2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 363Get this manual
4A-7 Brake Control System and Diagnosis: 2) Attach hose to the air bleeder valve, and insert the free end of the hose into receptacle3) Squeeze and release the brake lever several times in rapid succession and squeeze the lever fully without releasing it8) Fill the reservoir with brake fluid to the upper mark of the reservoir I933H1410008-01
9) Install the master cylinder reservoir capI933H1410006-01
4) Loosen the air bleeder valve (1) by turning it quarter of 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
Rear brake Bleed air from the rear brake system as the same manner of front brakeNOTE The only difference of bleeding operation from the front brake is that the rear master cylinder is actuated by pedal Remove the fuel tank coverRefer to "Exterior Parts Removal and Installation in Section 9D (Page 9D-4)"