ION 2006-2007

Bleeding the Brake System

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The brake system bleeding procedure differs for ABS and non-ABS vehicles. The following procedure pertains only to non-ABS vehicles. For details on bleeding ABS equipped vehicles, refer to the ABS procedures later in this section.


WARNING
Make sure the master cylinder contains clean DOT 3 brake fluid at all times during the procedure.

  1. The master cylinder must be bled first if it is suspected of containing air. Bleed the master cylinder as follows:
    1. Position a container under the master cylinder to catch the brake fluid.
    2.  
    3. Loosen the left front brake line (front upper port) at the master cylinder and allow the fluid to flow from the front port.
    4.  
    5. Connect the line and tighten to 24 ft. lbs. (32 Nm).
    6.  
    7. Have an assistant depress the brake pedal slowly one time and hold it down, while you loosen the front line to expel air from the master cylinder. Tighten the line, then release the brake pedal. Repeat until all air is removed from the master cylinder.
    8.  
    9. Tighten the brake line to 24 ft. lbs. (32 Nm) when finished.
    10.  
    11. Repeat these steps for the right front brake line (rear upper port) at the master cylinder.
      WARNING
      Do not allow brake fluid to spill on or come in contact with the vehicle's finish, as it will remove the paint. In case of a spill, immediately flush the area with water.

    12.  

  2.  
  3. If a single line or fitting was the only hydraulic line disconnected, then only the caliper(s) or wheel cylinder(s) affected by that line must be bled. If the master cylinder required bleeding, then all calipers and wheel cylinders must be bled in the proper sequence:
    1. Right rear
    2.  
    3. Left front
    4.  
    5. Left rear
    6.  
    7. Right front
    8.  

  4.  
  5. Bleed the individual calipers or wheel cylinders as follows:
    1. Place a suitable wrench over the bleeder screw and attach a clear plastic hose over the screw end.
    2.  
    3. Submerge the other end in a transparent container of brake fluid.
    4.  
    5. Loosen the bleed screw, then have an assistant apply the brake pedal slowly and hold it down. Close the bleed screw, then release the brake pedal. Repeat the sequence until all air is expelled from the caliper or cylinder.
    6.  
    7. When finished, tighten the bleed screw to 97 inch lbs. (11 Nm) for the front, or 66 inch lbs. (7.5 Nm) for the rear.
    8.  

  6.  
  7. Check the pedal for a hard feeling with the engine not running. If the pedal is soft, repeat the bleeding procedure until a firm pedal is obtained.

    Click image to see an enlarged view

    Fig. Loosen the front brake line in order to bleed the master cylinder



    Click image to see an enlarged view

    Fig. Connect a bleed hose from the bleed valve on the front caliper to a jar of brake fluid



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    Fig. Always follow the lettered sequence when bleeding the hydraulic brake system

  8.  

 
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