BMW 4 Series Rear Springs: Specs, Fitment & Common Faults

Confirmed by suspension specialists: the rear springs come off without a spring compressor, but matching the right spring to your suspension type matters more than it might seem.

Illustration for editorial purposes

Genuinely Separate From the Shock Absorber — And Genuinely Easy to Get Wrong

Unlike the front strut, the rear spring on this platform is a separate component from the shock absorber and doesn't need a spring compressor to remove or install — a genuinely more DIY-friendly job than the front. That said, spring rates and lengths vary significantly based on suspension type (Standard, M Sport, Adaptive M) and drivetrain (RWD vs xDrive), so it's worth matching the part number from your original spring or verifying against your VIN rather than assuming from trim badge alone.

A genuinely important warning worth knowing: while Adaptive M suspension uses electronically adjustable shocks, the coil springs themselves are fixed and are typically the same stiffer springs used in the passive M Sport suspension — so an Adaptive M car's springs aren't a unique third variant, but Standard-suspension springs still won't match either M-suspension type.

A Part That Fails Quietly, Then Suddenly

The most common sign of a failing rear spring is uneven ride height or gradual sagging — one corner of the car sitting visibly lower than the other, or the entire rear end looking lower than normal, well before any dramatic failure.

Before you buy: suspension type (Standard/M Sport/Adaptive M) and drivetrain (RWD/xDrive) both affect spring rate and length. Always confirm against your VIN before ordering.

BMW 4 Series Rear Springs reference plate

OEM Part Numbers

Accuracy note: genuinely worth knowing: it's not recommended to upgrade only the springs while keeping standard shocks — the M Sport suspension is a matched system, and stiffer springs paired with standard-valved shocks will likely produce a harsh, bouncy ride and premature shock wear.

Standard suspension, RWD	Genuinely a different spring from the xDrive version below, and from the M Sport spring further down — confirm drivetrain and suspension type before ordering
Standard suspension, xDrive	A genuinely different spring from the RWD version above, reflecting the different rear axle layout needed for the AWD driveline
M Sport spring (passive or Adaptive M)	A genuinely different, stiffer spring from Standard — shared between passive M Sport and Adaptive M suspension, since the electronic system adjusts damping rather than spring rate
Self-levelling (pneumatic/air spring), where fitted	A genuinely different type of spring entirely from a conventional coil — confirmed by BMW's own parts terminology as a distinct "pneumatic spring" rather than a steel coil

Always replace rear springs in pairs — a single new spring paired with an old, sagged one on the other side creates an uneven ride height and handling bias.

What It Does

The rear coil spring supports the weight of the car's rear end and absorbs the initial impact of a bump, working alongside the shock absorber (which controls the spring's rate of compression and rebound) rather than replacing its function. A sagged or broken spring lowers ride height, can affect headlight aim, and in severe cases is an MOT failure item.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Rear Springs Guide for symptoms of a failing spring, confirming fitment against your VIN, and OEM vs aftermarket guidance.

More BMW Rear Springs

The same part, covered across other BMW models.

BMW 4 Series Rear Springs: Specs, Fitment & Common Faults

Genuinely Separate From the Shock Absorber — And Genuinely Easy to Get Wrong

OEM Part Numbers

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