Ensemble pédale de frein et pédale d'embrayage FAW: Une analyse experte de 22 Composants critiques

Bienvenue dans cette analyse technique experte du Ensemble pédale de frein et pédale d'embrayage FAW (Assemblée 541). C'est le complet, multi-part driver control interface for the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. This assembly is the critical link translating driver intentions into mechanical, pneumatique, and hydraulic actions.

Le Ensemble pédale de frein et pédale d'embrayage FAW est un complexe, firewall-mounted unit. C'est “logique” est triple: it provides the mechanical levers for the driver’s feet (‘Brake pedal assy’ and ‘Clutch pedal assy’), il fournit le “maître” actuation for the hydraulic clutch (‘Clutch master cylinder assy’), and it provides the proportional “logique” for the air brake system (‘Brake valve & connecting head assy’).

Ce guide détaillé est une ressource essentielle pour les techniciens professionnels et les gestionnaires de flotte.. Nous déconstruirons l'ensemble Ensemble pédale de frein et pédale d'embrayage FAW dans son 22 composants réparables, including the main ‘Pedal bracket’, the ‘Pedal shaft’, the ‘Clutch switch assembly’, the ‘Stop light switch assembly’, and all associated hardware. Comprendre cela Ensemble pédale de frein et pédale d'embrayage FAW is key to diagnosing many braking and shifting issues.

Structure de base: The ‘Pedal Bracket’ (3504031-91W)

The foundation of the entire Ensemble pédale de frein et pédale d'embrayage FAW is the ‘Pedal bracket’ (3504031-91W). C'est le poids lourd, fabricated steel “squelette” that bolts directly to the truck’s firewall. Its function is to provide a rigid, un-flexing mount for all the other components.

This bracket must be incredibly strong, as it has to withstand the full force of a “arrêt de panique,” where the driver may exert hundreds of pounds of force on the brake pedal. Any flex in this bracket would translate to a “spongieux” ou “doux” pedal feel, reducing braking confidence.

This bracket is also the “logique” hub for the pivot system. It is precision-bored to accept the ‘Pedal shaft’ (3504032-50UN). This single, hardened steel shaft acts as the main pivot axle for *both* the ‘Brake pedal assy’ and the ‘Clutch pedal assy’. The pedals pivot on this shaft via the ‘Bushing-pedal shaft’ (3504061-50UN), which is a low-friction, replaceable wear component. L'ensemble Ensemble pédale de frein et pédale d'embrayage FAW is built upon this bracket.

Le “Brake Logic”: Soupape (3514010-50UN) and Pedal (3504070-91W)

Le “Pédale de frein” côté du Ensemble pédale de frein et pédale d'embrayage FAW is a pneumatic control system. The ‘Brake pedal assy’ (3504070-91W) is the steel lever the driver’s foot presses. Lorsqu'il est pressé, this pedal’s primary job is to actuate the ‘Brake valve & connecting head assy’ (3514010-50UN).

This valve is the “logique” of the air brake system. It is a **proportional valve**. It takes the high-pressure (120+ psi) air from the truck’s main tanks and “mètres” it out to the brake lines based on *how far* the driver has pressed the pedal.

• **Pédale 20% pressé:** Valve releases ~30 PSI to the brakes.
• **Pédale 100% pressé:** Valve releases the full 120 PSI for a panic stop.

This proportional logic is what allows the driver to “feather” the brakes. The ‘Return spring-brake pedal’ (3504036-50UN) is a heavy-duty spring that ensures the pedal (and thus the valve) returns to the “zéro” position instantly when the driver’s foot is removed, releasing the brakes. A failed or “sticky” Ensemble pédale de frein et pédale d'embrayage FAW‘s brake valve is a critical safety failure.

Le “Logique d'embrayage”: Maître Cylindre (1602110-76W) and Pedal (1602020-76W)

Le “Pédale d'embrayage” côté du Ensemble pédale de frein et pédale d'embrayage FAW is a hydraulic control system. The ‘Clutch pedal assy’ (1602020-76W) is the steel lever for the driver’s left foot. Lorsqu'il est pressé, it pivots on the ‘Pedal shaft’ and pushes a rod.

This rod actuates the ‘Clutch master cylinder assy’ (1602110-76W). C'est le “logique” of the clutch control. C'est un petit, hydraulic pump. It takes the driver’s mechanical push and converts it into high-pressure *hydraulic* fluid (brake fluid). This fluid is fed from the ‘Clutch master cylinder oil cup assy’ (1602100-50UN), which is the plastic fluid reservoir.

This hydraulic pressure is then sent *out* of the cab, through a hose (voir Assemblée 139), and into the “Clutch Booster.” The booster then uses this small hydraulic signal to control a large *pneumatic* (air) cylindre, which provides the “power assist” to disengage the heavy-duty clutch. A failure of this master cylinder, or air in the line, entraînera une “mort” pedal that goes to the floor, leaving the driver unable to shift. Cette partie du Ensemble pédale de frein et pédale d'embrayage FAW is essential for operating the vehicle.

The Electronic Logic: Commutateurs (3720010-A01 & 3754030-76W)

Le Ensemble pédale de frein et pédale d'embrayage FAW is not just mechanical; it is also an electronic “saisir” system for the truck’s ECU (Unité de commande du moteur).

**’Stop light switch assembly’ (3720010-A01):** This is the brake light switch. It is a simple plunger switch that is activated by the ‘Brake pedal assy’ (3504070-91W) as soon as it is pressed. C'est “logique” is to instantly turn on the truck’s (and trailer’s) brake lights. A failure of this switch is a major safety hazard.

**’Clutch switch assembly’ (3754030-76W):** This is the clutch pedal sensor, mounted on the ‘Clutch switch bracket assy’ (1602250-76W). This switch’s “logique” is vital for the truck’s computer. It sends a signal to the ECU the moment the driver presses the clutch. The ECU uses this signal to:

• Instantly disengage the Cruise Control.
• Instantly disengage the Engine Brake / Jake Frein.
• (On some models) Enable the “start-interlock” (preventing the engine from starting unless the clutch is pressed).
• (On automated models) Signal the engine to briefly cut fuel for a smoother, faster shift.

Scellés, Épingles, et attaches

L'ensemble Ensemble pédale de frein et pédale d'embrayage FAW is designed for a high-vibration, high-use environment. The ‘Sealing gasket-pedal bracket’ (3504033-50UN) is the large foam or rubber gasket that seals the entire ‘Pedal bracket’ (3504031-91W) against the cab firewall, blocking noise, chaleur, and fumes.

The system is held together by a series of fail-safe pins and high-tensile fasteners. The ‘Cotter pin’ (Q436150) and ‘Cotter pin’ (Q5002016) are used on the ‘Clevis pin’ (Q5100825) and ‘Threaded pivot-brake pedal’ (3504062-50UN). Ce “castle-nut-and-pin” logic is a positive mechanical lock, ensuring these critical pivot points can *never* vibrate apart.

‘Hex head flange lock nuts’ (CQ32608) and various ‘Combination bolts’ (CQ1460620) et « Boulons à tête hexagonale’ (CQ1500620) with ‘Spring gaskets’ (Q40306, Q40308) are used to secure all the components to the main bracket. Chaque élément matériel du Ensemble pédale de frein et pédale d'embrayage FAW is a safety-critical, vibration-proof fastener.

FAW Brake Pedal And Clutch Pedal Assembly Parts List

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 22 components identified in the ‘Brake Pedal And Clutch Pedal Assembly’ (541) schéma du tracteur FAW CA4251P66K24T1A3E5.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Ensemble pédale de frein et pédale d'embrayage FAW are defined by its dual-function “logique” as both a pneumatic brake controller and a hydraulic clutch master. Ce Ensemble pédale de frein et pédale d'embrayage FAW is a safety-critical driver interface.