Cheap BMW 4 Series Brake Servo

Yes, all variants of the BMW 4 Series (F32/F33/F36 first generation 2013–2020, and G22/G23/G26 second generation 2020 onwards) are fitted with a brake servo as standard, as they use conventional vacuum-assisted braking systems on the vast majority of engine variants. The exception worth noting is any fully electric or plug-in hybrid variant where a conventional vacuum brake servo may be replaced by an electric brake booster — confirm with your breaker which system your exact registration uses if you are unsure. For the vast majority of petrol and diesel 4 Series, a traditional brake servo is present and is a genuine used part worth sourcing.

Both years fall within the first-generation F32/F33/F36 4 Series (2013–2020), so there is a reasonable chance of compatibility, but you should confirm with the breaker against your specific registration as mid-generation engineering changes — including possible brake system updates — cannot be ruled out. Engine size matters here too, as larger-engined variants such as the 440i may use a different servo specification to a 420d or 418i. Always give the breaker your full registration so they can cross-reference the correct part.

This crosses a generation boundary and fitment is very unlikely — the F32 and G22 are entirely different platforms with different braking system architectures, so the servo mounting, vacuum connections and proportioning are not expected to be interchangeable. You should confirm the exact part numbers with your breaker against both registrations before purchasing. Do not assume cross-generation compatibility even if the engine size is similar.

Trim level does not affect which brake servo is fitted — a Sport, M Sport, or Luxury 4 Series with the same engine size and generation will use the same servo. What does matter is the engine variant, since a higher-output engine such as the 440i or M440i may be paired with a larger braking system than a 420i or 420d. Confirm the engine size with your breaker rather than worrying about the trim badge.

Yes, engine size can influence brake servo specification because larger, more powerful engines are typically paired with uprated braking systems that may require a correspondingly rated servo. A 440i or M440i is more likely to differ from a 420i or 418i than two similarly-engined cars would from each other. Always tell your breaker your exact engine variant as well as your registration to make sure the servo they supply matches your setup.

The Gran Coupe (F36 in the first generation, G26 in the second) shares its running gear and braking system with the equivalent coupe body style in the same generation, so body style alone does not change the brake servo specification. What matters is the generation and engine size, not whether your car is a two-door coupe, convertible, or four-door Gran Coupe. Confirm with your breaker using your registration to be certain.