Yamaha MTN850-A 2017 Service Manual page 198

TIP
Do not allow any foreign materials to enter the
hydraulic unit assembly or the brake hoses
when installing the hydraulic unit assembly.
2. Remove:
• Rubber plugs or bolts (M10  1.0)
3. Install:
• Front brake hose (front brake master cylinder
to hydraulic unit) "1"
• Front brake hose (hydraulic unit to front brake
caliper) "2"
• Rear brake hose (rear brake master cylinder
to hydraulic unit) "3"
• Rear brake hose (hydraulic unit to rear brake
caliper) "4"
• Gasket
New
• Brake hose union bolts
Rear brake hose union bolt
30 N·m (3.0 kgf·m, 22 lb·ft)
ECA21121
NOTICE
If the brake hose union bolt does not turn
easily, replace the hydraulic unit assembly,
brake hoses, and related parts as a set.
TIP
When installing the brake hose (front brake mas-
ter cylinder to hydraulic unit), make sure that the
stopper "a" on the hose contacts the brake hose
(hydraulic unit to front brake caliper).
3
1
2
4. Connect:
• ABS ECU coupler "1"
TIP
• Connect the ABS ECU coupler, and then push
the lock lever "a" of the coupler in the direction
of the arrow shown.
• Make sure that the ABS ECU coupler is con-
nected in the correct position as shown in illus-
tration "A".
ABS (ANTI-LOCK BRAKE SYSTEM)
4
a
a
A
A. The ABS ECU coupler is connected correctly.
B. The ABS ECU coupler is not connected.
5. Fill:
• Brake master cylinder reservoir
• Brake fluid reservoir
(with the specified amount of the specified
brake fluid)
Specified brake fluid
DOT 4
EWA13090
WARNING
• Use only the designated brake fluid. Other
brake fluids may cause the rubber seals to
deteriorate, causing leakage and poor
brake performance.
• Refill with the same type of brake fluid that
is already in the system. Mixing brake fluids
may result in a harmful chemical reaction,
leading to poor brake performance.
• When refilling, be careful that water does
not enter the brake fluid reservoir. Water
will significantly lower the boiling point of
the brake fluid and could cause vapor lock.
ECA13540
NOTICE
Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean up
any spilt brake fluid immediately.
4-53
1
B