BLEEDING BRAKE SYSTEM BLEEDING SEQUENCE BLEEDING SEQUENCE MASTER CYLINDER BLEEDING 1. Place master cylinder in soft-jawed vise. DO NOT overtighten vise. Install bleeder tubes in both outlets of master cylinder. See Fig. 1 . Fill master cylinder reservoir. Ensure ends of bleeder tubes are submerged in brake fluid. 2. Press and release piston assembly until air bubbles are no longer present in fluid flow. Leave bleeder tubes installed on master cylinder. Install master cylinder. 3. Remove bleeder tubes. Connect brake lines at master cylinder. DO NOT fully tighten brake lines at this time. Slowly press brake pedal to floor and hold. Tighten brake lines. Release brake pedal. Bleed brake system. See MANUAL BLEEDING , PRESSURE BLEEDING or VACUUM BLEEDING . Fig. 1: Bench Bleeding Master Cylinder Courtesy of GENERAL MOTORS CORP. MANUAL BLEEDING 1. Fill master cylinder. Install bleeder hose to bleeder screw at first wheel to be serviced. See BLEEDING SEQUENCE under BLEEDING BRAKE SYSTEM . Submerge other end of hose in glass jar partially filled with brake fluid. 2. Open bleeder screw 3/4 - 1 turn. Slowly press brake pedal to floor. Note fluid flow. Close bleeder screw. Release pedal. Repeat procedure until air bubbles are no longer present in fluid flow. NOTE: On vehicles with ABS, wait 15 seconds between pedal strokes when bleeding brake system. On vehicles with Hydro-Boost, check for air bubbles in power steering fluid reservoir. If air bubbles are present, bleed Hydro-Boost system before bleeding brake system. See BLEEDING HYDRO-BOOST SYSTEM in POWER BRAKE BOOSTER - BENDIX HYDRO-BOOST article in this section. Application Sequence "C & K" Series RR, LR, RF, LF NOTE: To prevent air from entering brake system, bench bleed master cylinder before installing. NOTE: Air tends to cling to caliper walls. When bleeding vehicles with disc brakes, lightly tap caliper to help remove air.
1. Retain hold-off valve stem of combination valve using Valve Retainer (J-23709). See Fig. 2 . This allows brake fluid to flow through combination valve and entire system during bleeding.