Heavy Duty: Vehicle Stability Systems

Stability and rollover systems: Can your fleet afford NOT to have these?

“One is an extra air line going to the suspension air bags—so you’re monitoring the leveling valve, so the maintenance of that is the same as with any other air line,” Stocksdale says. “And there’s an internal accelerometer, and the only thing you’re going to get if it fails is a diagnostic code, so there’s really no maintenance. It installs pretty much the same; has to have a little bit more rigid surface to install because of lateral accelerometer performance, but as far as air line hookups and things like that, it’s pretty simple.”

Bendix Electrics marketing manager Fred Andersky said maintenance of their systems is also basic.

“We’re using the same wheel speed sensors, the modulators, traction control valve—so the components you would be repairing for your ABS system are the same components used in the ESP,” Andersky says.

Technicians will need to recalibrate the steer angle sensor any time they do a front-end alignment, though, and the yaw sensor must also be recalibrated if moved.

“You cannot re-position that yaw rate sensor,” Andersky says. ”Not so much an issue on tractors, but on construction vehicles, a body builder will get the chassis in and put on their mixer body and they say, ‘Hey, what’s this black box doing here in the way of my plumbing?’ so they move it, and then can’t understand why they are getting these brake interventions. Do not touch, do not move, and there are labels around it.”

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