BMW R850 Maintenance Manual page 37

Check the Brake Fluid Level: Check the level of the brake fluid in the reservoirs and
top off to the maximum fill line with DOT 4 brake fluid. You should plan on changing the
brake fluid at least once each year, regardless of mileage. BMW specifies that when
changing brake fluid or flushing the system the front (but not the rear) caliper pistons
need to be recessed fully back into their bores. This is so fluid is forced out of the
caliper cylinders and stale fluid is not trapped in the calipers. BMW specifies a special
tool to retract the pistons. If you are careful not to damage the pads, you can retract the
pistons with tapered wedges which should be left in place during the flushing operation
to hold the pistons in the retracted position. Despite the fact that there are bleed nipples
on the ABS system under the fuel tank, my Repair Manual only calls for bleeding the
entire system at the wheel caliper bleed nipples.
Renew the Spark Plugs: The spark plugs should be replaced at the Major Service
interval.
OTHER COMMENTS:
During both a major or minor service you should take the opportunity to thoroughly
inspect your motorcycle. When you have the fuel tank removed, for example, is an
excellent opportunity to examine electrical connections for signs of corrosion or wear,
and to examine other parts and pieces hidden beneath the tank or behind the body work.
Look for loose or worn fasteners. Get to know exactly what the various components are
supposed to look like. Be systematic. Use good tools. Allow plenty of time - several
hours at least - and go slowly and carefully. Do not get in "over your head" and if you
do, consult your dealer or some other person experienced with R1100 maintenance.
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