How to Bleed the Brakes on Isuzu Vehicles

Air in the brake hydraulic circuit can dangerously reduce braking effectiveness. If the brake fluid level in the reservoir has been too low or if a brake line has been disconnected during maintenance, the brake hydraulic circuit must be bled. This procedure requires two people.

Brake Bleeding Procedure

Bleeding Order

• LHD Vehicles:
  1. Left rear wheel (vehicles with ABS)
  2. Right rear wheel
  3. DSPV or LSPV (if equipped)
  4. Right front wheel
  5. Left front wheel
• RHD Vehicles:
  1. Left rear wheel (vehicles with ABS)
  2. Right rear wheel
  3. DSPV or LSPV (if equipped)
  4. Left front wheel
  5. Right front wheel
     

Steps to Bleed the Brakes

1. Preparation:
   • Ensure the maintenance area is well-ventilated.
   • Firmly apply the parking brake.
   • Start the engine and run it until sufficient vacuum is built up.

   Note: Bleeding with the engine running affects the brake booster performance.

2. ABS Vehicles:
   • Remove the ABS fuse (60 A) from the fuse box before bleeding. This prevents air from remaining in the ABS unit, which could damage it.
   • After bleeding, reinstall the ABS fuse.
     
3. Fill Brake Fluid:
   • Fill the brake fluid reservoir with clean brake fluid up to the “MAX” level.
   • Refill the reservoir as needed during the bleeding process to maintain the required fluid level.
4. Bleed the Right Rear Wheel:
   • Remove the rubber cap from the bleed screw and clean it.
   • Connect one end of a vinyl hose to the bleed screw.
   • Place the other end of the hose into a clear container filled one-third with brake fluid.
   • Slowly depress the brake pedal three times and hold it down.
   • Loosen the bleeder screw about half a turn to allow air bubbles to escape into the container.
   • Retighten the bleeder screw once no air bubbles are visible.
   • Slowly release the brake pedal.
   • Replace the rubber cap on the bleed screw.
5. Repeat Steps:
   • Repeat steps 3 to 10 for each wheel following the specified order.
   • For front wheels, perform the bleeding at least 10 times.
   • For rear wheels, perform the bleeding at least 15 times.
6. Check Fluid Levels:
   • After each wheel is bled, check the fluid level in the reservoir tank and add fluid if necessary (do not exceed the “MAX” level).
7. Finish:
   • Stop the engine and ensure the braking system operates normally by depressing the brake pedal.

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