Removing The Hydraulic Unit Assembly; Checking The Hydraulic Unit Assembly - Yamaha MT-09 2021 Service Manual

EAS30197
REMOVING THE HYDRAULIC UNIT
ASSEMBLY
ECA21091
NOTICE
Unless necessary, avoid removing and in-
stalling the brake hoses of the hydraulic unit
assembly.
EWA13930
WARNING
Refill with the same type of brake fluid that is
already in the system. Mixing fluids may re-
sult in a harmful chemical reaction, leading
to poor braking performance.
ECA18241
NOTICE
• Handle the ABS components with care
since they have been accurately adjusted.
Keep them away from dirt and do not sub-
ject them to shocks.
• Do not turn the main switch to "ON" when

removing the hydraulic unit assembly.

• Do not clean with compressed air.
• Do not reuse the brake fluid.
• Brake fluid may damage painted surfaces
and plastic parts. Therefore, always clean
up any spilt brake fluid immediately.
• Do not allow any brake fluid to contact the
couplers. Brake fluid may damage the cou-
plers and cause bad contacts.
• If the union bolts for the hydraulic unit as-
sembly have been removed, be sure to
tighten them to the specified torque and
bleed the brake system.
1. Disconnect:
• ABS ECU coupler "1"
TIP
While pushing the portion "a" of the ABS ECU
coupler, pull the lock lever "2" up to release the
lock.
2
2. Remove:
• Brake hose
ABS (ANTI-LOCK BRAKE SYSTEM)
a
1
TIP
• Do not operate the brake lever and brake pedal
while removing the brake hoses.
• Do not bend the brake pipe when loosening the
brake pipe flare nuts.
ECA19800
NOTICE
• When removing the brake hoses and brake
pipes, cover the area around the hydraulic
unit assembly to catch any spilt brake fluid.
Do not allow the brake fluid to contact other
parts.
• Before disconnecting the brake pipes from
the hydraulic unit assembly, do not lift up
or move the brake pipes.
3. Remove:
• Hydraulic unit assembly "1"
TIP
To avoid brake fluid leakage and to prevent for-
eign materials from entering the hydraulic unit
assembly, insert a rubber plug "a" or a bolt (M10
× 1.0) into each brake hose union bolt hole.
ECA19810
NOTICE
When using a bolt, do not tighten the bolt un-
til the bolt head touches the hydraulic unit.
Otherwise, the brake pipe seating surface
could be deformed.
a
1
EAS30198
CHECKING THE HYDRAULIC UNIT
ASSEMBLY
1. Check:
• Hydraulic unit assembly
Cracks/damage → Replace the hydraulic unit
assembly and the brake pipes that are con-
nected to the assembly as a set.
4-51