EBS Group Trailer Wabco 4801041060

Typical Defects:
No communication/diagnosis with the ESP control unit possible
Loss of full functionality, intermittent or permanent
Detected incorrect battery voltage value

The OE code 81521066071 identifies a WABCO axle EBS modulator of the second generation, used as an electro-pneumatic unit for brake pressure regulation on the axle (typically the drive axle). It is a “hybrid” component because it integrates the pneumatic part (inlet/outlet valves, exhaust, redundant lines) and the electronic part (control and diagnostics), communicating on the vehicle network with the EBS/ECU and managing sensors and actuators connected to the axle.

Technical features

• Type: EBS Axle Modulator 2-Channel – Gen2 (2-channel axle modulator)
• Application configuration: Drive axle 2S/2M/4W (2 wheel speed sensors, 2 modulation channels, 4 wheels)
• Power supply: 24 V
• Nominal current: 10 A
• Maximum operating pressure: 12.8 bar
• Protection rating: IP6K6K/IP6K9K
• Temperature range: -40 °C / +80 °C
• Mounting and dimensions: Bolt spacing: 100 mm; Connections: 2x M12x1.5; Indicative dimensions: 222 x 154 x 139 mm; Indicative weight: about 3.05 kg

DIPA can intervene to overhaul these components thanks to its experience and expertise.

Functions

• Electro-pneumatic regulation of brake pressure on two channels of the axle with ABS/traction control management based on EBS commands
• Acquisition and use of signals from the wheel speed sensors connected to the axle
• Control with safety and redundancy logic in case of loss of the electronic command or degraded conditions
• Diagnostic integration (electrical/pneumatic faults) and communication on the vehicle network (CAN) with the EBS ECU
• Management of inputs for brake pad wear sensors
• Provisioning/management of trailer-related functions in specific configurations (dedicated interfaces in the module connector, according to installation)

Model applications

• Trailers applied to MAN series TGL/TGM/TGL/TGS

Common faults

• Unstable pressure on the lines
• The system is detected by the diagnostic tool erratically
• The diagnostic tool detects unstable voltage
• Warning light on the instrument panel

Final conclusions

The WABCO OE 81521066071 is a second-generation 2-channel axle EBS modulator, typically for the drive axle in 2S/2M/4W configuration mounted on MAN series TGL/TGM/TGL/TGS vehicles.

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