Bleeding Brake System
CAUTION:
The anti-lock brake system must be bled using the following procedure. If this procedure is not followed, air may be trapped in the Hydraulic Control Unit (HCU), resulting in a spongy pedal.
NOTE:
DO NOT allow master cylinder to run dry during bleeding procedure.
- Turn ignition off. Connect a clear bleeder hose to left front bleed screw. Open left front bleed screw. Cycle brake pedal 25-30 times or until no air is seen in bleeder hose. Close left front bleed screw. Repeat procedure for remaining wheels. Bleed front wheels before bleeding rear wheels. See BLEEDING SEQUENCE
table.BLEEDING SEQUENCE
Application Sequence Front LF, RF Rear LR, RR NOTE: Performing New Generation Star (NGS) program routine drives trapped air from the inaccessible lower sections of ABS valve into upper sections (accessible by bleeding at brakes). Bleeding procedure in following steps removes air from system. - Attach New Generation Star (NGS) tester (007-00500) according to equipment manufacturers instructions. Follow menus and prompts. Select DDS FUNCTIONS menu. Choose 4-WABS menu. From 4-WABS menu, choose BLEED PROCEDURE and follow prompts.
- One conventional pressure bleed cycle consists of depressing brake pedal to its extended position, opening bleed screw, allowing fluid to flow, closing bleed screw, and releasing brake pedal. Perform a minimum of 7 conventional pressure bleed cycles for left and right front brakes.
- Perform steps 2-3) 2 times. On last bleed cycle, bleed rear brakes to ensure all air is removed from system. Refer to the BLEEDING SEQUENCE table.