It is always a good idea to replace front calipers in pairs on German autos, especially if one front caliper has failed. If both calipers are the same age and in similar poor condition, replacing only one caliper can create a side-to-side braking imbalance and steering pulling. German autos are considered high-performance vehicles and should always be repaired to meet original design standards and the driver's expectations.
When to Replace Both Calipers
If one front brake caliper is sticking, seized, leaking, or damaged, replacing both calipers is often the best repair, with fewer problems, greater brake performance and safety, and greater customer satisfaction. If you want smooth brake performance, an even braking feel, the best braking power, and to avoid brake pull, replacing both front calipers together is strongly recommended.
When Replacing One Caliper May Be Acceptable
If the opposite caliper has clearly been recently replaced or is in very good condition, some auto technicians will replace only the bad side and service the pads, rotors, and fluid as needed. This can be reasonable for budget reasons, but there is a risk that the reused caliper may fail later or that its brake performance may differ from that of the new caliper, causing brake-pulling issues.
Practical Best Practice
If the vehicle has high mileage, heavy rust issues, or is driven hard, replacing both calipers is usually the safer long-term choice.