- ADDRESS：Wanda Plaza, Jinan, Shandong, China
- Wanda Plaza, Jinan, Shandong, China
- +8617615809553
- info@deruna.com
The WG4007443016 Sitrak Caliper Repair Kit [Caliper Guide Bushing] is designed to address common brake caliper issues on SINOTRUK Sitrak C7H, T7H, and A7 series trucks. Over time, the rubber guide bushings degrade, and the guide pins corrode, causing the caliper to stick or seize. This results in uneven brake pad wear, increased fuel consumption due to drag, and reduced braking efficiency. This OEM kit provides all necessary components to restore smooth caliper movement.
Each WG4007443016 kit includes two precision‑ground guide pins, two high‑temperature rubber bushings, two protective dust boots, and a packet of high‑temperature silicone grease. The guide pins are manufactured from stainless steel or hardened carbon steel with a corrosion‑resistant coating, ensuring longevity even in salt‑spray environments. The rubber bushings are formulated from EPDM compound rated for continuous operation from -40°C to +150°C, compatible with DOT 3, DOT 4, and DOT 5.1 brake fluids.
Using the genuine WG4007443016 repair kit during brake service prevents premature caliper replacement, saving fleets significant maintenance costs. A stuck caliper can lead to rotor warping, overheated wheel bearings, and even wheel fire in extreme cases. By restoring proper caliper sliding, this kit ensures that braking force is evenly distributed across both pads, maximizing stopping power and safety.
New guide pins and bushings eliminate sticking, ensuring the caliper self‑centers and applies even pressure to both brake pads, reducing pedal effort and improving feel.
Rubber bushings withstand sustained temperatures up to 150°C. Included silicone grease remains stable up to 200°C, preventing galling of guide pins.
Guide pins feature zinc‑nickel or stainless steel finish (480 h salt spray). Protective boots seal out moisture, dirt, and road salt.
Includes everything needed for one caliper: 2 guide pins, 2 bushings, 2 boots, and high‑temp grease. Saves time sourcing individual components.
The WG4007443016 Caliper Repair Kit is designed for the floating disc brake calipers used on SINOTRUK Sitrak C7H, T7H, and A7 series trucks. It fits both front and rear axles where the caliper uses a guide pin (sliding) design. The kit is compatible with calipers manufactured by WABCO, KNORR‑BREMSE, and Sinotruk’s in‑house foundry. This specific kit is for calipers with 12 mm guide pins and corresponding rubber bushings, which is the standard for heavy‑duty Sitrak applications.
Common symptoms that indicate the need for this repair kit include: uneven brake pad wear (one pad significantly thinner than the other), caliper sticking causing the vehicle to pull to one side, excessive brake dust buildup on one wheel, and audible scraping or squealing from the caliper area. The WG4007443016 kit is also recommended during any brake pad replacement on trucks that have exceeded 300,000 km, as the rubber bushings naturally age and lose elasticity.
For fleets with multiple Sitrak vehicles, stocking the WG4007443016 kit allows technicians to quickly address caliper issues without waiting for special orders. The kit’s components are individually packaged in a sealed bag to prevent contamination before installation. Always order one kit per caliper; a full axle service (two calipers) requires two kits.
| Parameter | Specification | 每个人
|---|---|
| OEM Part Number | WG4007443016 |
| Product Name | Sitrak Caliper Repair Kit [Caliper Guide Bushing] |
| Brand | SINOTRUK Sitrak (Genuine OEM) |
| Kit Contents | 2 x guide pins, 2 x rubber bushings, 2 x dust boots, 1 x grease packet |
| Guide Pin Diameter | 12.0 mm (±0.02 mm) |
| Guide Pin Length | 68 mm (under head) |
| Guide Pin Material | Stainless steel or zinc‑nickel plated carbon steel |
| Bushing Material | High‑temperature EPDM rubber (durometer 70 Shore A) |
| Boot Material | Chloroprene rubber (CR), ozone resistant |
| Grease Type | High‑temperature silicone grease, -40°C to +200°C |
| Operating Temperature | -40°C to +150°C (continuous), +200°C (peak) |
| Corrosion Protection | >480 h salt spray (guide pins) |
| Application | Sitrak C7H / T7H / A7 front and rear disc brake calipers |
* Kit services one caliper (two guide pins). For a full axle (two calipers), order two kits. Always clean the caliper bracket thoroughly before installation.
To install the WG4007443016 repair kit, begin by removing the caliper from the vehicle. Use a wire brush to clean the caliper bracket where the guide pins slide. Remove the old guide pins and bushings; if they are seized, a penetrating oil may be needed. Inspect the caliper bracket bores for damage; if scored, the bracket may need replacement. Lubricate the new bushings with the provided silicone grease and press them into the bracket bores using a suitable socket or press tool. Ensure they are fully seated.
Apply a thin layer of grease to the new guide pins and insert them through the bushings. Install the dust boots over the pins, ensuring they seal against the bracket. Reattach the caliper to the bracket, torquing the mounting bolts to 50‑60 Nm for typical M12 caliper bolts. Pump the brake pedal to seat the caliper pistons before road testing. Always perform a brake burnish procedure after caliper service to ensure proper pad bedding.
Routine inspection of the caliper guide pins should be part of every brake service. If the rubber boots are cracked or torn, or if the guide pins show signs of corrosion, replace the kit immediately. The WG4007443016 kit is designed for a service interval of 300,000‑400,000 km, but in harsh environments (construction, salt belt), more frequent replacement may be necessary. After installation, check for caliper drag by spinning the wheel; it should rotate freely with slight resistance from the pads.
Aftermarket caliper repair kits often use lower‑grade rubber that hardens or swells when exposed to brake fluid, causing the caliper to seize within months. The guide pins in generic kits may be made from soft steel that rusts quickly, leading to the same problem the kit was meant to solve. Genuine WG4007443016 components are formulated to resist brake fluid contamination and maintain dimensional stability at high temperatures. The silicone grease included is specially designed for caliper guide pins, unlike generic grease that can degrade rubber boots.
Using the OEM kit also ensures that the guide pin diameter matches the original bushing interference fit. Incorrectly sized aftermarket pins can cause excessive clearance, leading to caliper vibration and noise, or excessive interference, causing sticking. The genuine kit’s components are 100% inspected to meet SINOTRUK’s quality standards, including 500‑hour salt spray testing for the pins and 1,000‑hour ozone testing for the boots.
For fleets, the cost savings of using genuine WG4007443016 kits are realized through reduced caliper replacements, fewer roadside breakdowns, and extended brake pad life. A stuck caliper can destroy a set of pads and rotors in a matter of days, costing far more than the price of the repair kit. By investing in OEM quality, you ensure that brake service restores the system to like‑new condition.
The WG4007443016 Sitrak Caliper Repair Kit [Caliper Guide Bushing] is an essential component for maintaining the brake system on SINOTRUK Sitrak heavy trucks. By restoring smooth caliper sliding, it ensures even pad wear, optimal braking performance, and extended component life. Choose genuine parts for your next brake service to guarantee safety, reliability, and peace of mind on every journey.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
A PROFESSIONAL CHINA TRUCK AND SPARE PARTS SUPPLIER
@Copyright DERUNA
![AZ9925682112 Silent Stabilizer [Front Solid Metal Bushing]](https://deruna.com/wp-content/uploads/2026/03/AZ9925682112-Silent-Stabilizer-Front-Solid-Metal-Bushing-1.webp)
