EBPMS | Electronic Braking Performance Monitoring System

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Electronic Brake Performance Monitoring Systems (EBPMS) provide a dynamic, data-driven approach to monitoring trailer braking systems. By calculating a Braking Performance Value (BPV), EBPMS ensures compliance with safety standards while enhancing operational efficiency and safety.

How Does EBPMS Work?

EBPMS continuously monitors braking performance during normal vehicle operation by capturing real-time braking data. This data is processed and analysed to assess braking efficiency and compliance.

Data Collection and Transmission

• Trailer ECU: EBPMS data is extracted from any trailer ECU that supports T-CAN data.
• Telematics Unit: A telematics device installed on the trailer collects and transmits braking data to a cloud-based service.
• Cloud Processing: The cloud system processes the raw data, calculates the Braking Performance Value (BPV), and compiles historical performance records.
• Online Portal: The results, including BPV calculations and historical braking performance trends, can be accessed via an online portal. Operators should retain this data for compliance and maintenance purposes.

What is the Braking Performance Value (BPV)?

The Braking Performance Value (BPV) is a predictive measure of braking efficiency, representing the braking effort a trailer is capable of achieving at the maximum demand pressure of 6.5 bar.

BPV is expressed as a percentage of gravitational acceleration (9.81 m/s²), indicating the trailer’s braking force relative to its weight. To meet compliance standards, the BPV must be 45% or greater.

How is BPV Calculated?

Braking Event Data Collection

EBPMS continuously records braking events during normal operations, capturing key metrics in real time, including:

• Demand Pressure (bar): The air pressure applied to the braking system, typically ranging from 1-2 bar during normal braking.
• Deceleration (m/s²): The system calculates deceleration by measuring speed over time using wheel speed sensors. This determines the rate at which the trailer slows down.
• Axle Load (via suspension air bag pressure sensor): Measures the weight distribution across the axle set (bogie) during braking.
• Road Gradient: Identifies whether the vehicle is on a slope, ensuring braking effort is assessed accurately.

Data Analysis and Extrapolation

• Trend Establishment: Each braking event provides a set of data points. The system evaluates these to determine a trend of braking effort against demand pressure.
• Prediction Line: A predictive curve is generated from the data, starting at 0 bar and extending to the maximum 6.5 bar demand pressure.
• BPV Calculation: The BPV is determined by extrapolating the braking effort to 6.5 bar, providing a reliable measure of the trailer’s braking performance under maximum demand conditions.

Why EBPMS is Essential

Enhanced Safety

• Real-time monitoring ensures early detection of braking inefficiencies, reducing brake-related risks.

Operator Compliance

From April 2025, the DVSA requires fleets to:

• Conduct four laden Roller Brake Tests (RBTs) annually, or
• Perform one annual RBT, supplemented by EBPMS data.

Operational Efficiency

• Provides actionable insights to predict maintenance needs, minimise downtime, and keep vehicles operational.