The maintenance of modern electronic parking brakes (EPB) often requires specialized tools and procedures. Many car owners and mechanics wonder if a standard over-the-counter (OTC) scan tool can handle the job. This article explores the different methods of servicing an EPB, specifically focusing on whether an OTC scan tool is sufficient.
While the official Subaru service manual suggests using the Subaru Select Monitor for EPB service, it also provides an alternative method involving a special tool to manually retract the caliper piston. This tool, with two pins to engage and rotate the piston, allows for manual retraction without electronic intervention. Using an angle grinder with a compatible two-pin adapter can achieve the same result.
However, caution is advised against methods involving removing the rear cover of the EPB motor and manually unwinding the piston. This practice is not recommended by the manufacturer and could potentially damage the delicate internal mechanisms.
Another method involves applying power directly to the brake connector to retract the piston. While this might be useful in situations where a rotor ridge prevents caliper removal, it should be approached with caution. It’s important to consult the vehicle’s specific service manual for the correct procedures and voltage requirements.
Furthermore, forcing the brake pad with a screwdriver, a common practice with traditional brakes, is not recommended for EPB systems. The electronic components and delicate mechanisms within the caliper assembly could be easily damaged.
After completing the service, it’s crucial to cycle the electronic parking brake several times (typically five) to allow the system to recalibrate and ensure proper function.
In conclusion, while an OTC scan tool might offer some diagnostic capabilities for the EPB system, it’s often insufficient for complete service. Specialized tools or procedures, as outlined in the vehicle’s service manual, are usually required for tasks such as piston retraction. Always consult the manufacturer’s recommendations for the specific make and model to ensure safe and effective EPB service.
