Trailer Brake Modulator 4801020330

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

The code 4801020330 is a WABCO trailer EBS modulator (Trailer Modulator), belonging to the TEBS E (Trailer Electronic Braking System - E) family, Premium version with PEM (Pneumatic Extension Module).

Technical features

• Type: TEBS (Trailer Electronic Braking System) electronic trailer braking modulator
• Platform: TEBS E with PEM (Pneumatic Extension Module)
• System configuration: 4S/3M (4 wheel speed sensors / 3 modulation channels)
• Voltage: 24 V
• Operating temperature: -40 °C / +65 °C
• Protection: IP6K9K
• Maximum operating pressure: about 8.5 bar (typical value declared as ~123 psi)
• Mounting hole spacing: 70 mm
• Approximate dimensions: 224 × 259 × 198 mm
• Approximate weight: about 7.0 kg

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Functions

• Electro-pneumatic modulation of trailer braking in TEBS logic
• Management of wheel speed sensor signals (trailer ABS) and control of modulation channels (3M)
• Interface with the trailer network (TEBS E functions) and management of diagnostics
• Safety strategies and degraded modes in case of anomaly (power supply, communication, sensors, outputs)

Model applications

• Trailers and semi-trailers that mount a TEBS E unit in 4S/3M configuration.

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 code 4801020330 is the WABCO trailer EBS modulator. Technically, it is a TEBS E Premium with PEM (Trailer Electronic Braking System with Pneumatic Extension Module) in 4S/3M configuration.

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