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

This is an in-depth technical guide to the FAW J6P Brake Line system, a critical safety network on the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This deconstruction analyzes the 30 primary serviceable components that form the complete pneumatic brake circuit, from the air compressor to the final brake hoses.

The FAW J6P Brake Line system is a complex pneumatic network that powers the vehicle’s service brakes and parking brakes. Unlike a hydraulic system, this air brake system is engineered for the extreme demands of a heavy-duty dump truck, providing reliable stopping power under full load. The FAW J6P Brake Line is responsible for generating, treating, storing, and distributing compressed air to all three axles, as well as the hand brake valve. This deconstruction will analyze the key serviceable assemblies of the FAW J6P Brake Line, including the air protection valve, the numerous pipe assemblies, and the various brackets and hoses. A leak-free and fully functional FAW J6P Brake Line system is the most critical safety feature of the vehicle.

Core 1: The “Generation & Protection” Logic (The Air Source)

This group forms the heart of the FAW J6P Brake Line system. It is responsible for generating compressed air, treating it, and protecting the different brake circuits from one another.

1. Component: ‘Air pipe assy – air compressor to air dryer’ (3506210-56A & 3506215-Y494)
This (Comp 15 & 30) is the first stage of the FAW J6P Brake Line. This pipe carries hot, moist air from the engine-mounted air compressor to the air dryer (air processing unit). This line is often metal or reinforced for high temperatures.

2. Component: ‘Four-circuit protection valve’ (3515014-8E) – Qty 1
This (Comp 14) is arguably the most important safety device in the entire FAW J6P Brake Line. The Circuit Protection Logic is critical: this valve receives clean, dry air from the air dryer and splits it into four protected circuits (e.g., front brakes, rear brakes, park brake, accessories). If one circuit fails (e.g., a hose bursts), this valve seals it off, ensuring the other three circuits remain pressurized and functional.

3. Component: ‘Shaped seal gasket – four-circuit’ (3515013-93) – Qty 2
This (Comp 17) is the specialized gasket that seals the four-circuit protection valve, ensuring no leaks occur at this central distribution point. A failure here would compromise the entire FAW J6P Brake Line system.

Core 2: The “Service Line” Logic (Frame & Axle Pipes)

This group represents the extensive network of pipes, hoses, and brackets that route compressed air from the protection valve (Core 1) to the individual wheel brakes. This is the main plumbing of the FAW J6P Brake Line.

1. Component: ‘Front air pipe assy’ (3506205-60A) & ‘Front brake hose assy’ (3506040-75A)
This (Comp 5 & 18) is the circuit for the front axle. The ‘Front air pipe assy’ is the main rigid line, while the ‘Front brake hose’ is the flexible rubber hose that connects from the FAW J6P Frame to the moving axle, allowing for steering and suspension travel.

2. Component: ‘Pipe assy’ (3506100-14BJ) & ‘Rear air pipe assy’ (3506215-Y494)
This (Comp 26 & 30) forms the main service line to the rear tandem axles. This is a long, complex pipe assembly that runs the length of the FAW J6P Frame.

3. Component: ‘Pipe Bracket’ & ‘Pipe Clamp’ (Various)
This (Comp 6, 9, 10, 11, 22, 23, 25, 27, 28) is a large group of specialized brackets and clamps. The Vibration Protection Logic is essential for a FAW J6P Brake Line. These brackets (e.g., ‘Left/Right pipe bracket’, ‘Air pipe support bracket’) secure the air lines to the frame and chassis, preventing them from chafing, vibrating, or being struck by debris. A single failed bracket can lead to a chafed line and a critical air leak.

Core 3: The “Control” Logic (Valves & Cab Interface)

This group of components controls the FAW J6P Brake Line system, translating driver inputs (foot pedal and hand valve) into pneumatic signals.

1. Component: ‘Hand brake valve assy’ (3508010-704) – Qty 1
This (Comp 19) is the driver-operated park brake valve in the cab. It controls the application and release of the powerful spring brakes on the rear axles. This is a primary control for the FAW J6P Brake Line.

2. Component: ‘Cab pipe assy (Style drawing)’ (3506300-96U) – Qty 1
This (Comp 20) is the bundle of air lines that runs from the chassis up to the cab. It carries supply air *to* the hand brake valve (Comp 19) and the foot valve (Comp 21), and carries the “signal” air *back down* to the brake system.

3. Component: ‘Brake base plate & slack adjuster assy’ (3504020-76W) – Qty 1
This (Comp 21) is the main foot valve assembly, mounted to the cab floor. When the driver presses the brake pedal, this valve opens and sends a proportional amount of air pressure through the FAW J6P Brake Line to all service brakes.

4. Component: ‘Pneumatic valve module assy’ (3513010-Y494) – Qty 1
This (Comp 29) is a complex module, likely a relay valve or ABS modulator. The Relay Logic is that this valve receives a low-volume “signal” from the driver’s foot valve and opens to deliver a high-volume, high-pressure blast of air from a nearby reservoir directly to the rear brake chambers. This eliminates the “lag” that would occur if the air had to travel all the way from the cab, making the FAW J6P Brake Line responsive.

FAW J6P Brake Line: Complete 30-Part Breakdown

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

Core Specifications

The specifications for the FAW J6P Brake Line system are defined by its complex, multi-circuit pneumatic design, ensuring fail-safe operation. A leak-free FAW J6P Brake Line is the most critical safety system on the vehicle.