General Informations About Ktm Disc Brakes - KTM 640 LC4 Adventure Owner's Manual

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MAINTENANCE WORK ON CHASSIS AND ENGINE

General informations about KTM disc brakes

BRAKE CALIPERS:
The brake calipers of this series "float". This means that the brake calipers
are not solidly attached to the caliper support. Thus, the brake pads are always
in optimum contact with the brake disc. Secure the screws of the caliper sup-
port with Loctite 243 and tighten to 25 Nm (19 ft.lb).
FOR SAFETY REASONS, ALWAYS HAVE MAINTENANCE WORK AND REPAIRS TO THE
BRAKE SYSTEM PERFORMED BY AN AUTHORIZED KTM WORKSHOP.
BRAKE PADS:
The brake pads are fitted with TOSHIBA TT2701HH sintered lining at the
front and TOSHIBA TT2161FF sintered lining at the back. These linings pro-
vide an optimal combination of dosing, brake performance and life cycle. The
lining type is stated on the back of the brake pad and also recorded in the
homologation papers.
BRAKE SHOES AVAILABLE IN THE ACCESSORY TRADE ARE OFTEN NOT AUTHOR-
IZED FOR OPERATION OF YOUR KTM MOTORCYCLE IN ROAD TRAFFIC. THE BRAKE
SHOE'S DESIGN AND FRICTION FACTOR AND THEREFORE THE BRAKING POWER
CAN DEVIATE SIGNIFICANTLY FROM ORIGINAL KTM BRAKE SHOES. IF YOU USE
DIFFERENT BRAKE SHOES THAN THOSE PROVIDED WITH THE ORIGINAL EQUIP-
MENT, IT CANNOT BE WARRANTED THAT THEY ARE AUTHORIZED FOR USE IN ROAD
TRAFFIC. YOUR MOTORCYCLE WILL NOT LONGER COMPLY WITH THE REGULATIONS
AUTHORIZING THE USE OF VEHICLES FOR ROAD TRAFFIC AND THE WARRANTY
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WILL BE VOID.
BRAKE FLUID:
KTM fills the brake systems with Motorex Brake Fluid DOT 5.1 brake fluid,
one of the best brake fluids that is currently available. We recommend that
you continue to use it. DOT 5.1 brake fluid is based on glycol ether and of an
amber color. If you do not have any DOT 5.1 for refilling, you may use DOT
4 brake fluid. However, you should replace it as soon as possible
by DOT 5.1.
Never use DOT 5 braking fluid. It is based on silicone oil and has a purple
color. Gaskets and brake hoses are not compatible with it.
Brake fluid is exposed to a high thermal load and absorbs moisture from the
air, which lowers the boiling point. The brake fluid should therefore be changed
at the prescribed intervals.
HAVE THE BRAKE FLUID CHANGED AT LEAST ONCE ANNUALLY. IF YOU WASH YOUR
MOTORCYCLE OFTEN, THE BRAKE FLUID SHOULD BE CHANGED EVEN MORE FRE-
QUENTLY. BRAKE FLUID TENDS TO ABSORB WATER. THEREFORE, VAPOR POCK-
ETS MAY FORM IN „OLD" BRAKE FLUIDS EVEN AT LOW TEMPERATURES, CAUS-
ING THE BRAKE SYSTEM TO FAIL.
BRAKE FLUID RESERVOIRS:
The brake fluid reservoirs on the front and rear wheel brakes have been
designed in such a way that even if the brake pads are worn it is not neces-
sary to top up the brake fluid. If the brake fluid level drops below the mini-
mum level either the brake system has a leak or the brake pads are completely
worn. In this case, consult an authorized KTM dealer immediately.
BRAKE DISCS:
Wear reduces the thickness of the brake disc in the area of contact [1] with
the brake pads. The brake disk should not be thinner than 4.5 mm (0.18 in)
A
at the weakest point [A]. Check the wear at several points.
BRAKE DISKS THAT ARE LESS THAN 4.5 MM (0.18 IN) THICK ARE A SAFETY HAZ-
ARD. HAVE WORN BRAKE DISKS REPLACED IMMEDIATELY.
1