Description
WABCO ABS ECU/VALVE ASSEMBLY (2S/2M – ENHANCED EASY-STOP TRAILER MODULE)
PART NUMBER(S):
Fleet Products: S400 500 1020 (New) | OE (Wabco): S400 500 1020, S4005001020, 4725005211, S4725005211,
DESCRIPTION:
Model: Enhanced Easy-Stop ABS Modulator Valve Assembly (2S/2M)
Engines: N/A (modulator valve – not engine-dependent)
Vehicles:
• Mack trailers (OE Ref: 6300-4005001020)
• Manac trailers (OE Ref: 22801003, 228-01003)
• Peterbilt trailers (OE Ref: S400-500-102-0)
• Compatible with standard trailers equipped with 2S/2M WABCO ABS systems
• Designed for trailers requiring Enhanced Easy-Stop™ ABS performance
Applications:
• ABS relay modulator valve with integrated ECU – used in standard trailer ABS systems.
• Direct replacement for WABCO Enhanced Easy-Stop and TCS II Basic systems.
• Maintains braking stability by modulating brake pressure and preventing wheel lock-up.
• Plug-and-play upgrade/replacement for legacy ABS 2S/2M trailer units.
• Supports TCS II (traction control system) in compatible trailers.
• System Type: 2S/2M (2 sensors, 2 modulators)
• Voltage: 12V
• Max Operating Pressure: 13.0 bar
• Weight: Approx. 4.69 kg
• Includes: ECU (S446 850 600 0) + Dual Modulator (S400 850 602 0)
• Temperature Range: –40°C to +65°C
• Port Threads:
– Control Port: 1/4"-18 NPT
– Delivery Ports: (4) 3/8"-18 NPT
– Supply Ports: (2) 3/4"-14 NPT
• Mounting: Flange-mounted ABS relay valve
CROSS-REFERENCE(S):
S4005001020, S400 500 102 0, TDAS4005001020, 40502932, 10008470, S400-500-102-0, 6300-4005001020, 22801003, 228-01003, 4005001020, 400 500 102 0, 815-4005001020, 650-S4005001020, S-27491, 670-S27491, S27491, 8235-S4005001020, 46040401300, 52733, 3-9350-074, WAB4005001020, TDA-S4005001020, 4005001029, 2ABS00014, RWW4005001020, 170.S4005001020
A cross-reference listing means this part should be a suitable replacement for the part numbers listed. Please confirm all ports and dimensions match your application before installing.
IMPORTANT INSTALLATION NOTES:
ā Designed for standard trailers only (not for steerable or lift-axle configurations without additional sensors).
ā Mounts directly to trailer ABS relay valve bracket points.
ā Professional installation recommended to ensure ABS/TCS accuracy.
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Warranty Information
