EBS 3.3 brake control unit CM DAF XF CF

The control unit EBS DAF 2120800 is an electronic module that manages the electronic braking system fitted on DAF commercial vehicles. It is associated with the WABCO EBS3.3 CM system and functions as the central control unit for electronic braking, managing the interaction between the brake pedal, wheel sensors, pneumatic modulators, the vehicle CAN network, ABS/ASR/ESC functions and trailer braking control where applicable.

The component is essential for the vehicle's active safety, as it processes the driver's deceleration request and commands braking pressure more quickly and accurately than a purely traditional pneumatic system. In case of failure, the vehicle may retain an emergency braking or degraded mode, but with partial or total deactivation of functions such as ABS, ASR, stability control, electronic brake force distribution or EBS pressure management.

Technical specifications

• System: EBS3.3 CM.
• Component type: EBS electronic control unit for commercial vehicles.
• Nominal voltage: 24 V.
• Dimensions: approximately 180 x 134 x 45 mm.
• Indicative weight: about 0.466 kg.
• Protection class: IP30.
• Temperature range: from -40 °C to +80 °C.
• Installation: protected area of the vehicle, generally not directly exposed to water, road dirt and atmospheric agents.

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

Functions

• Electronically manages the braking request from the brake pedal.
• Calculates the required braking pressure based on load, speed and the vehicle's dynamic conditions.
• Commands the front and rear pneumatic modulators to regulate pressure to the brake chambers.
• Integrates the ABS function, preventing wheel lock-up during braking.
• Manages the ASR or traction control function, intervening in case of driven wheel slip.
• Coordinates electronic distribution of braking force between the front axle, rear axle and any trailer.
• Can communicate with the ESC system, where present, for directional control, yaw control and rollover stability functions.
• Contributes to the management of combined braking with retarder, engine brake and other deceleration systems.

Application models

• DAF CF/XF

Typical faults

• No communication/diagnosis with the ESP control unit possible
• Loss of complete functionality, intermittent or permanent
• Detected incorrect battery voltage value

Error codes:
060601 - Unit A10B detected under-voltage or short to ground
060604 - Unit A10B detected under-voltage or short to ground
18F0FF - ESP function limitation
220303 - Short to positive, ABS solenoids left/right front axle
730201 - The power supply of unit A10B is too low
75020C - Internal fault

Final conclusions

The EBS DAF 2120800 control unit is a very important electronic safety component for DAF commercial vehicles equipped with the EBS3.3 system. Its role is not limited to brake management but includes coordination of ABS, ASR, pressure distribution, stability, wheel sensors, pneumatic modulators and electronic communication with other vehicle control units.

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