Disconnect the bleeder unit for the brake fluid

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NOTE: RISK OF DAMAGE
Paint damage.
Mechanical or chemical action may lead to paint damage.

Cover up working area with specified covering material only.

Switch off bleeder unit (1) and remove it from the brake fluid expansion tank.
Check the brake fluid level and adjust it to the maximum mark if necessary.

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Check the seal of sealing cap (1) for correct fit and damage, replace if necessary.
Shut sealing cap (1).

Courtesy of BMW OF NORTH AMERICA, INC.