Suzuki LT-Z250 Service Manual page 32

2-16 PERIODIC MAINTENANCE
AIR BLEEDING THE BRAKE FLUID CIRCUIT
Air trapped in the brake fluid circuit acts like a cushion to absorb
a large proportion of the pressure developed by the master cyl-
inder and thus interferes with the full braking performance of the
brake caliper. The presence of air is indicated by sponginess
of the brake lever and also by lack of braking force. Considering
the danger to which such trapped air exposes the machine and
rider, it is essential that after remounting the brake and restoring
the brake system to the normal condition, the brake fluid circuit
be purged of air in the following manner:
Fill the front brake reservoir with the specified brake fluid to
the top of the inspection window or the upper limit line.
Replace the reservoir cap to prevent dirt from entering.
Attach a hose to the air bleeder valve, and insert the free end
of the hose into a receptacle.
Squeeze and release the brake lever several times in rapid
succession and hold the lever fully squeezed. Loosen the air
bleeder valve for about a quarter of a turn so that the brake
fluid runs into the receptacle, this will remove the tension of
the brake lever causing it to touch the handlebar grip. Then,
close the air bleeder valve, pump and squeeze the lever and
open the valve. Repeat this process until the fluid flowing into
the receptacle contains no air bubbles.
NOTE:
While bleeding the brake system, replenish the brake fluid in the
reservoir as necessary. Make sure that there is always some
fluid visible in the reservoir.
Close the air bleeder valve and disconnect the hose. Fill the
reservoir with brake fluid to the top of the inspection window
or the upper limit line.
# Air bleeder valve: 6 N•m (0.6 kgf-m, 4.4 lb-ft)
"
Handle brake fluid with care: the fluid reacts chemi-
cally with paint, plastics, rubber materials, etc.