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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 .

  1. Remove the reservoir cap and diaphragm.
  2.  Fill the reservoir with brake fluid to the upper line of the reservoir. Place the reservoir cap to prevent dirt from entering.

Suzuki GSX-R. Front brake


  1. Attach a hose to the air bleeder valve, and insert the free end of the hose into a receptacle.
  2.  Squeeze and release the brake lever several times in rapid succession and squeeze the lever fully without releasing it.

Suzuki GSX-R. Front brake


  1. 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.
  2.  Close the air bleeder valve, pump and squeeze the lever, and open the valve.
  3.  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.

  1. Close the air bleeder valve and disconnect the hose.

Tightening torque air bleeder valve (front caliper): 7.5 Nm (0.75 Kgf-m, 5.5 Lbf-ft)

Suzuki GSX-R. Front brake


  1. Fill the reservoir with brake fluid to the upper line of the reservoir.

Suzuki GSX-R. Front brake


  1. Install the diaphragm and reservoir cap.

Rear brake

  1. Remove the right side frame cover. Refer to exterior parts removal and installation in section 9d .
  2.  Remove the rear brake fluid reservoir mounting bolt (1).

Suzuki GSX-R. Rear brake


  1. Remove the reservoir cap and diaphragm.
  2. Fill the reservoir with brake fluid to the upper line of the reservoir. Place the reservoir cap to prevent dirt from entering.

Suzuki GSX-R. Rear brake


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 nm (0.6 Kgfm, 4.5 Lbf-ft)

Suzuki GSX-R. Rear brake


Suzuki GSX-R. Rear brake


  1. Fill the reservoir with brake fluid to the upper line of the reservoir.

Suzuki GSX-R. Rear brake


  1. Install the diaphragm and reservoir cap.
  2.  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:

Helmet holders
This motorcycle has helmet holders underneath the rear seat. Hook your helmet on the helmet holder and lock the seat. Warning Riding with a helmet fastened to the helmet holder can interfere with rider control. Never carry a helmet fastened to the helmet holder. Fix the ...

Crankcase breather (pcv) hose / reed valve / cover removal and installation
Removal Lift and support the fuel tank with the prop stay. Refer to fuel tank removal and installation in section 1g .  Remove the air cleaner box. Refer to air cleaner box removal and installation in section 1d .  Disconnect the crankcase breather (pcv) hose (1). ...

Exterior parts removal and installation
Side frame cover Removal Note the left and right side frame covers are installed symmetrically and therefore the removal/installation procedure for one side is the same as that for the other side. Remove the bolt (1).  Remove the side frame cover (2). ...

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