19
Brake Bleeding - Stephen Karlan (Dali Meeow)
R1100 and R850 yearly maintenance requires replacing (by bleeding) the brake fluid.
RECOMMENDED FLUIDS
Use only fluids from a new, never-been-opened container. The manual calls for: BMW DOT4,
Castrol Disc Brake, DOW ET 504 Shell Donax DOT 4, Hydraulan DOT 4. None of these is a
synthetic. Use the recommended fluids. Synthetics (DOT 5) are not approved and may not be
compatible with the R1100.
WARNING: Brake fluid wrecks (eats) paint immediately and must NOT come in contact with
any part of your bike!!!
Place bike on center stand for easiest access. The front brake reservoir is located on the right
handlebar and is part of the brake casting. The reservoir top measures 2-inches x 1 7/8-
inches and is held on with four screws; rotate and secure the handlebar so that the top is level.
Protect the bike with a large plastic garbage bag under the front reservoir and the right front
bike area; place paper towels or rags on top of the plastic to capture any brake fluid that
escapes. The rear reservoir is a clear plastic bottle located on the right rear of the bike; you
must remove the side fairing piece to see it. When working with the rear reservoir, the right-
side plastic fairing parts must be removed and a plastic bag may be taped so that it is held
behind the reservoir and drapes down to protect the area where fluid might leak from the rear
reservoir.
WARNING: Maintain fluid in the reservoir at all times (do NOT allow air into the brake lines)!!!
METHOD ONE:
Mityvac(r) is a hand-held vacuum pump that attaches to the bleeder valve on the caliper and
pulls brake fluid from the reservoir, through the brake line and nipple, into a plastic line and
deposits the fluid into a cup built into the tool. There is a plastic model (Part NO. 7000) and a
metal model. The plastic version is available from some WalMart Stores for approx. $25.
Metal models cost about $60 and are available from Mac Tools (part number MV4000) and
Snap-On Tools (private vendors who sell to auto repair shops and may be found in the
telephone book), and from Imparts at 1-800-325-9043, part number 29900. Sears also sells a
vacuum pump (about $35) and a brake bleeder kit (about $10) which work well.
A Mityvac(r) vacuum pump tool is designed for bleeding brakes; read the Mityvac information
you receive with the tool. If you are not using a Mityvac or similar tool, the difference will be
explained in the paragraphs under Method Two. Both methods will yield the same excellent
result if performed properly.
Replace the fluid in the handle-bar mounted reservoir by using a turkey baster or other device
to get the old fluid out and then refill with new fluid, and do the same with the reservoir under
the seat on the right side of the bike. (Protect your paint and use something (cup/paper/rags)
to catch the drips from the turkey baster, because the turkey baster will drip.) Fill the
reservoirs with one of the recommended fluids. Now follow the cycle of the four basic steps.
Cycle of four basic steps: (1) Create suction at the bleeding nipple which is on the caliper, (2)
Drain most of the fluid from the reservoir by opening the bleeding nipple , (3) Close the
bleeding nipple while fluid is STILL COMING OUT and BEFORE the reservoir is empty, (4) Add
(16 pages)
(30 pages)
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