linings.
Fleets using the AZ4095450001 report up to 30% longer drum life compared to economy brands, with reduced incidence of heat cracks and bell‑mouthing. The drum also weighs 10‑15% less than older designs, reducing unsprung mass and improving ride quality.
High carbon content and optimized rib design dissipate heat rapidly, preventing brake fade during long descents or heavy stop‑and‑go traffic.
Pearlitic grey iron with controlled graphite flake size. Resists thermal stress cracking (heat checks) common in lower‑grade drums.
Bore machined to within ±0.1 mm, runout <0.2 mm. Ensures uniform shoe contact and eliminates pulsation.
| OEM Number | AZ4095450001 |
| Product Name | Rear Brake Drum |
| Brand | SINOTRUK Homan |
| Material | High-carbon grey cast iron (Grade 250, ASTM A159) |
| Carbon Content | 3.2% – 3.6% |
| Tensile Strength (min) | 250 MPa (36,000 psi) |
| Hardness (Brinell) | 187 – 241 HB |
| Nominal Diameter (ID) | 410 mm (16.14 in) |
| Overall Width | 220 mm |
| Max Diameter After Wear | 413 mm (replace when exceeding) |
| Bolt Circle / Mounting | 8 holes, M22 studs on 335 mm PCD |
| Cooling Fin Design | External radial ribs, 12 fins |
| Weight (approx.) | 48 kg (106 lbs) |
| Max Operating Temperature | 650°C (intermittent) |
| Standards | ECE R90, FMVSS 121, ISO 9001 |
| Application | SINOTRUK HOWO rear axle, SHACMAN F3000, HANDE 16‑ton axle |
The AZ4095450001 Rear Brake Drum is produced using a green sand molding process with computer‑controlled pouring. The molten iron is inoculated with ferrosilicon to promote uniform graphite nucleation, resulting in a consistent microstructure throughout the drum wall thickness. After casting, the drum undergoes a stress‑relief annealing cycle to eliminate residual casting stresses.
The friction surface is machined on a vertical boring mill with diamond tooling, achieving a bore accuracy of ±0.1 mm and a surface finish of 3.2 µm Ra. The drum is then dynamically balanced to reduce vibration during high‑speed braking. Radial runout is held below 0.2 mm at the outer flange.
The external cooling ribs are designed using computational fluid dynamics (CFD) to maximize heat transfer. Rib height and spacing are optimized for natural convection, reducing the drum’s operating temperature by up to 40°C compared to smooth‑shell designs.
The combination of high carbon content and controlled cooling rates produces a pearlitic matrix with Type A graphite flakes (uniformly distributed). This microstructure provides excellent heat conductivity (≈50 W/m·K) and thermal shock resistance. The presence of chromium (0.2‑0.4%) improves the drum’s hot hardness, reducing wear rates at high temperatures.
Each drum is 100% inspected using magnetic particle testing (MPI) to detect surface cracks. A sonic resonance test checks for internal voids or inclusions. Only drums passing both tests are shipped.
The friction surface is also marked with a maximum wear indicator groove at 413 mm ID. When the groove disappears, the drum must be replaced immediately to avoid brake failure.
The AZ4095450001 is a direct replacement for original brake drums on SINOTRUK HOWO rear axles (16‑ton rating) and SHACMAN F3000. It also fits many aftermarket hubs with the same bolt pattern (8 holes on 335 mm PCD).
Before installation, clean the axle flange and inspect the wheel studs. Slide the drum onto the hub; the fit should be snug but not tight. If the drum is difficult to install, check for rust on the hub register. Do not hammer the drum – a tight fit indicates a mismatch.
Always replace brake drums in pairs on the same axle to maintain balanced braking. Use new wheel nuts and torque to 600 Nm in a star pattern. After first 100 km, re‑torque the nuts.
To replace a worn rear brake drum with the AZ4095450001, follow these steps: 1) Chock the front wheels, raise the axle, and remove the wheel and tire assembly.
2) Remove the existing drum. If stuck, use a brake drum puller – never hammer on the drum. 3) Inspect the brake shoes and hardware; replace if worn. 4) Clean the axle flange and hub register with a wire brush.
5) Install the new drum, aligning the stud holes. The drum should slide on easily. 6) Reinstall the wheel and torque the nuts in a star pattern to 600 Nm.
7) Adjust the brakes (if not self‑adjusting) until slight drag is felt when spinning the drum. 8) Lower the vehicle, pump brakes to seat the shoes, and road‑test at low speed before normal operation.
Inspect the AZ4095450001 Rear Brake Drum every 50,000 km. Look for deep heat checks (cracks longer than 20 mm), scoring deeper than 1.5 mm, or an out‑of‑round condition (more than 1 mm variation). Replace the drum if any of these conditions exist.
Measure the internal diameter with a brake drum gauge. The maximum allowable diameter is 413 mm. If the drum exceeds this, it may not fit new brake shoes correctly and could fail catastrophically. Do not attempt to turn (machine) the drum beyond the maximum spec.
If the drum shows signs of blueing (overheating), check the brake adjustment and ensure the slack adjuster is working. Blueing indicates that the brake was dragging, which can cause drum cracking.
Each batch of AZ4095450001 Rear Brake Drums is tested in an ISO 17025 accredited lab. Tests include: (1) Chemical analysis (spectrometer), (2) Tensile test (per ASTM E8), (3) Hardness test (Brinell), (4) Microstructure evaluation (graphite classification per ASTM A247).
(5) Dimensional inspection (CMM), (6) Dynamic balance test, (7) Hydrostatic pressure test (14 bar for 2 minutes), (8) Magnetic particle inspection for cracks. The drum meets ECE R90 requirements, ensuring it is a certified replacement part for vehicles requiring type approval.
A certificate of conformance (EN 10204 3.1) is included with each shipment. SINOTRUK Homan has supplied over 2 million drums worldwide with a documented defect rate below 0.1%.
A Brazilian mining company operating 100 HOWO off‑road trucks replaced worn drums with the AZ4095450001. After 12 months, drum cracks were reduced by 70% compared to the previous supplier. Brake maintenance intervals extended from 2 months to 6 months, saving over 50,000 USD annually.
A European fleet of SHACMAN tractor units reported that the improved heat dissipation of the AZ4095450001 eliminated brake fade during alpine descents, and the drums remained within wear limits after 400,000 km – double the life of budget drums.
Each AZ4095450001 Rear Brake Drum is packaged in a heavy‑duty corrugated box with foam end caps and a desiccant bag to prevent rust. The box is reinforced for stacking.
A tamper‑evident hologram sticker with the SINOTRUK Homan logo is placed on the drum’s outer surface. The box includes a QR code for authenticity verification. Counterfeit drums often have a rough finish, incorrect weight, or lack the ECE R90 stamp. Genuine drums have a cast‑in “SH” logo and a laser‑etched batch number.
Always purchase from authorized distributors. The genuine AZ4095450001 also includes a 12‑month / 100,000 km warranty against casting defects.
Summary: The SINOTRUK Homan Rear Brake Drum (OEM AZ4095450001) delivers superior heat resistance, wear life, and safety compliance for heavy‑duty truck axles. Upgrade your braking system with genuine OEM drums – the proven choice for reliable stopping power and lower total cost of ownership.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
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