FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly: The 2 Critical Components Explained

Welcome to this critical technical guide on the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly (Assembly 554). This is the electronic “brain” of the entire active safety system for the FAW Jiefang CA4251P66K24T1A3E5 6×4 diesel semi-trailer tractor. This assembly is the central computer that prevents wheel lock-up during panic braking.

The FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is the “logic” core of the ABS. Its function is to read data from the wheel speed sensors (see Assembly 550), and, if it detects one or more wheels are about to lock and skid, it instantly commands the brake solenoids (see Assembly 539/545) to “pump” the brakes far faster than any human could.

This in-depth guide is an essential resource for professional diesel technicians and parts specialists. We will deconstruct the entire FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly into its 2 serviceable components as listed: the ‘Anti-lock control unit assembly’ (3605115-50A) itself, and the critical ‘Cross recessed pan head screw assembly’ (Q2360616-S) fasteners that mount it.

Core Component 1: The ‘Anti-lock Control Unit’ (3605115-50A)

The heart of the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is the ‘Anti-lock control unit assembly’ (3605115-50A). This is the “brain” of the entire system. It is a powerful, sealed microcomputer with a dedicated processor, memory, and input/output channels.

**Electronic Logic:** This unit’s “logic” is to perform thousands of calculations every second. It is connected to the truck’s main CAN bus network. Its primary job is to:

1. **1. Monitor:** Continuously receive the pulse signals from all six wheel speed sensors (see Assembly 550 for front sensors).
2. **2. Compare:** Compare the speeds of all wheels to each other and to the vehicle’s “reference speed.”
3. **3. Detect:** Instantly detect a “slip-ratio” anomaly—the moment a wheel begins to decelerate *faster* than the truck itself, which is the precursor to a lock-up.
4. **4. Command:** Send a precise, high-speed command (as a digital signal) to the specific ‘Anti-lock brake solenoid valve’ (see Assembly 539/545) for that wheel.

**Safety Logic:** The “anti-lock” function of the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is a life-saving feature. When a wheel locks, it loses all “lateral” (steering) grip. This means that in a panic stop, a truck without ABS will simply plow straight ahead, even if the driver is turning the steering wheel. The “logic” of this ECU is to prevent that. By pulsing the brake on the locking wheel (up to 15 times per second), it keeps the wheel *just* on the verge of locking, which provides two benefits:

* **1. Maximum Stopping Power:** A tire’s maximum grip (coefficient of friction) is just before it skids. The FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly keeps it in this “sweet spot.” * **2. Full Steering Control:** Because the wheel is still rotating, it retains its lateral grip, allowing the driver to steer around an obstacle *while* performing a full-force emergency stop.

A failure of this FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly (e.g., from water intrusion, voltage spike, or internal short) will immediately disable the ABS and TCS systems and illuminate a warning light on the dashboard.

Core Component 2: The “Bracket Logic” and Fasteners (Q2360616-S)

The “And Bracket” portion of the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is just as critical as the ECU itself. While the bracket is not detailed as a separate part in this specific sub-list (it is often part of the main chassis or another assembly), the *fasteners* that mount the unit to it are.

The parts list calls for three ‘Cross recessed pan head screw assembly’ (Q2360616-S) fasteners. These are the screws that secure the ‘Anti-lock control unit assembly’ (the ECU) to its mounting bracket.

**Bracket Logic:** The “logic” of the bracket is twofold:

• **1. Isolation:** The bracket for the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is almost always “vibration-damped.” It uses rubber “isolators” or “grommets” to “float” the sensitive electronic control unit, protecting its internal circuit boards and solder joints from the constant, high-frequency vibration of the diesel engine and chassis.
• **2. Location:** The bracket must place the ECU in a “safe” location on the truck’s frame—away from the extreme heat of the exhaust/DPF/turbo, and high enough to be protected from direct water spray, mud, and road debris.

**Fastener Logic:** The ‘Cross recessed pan head screw assembly’ (Q2360616-S) is a “combination” (组合) screw. This means it has a pre-installed, captive lock washer (like a spring washer). This “logic” is critical for high-vibration applications. It prevents the screw from backing out and ensures the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly remains securely mounted. A loose ECU would quickly fail from vibration and could lose its critical “ground” connection, disabling the entire ABS.

FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly Parts List

The following table provides the complete, detailed breakdown of all 2 component types (totaling 4 pieces) identified in the ‘Anti-lock Control Unit And Bracket Logic Assembly’ (554) diagram for the FAW CA4251P66K24T1A3E5 tractor.

Technical Specifications and Assembly Context

The specifications for the FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly are defined by its function as the central processing “brain” for the vehicle’s active safety systems. The FAW Anti-Lock Braking System Control Unit And Bracket Logic Assembly is a safety-critical electronic module.