FAW J6P Front Wheel Brake: Deconstructing 30 Critical Parts for Flawless Stopping Power

This is a complete technical guide to the FAW J6P Front Wheel Brake (Model 3501015-901 / 3501020-901) for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This deconstruction analyzes 30 serviceable component types that form the complete S-cam brake assembly, a critical system for vehicle safety.

The FAW J6P Front Wheel Brake is a heavy-duty, S-cam “drum” brake system. This robust design is the industry standard for heavy-duty trucks, prized for its durability, high stopping torque, and field serviceability. Its primary function is to convert the kinetic energy of the 25-ton truck into heat, safely bringing the vehicle to a stop. It does this by using compressed air, supplied by the brake line system, to force a set of brake shoes and linings against the inner surface of the rotating brake drum.

This deconstruction will analyze the key serviceable assemblies of the FAW J6P Front Wheel Brake, including the pneumatic actuator (air chamber), the mechanical linkage (S-cam and slack adjuster), the friction components (brake shoes and linings), and the stationary foundation (brake spider). A properly maintained FAW J6P Front Wheel Brake is the most critical safety system on the front axle, and its condition is non-negotiable for safe operation.

Core 1: The “Actuation” Logic (The Air Chamber)

This is the “muscle” of the FAW J6P Front Wheel Brake. This component converts the pneumatic signal from the brake pedal into powerful mechanical force.

1. Component: ‘Front brake air chamber assy’ (3519110-95A) – Qty 2
This (Comp 1) is the complete air brake chamber. The Pneumatic-to-Mechanical Logic is its function: when the driver presses the brake pedal, compressed air fills this chamber, pushing on a large rubber diaphragm. This diaphragm is connected to a pushrod, which extends out of the chamber with significant force. This is the initial force that actuates the entire FAW J6P Front Wheel Brake.

A leaking diaphragm in this chamber is a common failure point and will result in a dangerous air leak and a significant loss of braking power on that wheel. This makes the air chamber a critical safety component of the FAW J6P Front Wheel Brake.

Core 2: The “Foundation” Logic (The Brake Spider)

This group of components forms the stationary foundation of the FAW J6P Front Wheel Brake. It bolts directly to the steering knuckle and serves as the anchor point for the brake shoes.

1. Component: ‘Left/Right brake spider’ (3501151C242, 3501152C242) – Qty 1 each
This (Comp 5) is the “spider” or “backing plate”. It is a massive, single-piece cast iron or forged steel component. Its Anchor Point Logic is to absorb all the torque and forces generated by the braking action. The brake shoes (Comp 22) are anchored to this spider, and it is the component that the S-cam (Comp 15) passes through.

2. Component: ‘Left/Right brake spider support’ (3501021C242, 3501022C242) – Qty 1 each
This (Comp 7) is the support bracket that adapts the spider (Comp 5) to the steering knuckle. The entire FAW J6P Front Wheel Brake assembly is rigidly bolted to the axle via this bracket.

3. Component: ‘Left/Right brake camshaft support’ (3501127C242, 3501128C242) – Qty 1 each
This (Comp 8) is a supplementary bracket that supports the S-camshaft. This ensures the camshaft cannot flex under load, which would cause uneven brake application. This is a key part of the FAW J6P Front Wheel Brake‘s heavy-duty design.

Core 3: The “Friction” Logic (The Brake Shoes & Linings)

This is the “wear” part of the FAW J6P Front Wheel Brake. These components are designed to be sacrificed to create the friction needed to stop the truck.

1. Component: ‘Front brake shoe assy’ (3501390C242) – Qty 4
This (Comp 22) is the complete brake shoe, which includes the steel “web” and the friction lining. The FAW J6P Front Wheel Brake uses two of these shoes (primary and secondary) per wheel.

2. Component: ‘Brake lining I’ (3501406C242) & ‘Brake lining II’ (3501407C242) – Qty 4 each
This (Comp 23, 24) is the serviceable friction material. The Friction Logic involves two different lining types (I and II), which suggests a “leading/trailing” or “primary/secondary” shoe design. One lining is more aggressive to provide the initial bite, while the other is designed for sustained friction and heat dissipation.

3. Component: ‘Rivet – brake lining’ (3502408BA2T) – Qty 56
This (Comp 25) is the set of rivets used to attach the ‘Brake linings’ (Comp 23, 24) to the steel brake shoe. This riveted design is common in heavy-duty FAW J6P Front Wheel Brake systems as it is strong and allows for the linings to be replaced.

4. Component: ‘Left/Right brake shoe with lining assy’ (3501375C242, 3501380C242)
This (Comp 21) is a pre-assembled unit, providing the complete shoe and lining (Comp 22) as a single part for easier service of the FAW J6P Front Wheel Brake.

Core 4: The “S-Cam & Adjuster” Logic (The Actuation Linkage)

This group of components forms the mechanical link between the air chamber (Core 1) and the brake shoes (Core 3). It translates the linear push from the air chamber into a rotary motion that spreads the shoes apart.

1. Component: ‘Left/Right automatic slack adjuster assy’ (3501205C242, 3501210C242) – Qty 1 each
This (Comp 30) is the “slack adjuster”. This Self-Adjusting Logic is a key feature of a modern FAW J6P Front Wheel Brake. As the brake linings (Comp 23, 24) wear, this device automatically adjusts its angle on the camshaft to ensure the “slack” (distance) between the lining and the drum remains minimal. This provides a consistent, responsive brake pedal.

2. Component: ‘Front brake camshaft’ (3501082-4E) – Qty 4
This (Comp 15) is the ‘S-cam’. This is a forged steel shaft with an “S” shaped head at one end. As the slack adjuster (Comp 30) rotates this shaft, the “S” shape pushes against the ‘Brake shoe rollers’ (Comp 26), forcing the brake shoes apart and into the drum. This is the final mechanical force multiplication in the FAW J6P Front Wheel Brake. Section 17: ‘Lock washer – steering knuckle spindle nut’ (2)

3. Component: ‘Return spring – brake shoe’ (3501436-4E) – Qty 2
This (Comp 20) is a heavy-duty spring. Its Return Logic is to aggressively pull the brake shoes (Comp 22) back away from the brake drum the instant the driver releases the pedal. A weak or broken return spring will cause the brakes to “drag,” leading to extreme overheating and failure of the FAW J6P Front Wheel Brake.

FAW J6P Front Wheel Brake: Complete 30-Part Breakdown

The following table provides the complete, detailed breakdown of all 30 component types in the FAW J6P Front Wheel Brake assembly for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This list is essential for any service of the FAW J6P Front Wheel Brake.

Core Specifications

The specifications for the FAW J6P Front Wheel Brake are defined by its robust S-cam, air-actuated design, built for heavy-duty service. A properly adjusted and maintained FAW J6P Front Wheel Brake is essential for vehicle safety.