TGB Blade 250 ATV Quad Service Repair Manual, Page 187Get this manual
16REAR BRAKEREAR WHEELREAR CUSHION Brake fluid replacement Air-bleed
Connect drain hose to air-bleed valveOpen the drain valve on the caliper and operate the brake lever until the old brake fluid is entirely drained outClose the drain valve and add specified brake fluid into the brake master cylinderRecommended brake fluid: WELLRUN DOT brake fluid