Suzuki GSX-R 1000 Service Manual: Air bleeding from 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 cylinder 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:
| Caution handle brake fluid with care: the fluid reacts chemically with paint, plastic, rubber materials, etc. |
Front brake
| Note if air is trapped in the master cylinder, bleed air from the master cylinder first in the same manner as follows. Refer to “front brake master cylinder assembly removal and installation” . |
- Remove the reservoir cap and diaphragm.
- Fill the reservoir with brake fluid to the upper line of the reservoir. Place 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 squeeze the lever fully without releasing it.
- Loosen the air bleeder valve by turning it 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.
- Close the air bleeder valve, pump and squeeze the lever, and open the valve.
- Repeat this process until the fluid flowing into the receptacle no longer contains 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.
Tightening torque air bleeder valve (front caliper): 7.5 N·m (0.75 Kgf-m, 5.5 Lbf-ft)
- Fill the reservoir with brake fluid to the upper line of the reservoir.
- Install the diaphragm and reservoir cap.
Rear brake
- Remove the right side frame cover. Refer to “exterior parts removal and installation” in section 9d .
- Remove the rear brake fluid reservoir mounting bolt (1).
- Remove the reservoir cap and diaphragm.
- Fill the reservoir with brake fluid to the upper line of the reservoir. Place the reservoir cap to prevent dirt from entering.
| Note the difference of bleeding operation from the front brake is that the rear master cylinder is actuated by a pedal. |
Tightening torque air bleeder valve (rear caliper): 6 n·m (0.6 Kgfm, 4.5 Lbf-ft)
- Fill the reservoir with brake fluid to the upper line of the reservoir.
- Install the diaphragm and reservoir cap.
- Install the removed parts.
Rear brake light switch inspection and adjustment
Check the rear brake light switch so that the brake light
will come on just before pressure is felt when the brake
pedal is depressed. If the brake light switch adjustment
is necessary, turn the ad ...
Brake fluid replacement
Caution
handle brake fluid with care: the fluid reacts
chemically with paint, plastic, rubber
materials, etc.
Front brake
Place the motorcycle on a level surface and keep the ...
Other materials:
Cushion lever removal and installation
Removal
Remove the right side cowling and side frame covers. Refer to “exterior
parts removal and installation” in section 9d .
Support the motorcycle with a jack to relieve load on
the cushion levers.
Remove the left muffler and muffler chamber heat guard no. 2. Refer to
...
Short circuit check (wire harness to ground)
Disconnect the negative (–) cable from the battery.
Disconnect the connectors/couplers at both ends of
the circuit to be checked.
Note
if the circuit to be checked branches to other
parts as shown, disconnect all connectors/
couplers of those parts. Otherwise, diagnos ...
Front wheel dust seal / bearing removal and installation
Removal
Remove the front wheel assembly. Refer to “front wheel assembly removal
and installation” .
Remove the dust seals using the special tool.
Special tool
(a): 09913–50121 (oil
seal remover)
Remove the wheel bearings using the special tool.
Special tool
(b): 099 ...