BENDIX TCH-013-023 Folheto

 • Roll Stability Program (RSP) to help mitigate vehicle 

rollover events, which typically occur on a dry road 

surface; and
 • Yaw Control to address loss of stability events due 

to vehicle spin, which can occur on a slippery road 

surface, such as wet asphalt, ice, snow, etc.
See Figures 1 and 2 (on page 2) for more information.
The Bendix

®

 ESP

®

 electronic stability system 

continuously monitors a variety of vehicle parameters 

and sensors to determine if the vehicle is reaching a 

critical stability threshold.  If such a situation develops, 

the system will quickly, and automatically intervene to 

assist the driver.  
The system can apply tractor and trailer brakes 

selectively, as well as de-throttle the engine 

automatically (without operator intervention).

The Bendix ESP system uses information from the 

sensors on the vehicle to detect that a risk of a rollover 

is present.  Where the conditions make a rollover likely, 

the system will automatically reduce the engine throttle, 

and if necessary, apply all vehicle brakes — steer axle, 

drive axles(s) and trailer — to slow the vehicle.
Loss-of-Control Interventions

When the Bendix ESP system determines that the 

actual vehicle path is deviating from the driver’s 

intended path, the system will automatically reduce the 

engine throttle, and if necessary, apply one or more 

individual brakes to provide optimal vehicle control.
Stability Event Counters

The Bendix ESP stability system ECU contains 

counters for both rollover and yaw interventions, which 

can be accessed using Bendix

®

 ACom

®

 Diagnostic 

software (version 5.4 and later).  See the Chart below.
By using the ACom Diagnostics, the technician is able 

to display a page that shows counters that indicate 

the number of system interventions.  The intervention 

levels recorded indicate the amount of work performed 

by the system which is, in part, determined by both the 

1

Light system application (typically de-throttle only).  

(The driver may not notice this action.)

The system intervenes to de-throttle.

2

The system intervenes to moderately apply the 

brakes. (The driver may, or may not, notice.)

The system intervenes to de-throttle and/or apply the 

brakes.

3

The system intervenes to moderately apply the 

brakes.

The system intervenes to apply the moderately apply 

the brakes.

4

The system intervenes significantly, but not all the 

braking power available to the ESP system is applied.

Significant braking intervention, but not all the braking 

power available to the ESP system is applied.

5

The system intervenes to apply the maximum braking 

available to the ESP system to try to prevent a 

rollover.

The maximum braking available to the ESP system is 

applied to try to mitigate a loss-of-control.

Notes:  

•  Some vehicle types are typically at greater risk of rollovers/loss-of-control events, including loads with a higher 

center-of-gravity; sloshing or swinging cargo.  Rollovers can potentially occur at low speeds with vehicles of those types.

•  An intervention at any level has the potential of helping to mitigate a rollover/loss-of-control event.

•  Many factors can vary the interventions for vehicles with similar vehicle spec’s: the vehicle’s mass, vocation, route(s); the 

load distribution; the lateral acceleration; the yaw rate detected; the driver’s speed and steering actions.

•  Optimal vehicle braking requires properly maintained foundation brakes which meet appropriate safety standards and 

regulations.  In addition, the vehicle should be equipped with properly sized and inflated tires, with a safe tread depth.