Designed to consistently maintain optimum brake lining-to-drum clearance, Haldex's ABAs help reduce stopping distances and increase driver control.
Temperature, stability and drag must be managed properly
While Haldex has not recently introduced any new technology for the school bus industry, Corbett believes some of the company’s newer systems will eventually transition into the school bus market.
“We have a new system called TRS [trailer rollover stability system]. It’s an antilock braking system and roll stability in one unit,” he says. “I think down the road probably a roll-over type system [will be available for school buses].”
The TRS adjusts for trailer conditions during normal and antilock braking system (ABS) events. In the case of a rollover, the system will act accordingly by applying the service brakes to slow and stabilize the trailer.
“I think you’re going to see the government mandate these types of systems [for school buses],” Corbett adds.
Smartbrake systems are built for endurance, Phillips says. Each is built with materials that can withstand heat and longterm stress.
“Our newest system is called our Air-Set Smartbrake,” Phillips explains. “It provides powerful secondary braking, rapid engine warm and maintains a constant engine temperature.” The system also maintains pressure as suggested by the engine manufacturer.
Oil-tempered silicon chrome springs and stainless steel push rods are some of the materials used in Smartbrake systems to ensure durability.
“The primary braking is so important for the safety of the students,” Phillips adds. “I think that there should be more engine braking regulation to increase the safety.”
ABS signal ring failure can be prevented by Performance Friction’s “Zero Failures” brake disc, which lowers the temperature of a system engaged in braking. In doing so, it lessens the amount of thermal deformation of the ABS signal ring.
“This has been shown in the field to completely eliminate premature ABS signal ring failure,” Mohr explains. “This problem is very costly for all school bus fleets and manufacturers.”