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Servicing Metering Valve

  1. On disc brake equipped vehicles, the metering section of combination valve must be held open before pressure bleeding.
  2. Hold metering valve open while pressure bleeding front brakes. To loosen front mounting bolt and install pressure bleeding tool on combination valve, valve stem should be fully extended or depressed.
    NOTE: Never reintroduce brake fluid that has been drained from hydraulic brake system or that has been allowed to stand in an open container for an extended period of time. Also, do not use fluid that contains a petroleum base. Petroleum based fluids will cause swelling and distortion of rubber parts in hydraulic system.
    NOTE: Bleed tubes must have a residual pressure check valves installed to keep tubes from siphoning brake fluid.
  3. Clamp master cylinder in vise at mounting flange. Install bleed tubes in outlet ports. Fill reservoirs with clean brake fluid so bleed tubes are below brake fluid level. See Fig 1.
  4. Slowly compress and release piston assemblies until bubbles no longer appear in brake fluid. Remove tubes and plug master cylinder outlets to keep fluid from draining.
Fig 1: Bench Bleeding Master Cylinder
G56272Courtesy of CHRYSLER MOTORS.
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