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Home >> Lincoln >> 1995 >> Mark VIII Base >> Repair and Diagnosis >> Steering >> Power Steering >> Steering System >> Lubrication >> Hydraulic System Bleeding

Hydraulic System Bleeding

  1. Fill pump reservoir. Operate engine until power steering fluid reaches operating temperature. Stop engine. Recheck fluid level. Add fluid as necessary. Repeat procedure until fluid level stabilizes.
  2. Raise and support vehicle so front wheels are off ground. Start engine. Turn steering wheel from side to side several times. Avoid holding wheel in full left or right position. Fluid level should remain visible.
  3. Return wheels to center position. Operate engine for 2-3 minutes. Road test vehicle. Recheck fluid level. Fluid containing air has milky appearance. All air should be eliminated to obtain normal steering.
    NOTE: Abnormal noise originating from the power steering system may be caused by air trapped in system. Use Rotunda Vacuum Tester (021-00014), and follow procedure in steps 4)-7) to eliminate this condition.
  4. Carefully remove pump filler adapter and dipstick. Check and fill reservoir to FULL COLD mark. Disconnect and ground ignition coil lead. Raise and support front of vehicle.
  5. Crank engine while turning steering wheel from side to side. DO NOT  hold wheel on stops. Add fluid if necessary. Attach coil lead. Install vacuum tester onto reservoir.
    NOTE: DO NOT  use engine as vacuum source to purge air from power steering system.
  6. Start engine. Apply 20-25 in. Hg vacuum to reservoir for approximately 3 minutes with engine idling. As air is purged from system, vacuum will tend to decrease. Maintain specified vacuum with vacuum source.
  7. Release vacuum. Check fluid level. Start engine. Turn steering wheel from side to side while checking for leaks. If condition is severe, repeat procedure until all air is removed.
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