BMW Z4 rear spring replacement DIY guide.
As you can see this spring has seen better days, the bottom piece has broken completely off.
Remove the rear wheel.
See here the bottom of the spring is missing.
Use a jack or similar and support under the rear hub, this will stop the hub from firing down when you remove the lower shock absorber bolt.
Undo the lower shock absorber bolt.
Lower the jack from under the rear hub and pull/lever down on the rear hub and pull out the broken rear spring.
Here you can see the difference between old and new.
Pull down/lever down the rear hub and fit the new spring.
Jack up the rear hub and fit and tighten the rear shock absorber bolt.
Refit your wheel and torque up the wheel bolts. Job done.