Restore Precision Braking: OEM AZ400744006012 Sitrak Caliper R/K [Front Caliper Bushings (3 Per Caliper)] for SINOTRUK Sitrak

🔧 Genuine Sinotruk Sitrak parts — The AZ400744006012 Sitrak Caliper R/K [Front Caliper Bushings (3 Per Caliper)] is a precision repair kit designed for the front disc brake calipers of SINOTRUK Sitrak heavy trucks. This AZ400744006012 set includes three high‑quality rubber bushings that restore proper caliper sliding, eliminate brake drag, and prevent uneven pad wear. Manufactured to original equipment specifications, it ensures consistent braking performance and extends caliper service life.

🔧 Precision Caliper Service: OEM AZ400744006012 Front Caliper Bushing Kit

The AZ400744006012 bushing kit is specifically designed for the RK‑type front disc brake calipers used on SINOTRUK Sitrak C7H, T7H, and A7 trucks. Each caliper requires three rubber bushings that fit into the mounting ears, allowing the caliper to slide smoothly on the guide pins. Over time, these bushings degrade due to heat, moisture, and ozone, causing the caliper to stick, which leads to uneven pad wear, reduced braking efficiency, and increased fuel consumption. Replacing them with this genuine OEM kit restores factory‑spec sliding performance.

Each AZ400744006012 bushing is molded from high‑temperature EPDM rubber compound, formulated to resist brake fluid, road salts, and extreme temperatures from -40°C to +150°C. The bushings feature a precise inner diameter that matches the guide pins (12 mm), ensuring a snug yet movable fit. The outer diameter is engineered to press‑fit into the caliper bracket, eliminating any play that could cause brake noise or vibration. This kit includes all three bushings needed for one caliper, making it a complete service solution.

Neglecting worn caliper bushings can result in seized guide pins, requiring replacement of the entire caliper bracket. Using genuine AZ400744006012 bushings prevents such costly repairs and ensures that your Sitrak’s front brakes operate smoothly for thousands of kilometers. This simple service kit is a cost‑effective way to maintain optimal braking performance and safety.

⚙️ Why Choose OEM AZ400744006012 Caliper Bushings?

📋 Compatibility: SINOTRUK Sitrak Front RK Calipers

The AZ400744006012 bushing set is designed for the RK‑type floating calipers used on the front axles of Sitrak C7H, T7H, and A7 trucks. These calipers are characterized by a cast‑iron body with two or three mounting ears that house the guide bushings. This specific kit is for calipers requiring three bushings (one per mounting ear). It is compatible with both WABCO and KNORR‑BREMSE calipers fitted to SINOTRUK vehicles, as well as original Sinotruk‑branded calipers. Always verify the number of bushings required for your caliper before ordering; some models may use two or four bushings.

Symptoms that indicate worn bushings include: uneven pad wear (inner pad worn more than outer), brake pull to one side, a spongy pedal feel due to caliper movement, or a clunking noise when applying the brakes in reverse. Replacing the bushings with AZ400744006012 resolves these issues and restores proper caliper alignment. For trucks operating in corrosive environments, it is recommended to replace bushings every 300,000‑400,000 km as preventive maintenance.

Fleet managers can standardize on this OEM kit to ensure consistent brake performance across all Sitrak vehicles. The kit is packaged with a corrosion‑resistant sleeve to keep bushings clean until installation. Always use the matching guide pins (part number available separately) for a complete caliper rebuild.

📏 Technical Specifications – OEM AZ400744006012 Caliper Bushing Kit

* Always replace all three bushings per caliper at the same time. Use new guide pins and boots (sold separately) for optimal results. One kit services one caliper.

🛠️ Installation & Maintenance of AZ400744006012 Bushings

Replacing the caliper bushings is a critical part of brake service. Remove the caliper from the vehicle and clean the mounting ears on the caliper bracket thoroughly. Use a small punch or bushing driver to carefully press out the old, degraded bushings. Clean the bores with brake cleaner and inspect for damage. Apply a thin layer of silicone grease to the outside of the new AZ400744006012 bushings and press them into the bores using a suitable socket or press. Ensure they are fully seated and flush with the bracket surface.

After installing the bushings, lubricate the inner diameters with the same silicone grease. Insert new guide pins (order separately) through the bushings and attach the caliper. Torque the guide pin bolts to 30‑35 Nm. The caliper should slide freely with no binding. Any resistance indicates incorrect bushing seating or damaged pins. Test by hand before reinstalling the wheel.

During routine brake inspections, check the bushings for cracks, swelling, or signs of grease leakage. If the bushing rubber feels hard or shows deformation, replace the kit immediately. For fleets operating in severe conditions (mining, logging, salt belt), consider replacing bushings every 200,000 km. Using genuine AZ400744006012 bushings ensures that the caliper will slide smoothly for the entire service interval, preventing uneven pad wear and maximizing brake life.

📈 Long‑Term Value: Genuine AZ400744006012 vs. Aftermarket

Aftermarket caliper bushings often use inferior rubber compounds that harden or swell when exposed to brake fluid, causing the caliper to seize within months. Some generic kits use the wrong durometer (too soft or too hard), leading to excessive play or binding. Genuine AZ400744006012 bushings are formulated to maintain their elasticity and dimensional stability throughout the life of the brake pads. They are tested for 500 hours of immersion in DOT 4 fluid at 120°C with no measurable degradation.

The cost of a stuck caliper can be severe: it can destroy a set of pads and rotors in a single trip, cause overheating that damages wheel bearings, and even lead to a wheel fire. By using genuine bushings, you avoid these risks and ensure that the caliper operates as designed. The kit’s price is a fraction of the cost of replacing a caliper or repairing damage caused by a seized unit.

SINOTRUK’s genuine parts program guarantees that each AZ400744006012 kit meets the original equipment quality standards. When you service your Sitrak’s brakes, you can trust that the replacement bushings will provide the same performance as the factory‑installed components. Protect your investment and your safety by choosing OEM.

✅ OEM AZ400744006012 – The Essential Caliper Restoration Kit

The AZ400744006012 Sitrak Caliper R/K [Front Caliper Bushings (3 Per Caliper)] is a simple yet critical component for maintaining safe, reliable braking on your SINOTRUK Sitrak. By restoring smooth caliper movement, it ensures even pad wear, optimal braking performance, and extended service life. Choose genuine parts for your next brake service and experience the quality that comes from the original equipment manufacturer.

SINOTRUK and Sitrak are registered trademarks of China National Heavy Duty Truck Group. Specifications reference OEM part AZ400744006012.