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00 00... Brake And Clutch Hydraulic System: Checking Fluid Level, Topping Up If Necessary

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Brake fluid is toxic. Keep brake fluid off painted surfaces of vehicle as brake fluid will damage the finish.
Fig 1: Checking Fluid Level In Expansion Tank
G03117639Courtesy of BMW OF NORTH AMERICA, INC.

Check fluid level in expansion tank; if necessary, top up brake fluid to Max. marking (1) (refer to OPERATING FLUIDS - BRAKES ).

CAUTION: If the fluid level in the expansion tank has dropped to the Min. marking (2), this means that either the brake pads are worn or the brake system is leaking. It is not enough merely to top up the brake fluid. It is absolutely essential to identify what has caused the brake fluid level to drop.
NOTE: It is absolutely essential to rectify any identified faults after consulting the customer and to issue a separate invoice.