Q. I have a 2021 BMW X5. I’ve been changing my own brakes, as well as family members’ brakes, for 45 years. I would like to replace the brakes on my BMW, but from what I have read, I need a scan tool to put the vehicle into service mode. Is there a way around it? If not, do you recommend an inexpensive scan tool?

A. Some people use a Power Probe or apply power and ground directly to the electronic parking brake motors to retract the calipers. In my opinion, that’s not the best approach. While it may work, there is a risk of retracting the mechanism improperly and potentially damaging the gears or motor assembly. The proper method is to place the electronic parking brake system into service mode with a scan tool. If you are looking for a BMW-specific tool, Ancel offers models for around $100 that can perform this function. If you want a scanner with broader vehicle coverage and additional diagnostic capabilities, the Innova 5610 is a good choice. It’s the scanner I keep in my own vehicle, and I’ve seen it priced as low as $260 from major online retailers. For someone who has been servicing brakes for decades, investing in a scan tool is money well spent. It not only makes brake service easier, but it also gives you access to service functions and diagnostic information that are becoming increasingly important on modern vehicles.

Q. I have an issue with a battery maintainer/charger. About four or five years ago, you recommended the Battery Tender for trickle charging batteries. I have used those chargers on my cars with good results. On my 2016 Toyota RAV4 with the........

© The Saratogian