Auto Service Professional

FEB 2018

Magazine for the auto service professional

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24 | ASP February 2018 Technical cable release under the center console. e cable puller design has been popular and is still being used, but the caliper-integrated design has gained popularity and its simplic- ity will likely make it the favorite. e caliper-integrated design incorporates a bidirectional electric motor on each caliper. is electric motor mechanically forces the caliper piston out to provide the necessary clamping force on the rotor. Most systems will use a gear reduction drive to provide the needed force with a small electric motor. ere are several advantages to the caliper- integrated EPB design setup. It eliminates the need for brake cables and the hardware and packaging they require. Another advantage is that the vehicle manufacturing process is streamlined requiring only one hydraulic and one electrical connection on each rear-brake assembly. An added advantage is weight reduction. One manufacturer claims it saves as much as 16 pounds on a full-size SUV/pickup. Reducing vehicle weight, reduced emissions and increasing fuel economy is a common theme in today's automotive world. e will be CAN networked, allowing integration into other on-board systems. e caliper-integrated EPB system is commonly used on Volvo, VW, Audi, Ford F-150, Honda and many others. Space saving is another advantage to the EPB system. e area that was devoted to a pedal assembly or a parking brake handle unit in the traditional hump area, foot well, and center consoles, can now be used for other things. Some manufacturers claim there's increased occupant safety by the removal of the handle or pedal assemblies during a collision. But the gains in safety don't just stop there. It can function completely automatically (without driver input), applying and releas- ing the parking brakes as needed when the transmission is put in park or, in a vehicle with standard transmission, when the key is turned to the off position. It can apply the parking brake if the driver's door is opened, if the driver's seat belt is undone, or if the trunk or hood is opened. It can also be used as a hill holder to prevent the car from rolling back at a stop sign. Furthermore, it can be incorporated with the anti-lock braking system (ABS) to provide low-speed traction control, or be used as an immobilizer, locking the wheels when the vehicle is parked, and the ignition is off. And in the event of a hydraulic brake failure, it can bring the vehicle to a stop — much like an ABS stop — without the rear wheels locking up and causing a spin-out. e EPB could also be tied into the rear backup camera and apply the brake if the camera detects an obstacle. In both designs, the EPB module will control the action of the bidirectional cable motor or caliper motors that apply the clamping force. e EPB module will monitor These are all examples of the EPB switches on older and newer ve- hicles. From top: the EPB switch on the 2016 F150, the EPB switch on a 2016 Cadillac CTS and the EPB switch on a 2010 VW Passat.

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