Note
This report is supported for fleets operating in the EMEA region (including UK & Ireland).
The Braking Performance Report (Maintenance > Brake Monitoring) provides a consolidated view of trailer brake health using the Electronic Brake Performance Monitoring System (EBPMS). By analyzing braking behavior under real-world conditions, EBPMS enables proactive maintenance and compliance with regulatory requirements.
The report uses the trailer’s electronic braking system (EBS) data, such as the change in speed over distance and time for each brake event, to evaluate braking performance.
To view braking performance data, trailers must be equipped with the following components:
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AG53 Asset Gateway with an EBS cable
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A compatible Knorr-Bremse, Haldex, or Wabco EBS
The EBS must be programmed to output CAN data
For more information on compatibility and installation, see Electronic Braking System Vendors and Cable Compatibility.
EBPMS evaluates braking performance by comparing brake demand pressure with the trailer’s measured deceleration. Only qualified braking events—those meeting minimum thresholds for speed, braking duration, slope, and brake demand—are included in the braking score calculation.
Trailers receive results based on qualified brake events recorded during the reporting period:
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No Data: No qualified braking activity detected. Verify EBS connection if this persists after trips.
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Gathering Data: Typically, a few hundred braking events are required to calculate a score, but varies based on the brake event characteristics and environmental conditions.
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Pass: Brakes are performing as expected. Continue regular monitoring.
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Pass (7.5 bar): Trailer expected to pass a laden Roller Brake Test (RBT). However, continue monitoring BPV trends for declines.
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Fail: Braking performance has fallen below acceptable thresholds; maintenance action should be taken per internal and regulatory guidelines.
Performance trends are generally steady or show gradual decline as components wear. Promptly investigate any issues stemming from any significant drop in performance.
The braking report displays a summary of trailer braking performance. Use the filters to refine by date, Tags, Attributes, or Braking Result. You can also use Search to quickly locate a trailer.
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Field |
Description |
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Braking Result |
Indicates the trailer’s current braking status— For details on how results are assigned, see Brake Result Interpretation. |
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Name |
Name or identifier of the trailer. |
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Location |
Last reported location of the trailer. |
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Braking Performance |
The Braking Performance Value (BPV) is calculated from qualified braking events over the selected date range. BPV is expressed a percentage of g, where g represents the acceleration caused by gravity, the standard measure of how quickly the trailer slows down during braking. The latest score is updated every six hours. |
You can click any trailer name to view additional braking details.
For each trailer, you can view additional braking information.
Use the date selector in the upper-right corner of the report to generate results for a specific time range, such as a trailer’s inspection cycle.
The report includes the following fields:
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Field |
Description |
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|---|---|---|
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Trailer details |
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Braking Performance details |
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Braking score explanation |
The explanatory panel summarizes how EBPMS evaluates braking performance using qualified events gathered during real-world operation. |
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Performance history graph |
Displays braking performance trends over time. Small variations are normal; sharp improvements typically indicate maintenance. |
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Brake event scatterplot |
Plots qualified brake events by demand pressure and braking efficiency. The regression line represents overall braking performance and can help when comparing BPV projections with roller brake test (RBT) results. |
You can also Download Report for maintenance or recordkeeping.
Configure a Braking Score alert under Asset Readings to notify drivers or maintenance teams when braking performance falls below a specified threshold. For more information, see Alert Configuration.
An EBPMS report produced at each service inspection provides a cost-effective alternative to a laden RBT. However, because the two tests use different methodologies, their results may differ.
EBPMS is a computed projection of braking performance, derived from measured real-world braking data. EBPMS accounts for variations in speed, axle load, and driver inputs. Temporary factors such as short-term tractor influence can affect the results. RBT isolates the trailer and evaluates it under controlled, static conditions.
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In certain scenarios, semi-trailers may be presented unladen for an RBT, with wheel locking being relied upon to achieve a pass. Figures from an unladen test only record the retardation at the point of wheel locking, whereas real-world performance may differ. In contrast, trailers monitored by EBPMS are typically laden during normal operation. As a result, the performance figure obtained during an unladen RBT cannot be compared directly to the performance result produced by an EBPMS. Trailers presented loaded with at least 65 % of their maximum bogie load yield more accurate RBT results.
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Pressure to the trailer brakes is typically not restricted during an RBT. Tractor units can deliver up to 8.5 bar, which means a trailer with poor-performing brakes may still pass an RBT if the pressure exceeds the 6.5 bar test figure. For a more meaningful comparison, limit RBT demand pressure to 6.5 bar. Alternatively, review the Brake Performance Report results at both 6.5 bar and 7.5bar to better evaluate with higher-pressure braking performance. Additionally, the brake event scatterplot shows brake efficiency at various pressures.
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RBTs often bypass the trailer’s EBS load-sensing function, which normally modulates braking force based on load. To confirm correct operation, the measured trailer axle load at the time of a laden RBT should be compared with the vehicle weight recorded by the RBT’s scale. Trailers should be tested with a load of at least 65% of their maximum bogie load.
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The performance reported by an EBPMS is an average over a period and reflects the trailer-tractor combination, not the trailer alone, so any actions should take into consideration both the average performance and any short-term influence of the tractor on the reported performance. Tractor units include a provision to adjust the combined braking balance, often referred to as brake predominance, which should be considered when troubleshooting poor or over-performing brakes.
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