Observe use-by date on the sealant container.
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BMW X3 Service & Repair Manual > Rear brakes: Replacing rear left or right dust boot on brake caliper
Necessary preliminary tasks:
Remove rear BRAKE PADS.
NOTE: Dust boot can be replaced without dismantling the brake caliper and without
removing the piston.
Use original BMW repair kit.
When the repair work is complete, please pay attention to the following:
Check brake pads ...