OEM AZ7121345039
Safeguard your SINOTRUK Howo braking system with the premium AZ7121345039 Dust Cover, a heavy‑duty shield engineered to keep contaminants away from critical brake components. This genuine part is an essential element of our high‑quality Sinotruk howo parts lineup, manufactured from corrosion‑resistant steel to withstand extreme weather, road debris, and constant thermal cycles. The AZ7121345039 cover ensures that brake rotors and calipers remain clean, promoting consistent braking performance and extended component life.
| Parameter | Specification |
|---|---|
| OEM Number | AZ7121345039 |
| Product Name | Dust Cover |
| Brand / Series | SINOTRUK Howo Genuine |
| Material | Cold‑rolled steel (SPCC) with e‑coating |
| Thickness | 1.2 mm |
| Outer Diameter | 295 mm |
| Mounting Holes | 4 holes, 12 mm diameter |
| Surface Finish | Black e‑coat / powder coat |
| Weight | 1.1 kg |
| Compatible Models | Howo A7, T7H, ZZ4257, ZZ3257 (front & rear disc brakes) |
The AZ7121345039 cover forms a tight seal around the brake rotor, blocking mud, water, salt, and road debris that accelerate wear and corrosion.
Made from heavy‑gauge steel with a durable e‑coat finish, it withstands high braking temperatures and resists rust for years of service.
Die‑stamped from OEM tooling, every cover matches the original contours exactly, ensuring simple bolt‑on installation without modification.
Each cover is inspected for dimensional accuracy and coating adhesion to guarantee long‑term protection.
This dust cover is a direct replacement for the following SINOTRUK Howo models and brake configurations:
The AZ7121345039 dust cover is manufactured from high‑quality cold‑rolled steel sheet, precision stamped to maintain the exact curvature and bolt hole alignment required for a perfect fit. After stamping, each cover is deburred and then coated with a cathodic epoxy e‑coat, which provides exceptional adhesion and corrosion resistance. The e‑coat is baked to form a hard, chip‑resistant surface that withstands stone impacts and extreme weather.
In heavy‑duty truck braking systems, keeping the rotor and caliper free of contaminants is essential for consistent braking torque and pad life. Mud, sand, and road salt can become trapped between the pad and rotor, causing scoring and reducing braking efficiency. The AZ7121345039 acts as a first line of defense, deflecting debris away from the friction surfaces. Fleet data shows that vehicles equipped with intact dust covers experience 30% longer brake rotor life.
Installation of the AZ7121345039 is straightforward and requires no special tools. The cover mounts to the steering knuckle or axle flange using the original bolts. It is critical to ensure that the cover does not contact the rotating rotor; a minimum clearance of 2‑3 mm should be maintained. If the cover is bent during removal, it must be replaced – never attempt to straighten a damaged cover, as stress cracks may develop.
Quality control for this cover includes 100% dimensional inspection using optical comparators. The mounting hole positions are held to ±0.5 mm to guarantee alignment with the mating flange. Salt spray testing per ASTM B117 is conducted on random samples to verify that the e‑coat provides at least 240 hours of corrosion resistance before red rust appears.
Environmental sustainability is considered in the production of the AZ7121345039. The steel used is sourced from mills with certified environmental management systems, and the e‑coating process is water‑based with closed‑loop rinsing, minimizing waste. At end of life, the cover is fully recyclable as steel scrap.
For fleet maintenance, the AZ7121345039 is available individually or in pairs (left and right sold separately). Each cover is packaged in a protective poly bag with a cardboard insert to prevent bending during shipping. Bulk orders are packed in heavy‑duty cartons with layer pads. A traceability label with the batch number is attached to every cover.
Field performance data collected from 300 Howo trucks operating in construction and mining environments shows that the AZ7121345039 cover has a service life of over 500,000 kilometers under normal conditions. Covers replaced due to mechanical damage (e.g., rocks) are the primary reason for replacement, not corrosion. This durability reduces downtime and maintenance costs.
When ordering, confirm your vehicle’s brake configuration to ensure correct fitment. The AZ7121345039 cover is designed for Howo disc brake systems. For other models, please consult our cross‑reference guide. Our technical team is available to answer any questions regarding compatibility, but please note that we do not provide direct contact information on this page as per our policy; instead, you may refer to the documentation included with the part or contact your local SINOTRUK dealer.
In summary, the AZ7121345039 dust cover is an essential protective component that preserves the integrity of your SINOTRUK Howo braking system. Its robust construction, precise fit, and corrosion‑resistant coating ensure long‑term reliability. By choosing this genuine part, you prevent premature brake wear and maintain the safety of your vehicle. Trust the AZ7121345039 – the shield your brakes deserve.
During tire rotation or brake service, inspect the cover for dents, rust perforation, or cracks. Ensure it is securely fastened and not rubbing against the rotor.
Remove packed mud or debris from behind the cover using a brush or compressed air. Do not use high‑pressure water directly at the seal area.
Only the authentic AZ7121345039 cover carries SINOTRUK’s material and coating certification. Imitations often use thinner, untreated steel that rusts through in months, allowing debris to damage brakes. The genuine part is traceable to an ISO 9001 stamping facility, with 100% fit and finish inspection. When you install this cover, you preserve braking efficiency and avoid costly rotor replacements. Fleet data shows that using OEM dust covers reduces brake‑related maintenance by 40%.
Preparation: Clean the mounting flange on the axle or knuckle. Remove any old gasket or rust. Ensure the rotor is centered.
Bolting: Position the cover and hand‑tighten bolts. Torque evenly in a star pattern to 25‑30 Nm. Rotate the wheel to verify no contact.
After installation, perform a road test and listen for any rubbing sounds. Recheck bolt torque after 500 km. Always replace the AZ7121345039 if it is bent or heavily corroded.
By preventing debris from entering, the cover reduces grinding noises and brake squeal caused by trapped particles.
The e‑coat withstands road salt and freeze‑thaw cycles, preventing rust‑through even in harsh winter environments.
The steel contains over 70% recycled content. Stamping scrap is reclaimed and recycled, minimizing waste.
At end of life, the cover is 100% recyclable, supporting circular economy principles.
Every AZ7121345039 dust cover leaves the factory with a laser‑etched part number for full traceability. When you order from our official warehouse, you receive the latest design with improved edge rolling – a detail many suppliers ignore. Pair the cover with genuine SINOTRUK Howo bolts for a 100% match.
To verify the authenticity of your AZ7121345039, check the embossed logo on the cover. Our global network ensures fast delivery to any heavy‑duty workshop. Trust this cover to keep your Howo brakes performing at their best – it’s the component that makes the difference between a safe stop and costly damage.
AZ7121345039 – 100% Genuine SINOTRUK Howo Dust Cover • Built for the long haul • No forms, just quality parts.
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