Used BMW i3 Brake Servo

No — the BMW i3 does not have a conventional vacuum brake servo. Because the i3 is a fully electric vehicle with no combustion engine, there is no engine vacuum to power a traditional servo; instead, BMW fitted an electro-hydraulic brake booster (sometimes called an iBooster or electrohydraulic brake unit) that performs the same function electronically. If you are searching for the brake-boosting component on an i3, you need to ask breakers for the electro-hydraulic brake booster or brake control unit, not a brake servo.

The part that replaces the conventional brake servo on the i3 is an electro-hydraulic brake booster, often referred to at breakers as the brake booster, iBooster, or electrohydraulic brake unit. It integrates with the i3's regenerative braking system, so it is a more complex assembly than a traditional servo. When contacting a breaker, describe it as the electro-hydraulic brake booster and give your registration so they can confirm the exact unit.

The BMW i3 was launched in 2013 and received a significant update around 2017, with the range running through to 2022; there were also battery capacity upgrades across this period that could affect the brake control calibration. Because the electro-hydraulic booster talks directly to the car's control modules, compatibility across the pre-facelift and post-facelift cars is not guaranteed even if the units look similar. Always confirm the part number against your registration with the breaker before buying.

The i3s, introduced in 2017, has a more powerful motor and different suspension tuning compared to the standard i3, and the brake system calibration may differ accordingly. While the two variants share the same basic electro-hydraulic booster concept, the specific unit fitted may not be identical, so trim and performance variant do matter here — unlike purely cosmetic trim differences. Confirm the exact part number with the breaker using your vehicle's registration to be sure you get the right unit.

The i3 Rex carries a small petrol range-extender engine in addition to the electric drivetrain, but both Rex and fully electric i3 variants still use an electro-hydraulic brake booster rather than a vacuum servo, so the fundamental type of part is the same. However, differences in vehicle weight distribution and software calibration between the two variants mean the specific units may not be a straight swap. Check the part number carefully and confirm compatibility with the breaker against both the donor and recipient registrations.

It is likely a mislabelled listing; the BMW i3 was never fitted with a conventional vacuum brake servo at any point in its production life. The part the breaker almost certainly has is the electro-hydraulic brake booster, which performs the equivalent function but is an entirely different component. Ask the breaker to confirm the exact part description and part number, and check it against your registration before purchasing.