Technician A is correct. When working on an electronic e-brake, it may be necessary to have a scan tool to put the system into service mode for brake pad replacement or other maintenance. This allows the caliper piston to retract safely without damage.
Technician B is also correct. Some vehicles offer the option to put the electronic e-brake into service mode through the driver information center, often accessed via the vehicle’s infotainment system menus. This method eliminates the need for a specialized scan tool for certain models.
Modern electronic e-brakes are computer-actuated. To service them, you cannot simply use a C-clamp to push the piston back, as this will damage the caliper. Instead, you must retract the caliper electronically. This can be done using a scan tool (like a Bosch) or, on some vehicles, through the driver information center (e.g., a Uconnect system on a Dodge).
The process involves putting the system into a “service mode” to retract the piston, performing the brake job, and then resetting the system to activate the parking brake. Always follow the specific service manual instructions, as procedures may vary by vehicle. Both technicians A and B are correct in stating the necessity of a scan tool and the possibility of using the driver information center, respectively, making the answer C. This knowledge is crucial for the A-5 ASE exam.
Electric E Brake
