The rear brake camshaft is a critical component that ensures your truck’s braking system operates with precision and consistency. The WG9981340226 REAR BRAKE CAMSHAFT (LEFT) from HOWO is engineered to deliver exceptional strength, precise cam lobe geometry, and long‑lasting wear resistance, guaranteeing reliable braking performance and enhanced safety for your heavy‑duty vehicle. As a vital Howo/Sitrak truck parts component, this rear brake camshaft is manufactured from high‑grade alloy steel, precision‑forged and heat‑treated to achieve optimal hardness and toughness, with precisely ground cam lobes and bearing journals that ensure smooth operation and consistent brake shoe actuation. Whether you are performing a full rear brake overhaul or replacing a worn camshaft, the WG9981340226 guarantees factory‑spec performance, superior durability, and dependable braking power – making it the trusted choice for professional workshops and fleet operators worldwide.
The rear brake camshaft is the mechanical link that transforms the linear force of the brake chamber pushrod into the rotary motion needed to expand the brake shoes. The WG9981340226 is specifically designed for the left side of the rear axle, ensuring that your truck’s rear brakes deliver balanced and effective stopping power. Over time, camshafts can suffer from wear on the cam lobes and bearing journals, leading to uneven brake application, reduced braking efficiency, and increased stopping distances. HOWO has engineered this camshaft with induction‑hardened lobes and bearing surfaces that resist galling and scoring, maintaining precise clearance and smooth operation over millions of cycles. Its optimized geometry ensures a progressive and linear brake application, reducing pedal effort and improving driver control. With the WG9981340226, you restore the original braking performance, enhance safety, and prolong the life of your brake components.
Safe Stopping
Consistent Braking
Hardened Lobes
Wear‑Resistant
OEM Grade
Genuine HOWO
Precision Fit
No Play
Accurate engineering data ensures correct application and installation. The WG9981340226 is manufactured to the highest OEM standards, guaranteeing a seamless replacement for your HOWO truck’s left rear brake camshaft.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | WG9981340226 | Exact Match |
| Part Name | REAR BRAKE CAMSHAFT (LEFT) | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / Rear axle | Left side, S‑cam type |
| Material | Alloy steel (40Cr) | Forged & hardened |
| Cam Lift | 14.0 mm | Precision ground |
| Bearing Journal Diameter | 50 mm | Ground finish |
| Overall Length | 360 mm | End‑to‑end |
| Surface Hardness (lobe) | 58–62 HRC | Induction hardened |
| Core Hardness | 28–32 HRC | Toughness |
| Spline Type | Involute, 12 teeth | For brake chamber arm |
| Weight | 3.6 kg | Substantial |
| Warranty | 12 Months | Manufacturer Guarantee |
The WG9981340226 is produced using a multi‑stage manufacturing process that begins with hot‑forging of premium alloy steel to align the grain structure, followed by controlled annealing to relieve internal stresses. CNC turning, milling, and grinding operations bring the camshaft to its final dimensions with an accuracy of ±0.02 mm, ensuring perfect fitment in the axle housing and brake assembly. The cam lobes are induction‑hardened to achieve a surface hardness of 58–62 HRC, providing exceptional resistance to the high‑contact stresses encountered during braking. The bearing journals are ground to a mirror finish (Ra 0.4) to minimize friction and extend the life of the bushings. The splined end is precisely broached to ensure a tight, backlash‑free connection with the brake chamber slack adjuster. Each camshaft is subjected to magnetic particle inspection to detect any surface or subsurface flaws, and a comprehensive dimensional check using CMM equipment guarantees that it meets all OEM specifications. This meticulous engineering ensures that the WG9981340226 delivers consistent, fade‑free braking performance mile after mile.
The WG9981340226 is specifically designed for HOWO heavy‑duty trucks, including T7H, A7, and derivative models equipped with rear S‑cam drum brakes. It is used on the left (driver’s) side of the rear axle, directly replacing the original camshaft with identical dimensions, spline count, and lobe profile. It is compatible with both standard and heavy‑duty brake shoe configurations. This camshaft is also compatible with many Sinotruk and other commercial vehicles that share the same rear brake architecture. To confirm fitment, always cross‑reference the OEM number on your existing camshaft with WG9981340226. If they match, this component will integrate seamlessly. Keeping this camshaft in your spare parts inventory enables rapid brake system repairs, minimising downtime and ensuring that your truck stops safely and predictably.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
Rear Axle
Left Side
Direct Replacement
No Mods
Replacing a worn or scored rear brake camshaft with the WG9981340226 immediately restores the braking efficiency of your rear axle. The precisely ground cam lobes ensure that the brake shoes expand evenly, providing maximum contact with the drum and reducing the risk of brake fade. The reduced friction in the bearing journals translates to lower operating temperatures, extending the life of the lubricant and the bushings. The consistent brake application also minimizes the chance of brake pull or uneven stopping, improving driver control and confidence during emergency stops. The hardened splines eliminate play between the camshaft and the slack adjuster, ensuring that brake adjustments remain stable over time. For fleet operators, a reliable rear brake camshaft reduces brake‑related maintenance, lowers total cost of ownership, and enhances overall vehicle safety. By investing in the WG9981340226, you ensure that your HOWO truck stops as safely and predictably as the day it left the factory.
Installing the WG9981340226 Rear Brake Camshaft requires proper tools and safety precautions. Begin by safely supporting the vehicle and removing the rear wheel and brake drum. Disconnect the brake chamber pushrod and remove the slack adjuster. Unbolt the camshaft retaining brackets and carefully withdraw the old camshaft. Thoroughly clean the axle housing and inspect the bearing bores for wear or damage. Apply a high‑temperature brake grease to the new camshaft’s bearing journals and lobes. Install the new camshaft, ensuring it is properly oriented (the cam lobe profile must match the original). Reinstall the retaining brackets and torque the bolts to specification. Attach the slack adjuster, ensuring the splines are fully engaged, and adjust the brake shoes to the correct clearance. Reconnect the pushrod and test the brake operation by applying air pressure. After a short road test, re‑check the adjustment and re‑torque the retaining bolts. With proper installation, the WG9981340226 will provide years of dependable braking.
Pro Tip: When replacing the camshaft, always install new oil seals and check the condition of the bushings. Worn bushings can cause premature camshaft wear. The WG9981340226 is designed to work with fresh seals and bushings for optimal performance.
Genuine HOWO components are engineered to the highest standards, and the WG9981340226 Rear Brake Camshaft is no exception. Aftermarket camshafts often use lower‑grade steel, inconsistent hardening, or imprecise lobe geometry, leading to rapid wear, brake imbalance, and potential failure. HOWO’s camshaft is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance. By choosing the WG9981340226, you benefit from HOWO’s rigorous testing, including fatigue, wear, and corrosion testing. This ensures that the camshaft meets the demanding requirements of heavy‑duty braking systems. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s global network, giving you confidence in your purchase and long‑term peace of mind.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which vehicles use the WG9981340226?
A: It is designed for HOWO T7H, A7, and other models with rear S‑cam brakes, as well as many Sinotruk trucks with the same axle design.
Q: What are the signs of a worn rear brake camshaft?
A: Uneven brake shoe wear, a pulling sensation during braking, reduced braking effectiveness, and audible knocking or squeaking from the rear brakes are common indicators.
Q: Is this camshaft side‑specific?
A: Yes, the WG9981340226 is specifically for the left (driver) side. The right side uses a mirror‑image camshaft with a different OEM number.
Q: How do I verify the correct part?
A: Check the OEM number stamped on your existing camshaft. If it matches WG9981340226, this is the exact replacement. Consult your vehicle’s parts manual for additional confirmation.
Order your WG9981340226 Rear Brake Camshaft today! Explore our complete selection of genuine HOWO and Sinotruk brake components at Howo/Sitrak truck parts and ensure your truck stops with confidence.
The WG9981340226 Rear Brake Camshaft from HOWO is a testament to precision engineering and unyielding quality. By choosing this genuine component, you ensure that your truck’s rear brakes deliver consistent, powerful stopping performance, protecting your cargo, your drivers, and everyone on the road. Whether you are a professional mechanic or a fleet manager, this camshaft offers the strength, durability, and exact fit required for modern heavy‑duty trucks. Trust HOWO – the benchmark for excellence in heavy‑duty truck components – and experience the difference that genuine quality makes.
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