Hydraulic System, Pre-Bleeding

Special tools and workshop equipment required 

• Brake Charger/Bleeder Unit: VAS5234 
• Brake Bleeding Tool Set: VAS6564 
• Brake Charge and Bleed Equipment - Upgrade Kit: VAG1869/4 
• Brake Bleeding Tool Set - Insert Tool : VAS6564/9 

The Bleeding of Brake System Using the : VAS5234  is Described.

There Must Be a Positive Pressure of 2 Bar (29 psi) to Bleed the Hydraulic Unit.

Pre-bleeding 

Adhere strictly to the procedure when bleeding the brake system

The bleeding of brake system using the : VAS5234  is described.

There must be a positive pressure of 2 bar (29 psi) to bleed the hydraulic unit

See notes. Refer to BRAKE FLUID GENERAL INFORMATION .

-- Fill the brake fluid reservoir up to the max mark.

-- Connect the : VAS5234  with the : VAS5234/1A  .

-- Attach the adapter -1- to the brake fluid reservoir.

-- Set the correct pressure on the : VAS5234  .

-- Refer to the operating instructions for the : VAS5234  .

-- Remove the left and right front caps -1-.

-- Remove the left and right rear caps -1-.

Use a suitable bleeder hose

It must fit tightly on the bleeder valve so that no air can get into the brake system

Bleeding sequence: 

1. Bleed Left Front and Right Front Brake Calipers Simultaneously.
   Fig 4: Identifying Bleed Valve

   Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
2. Bleed Left Rear and Right Rear Brake Calipers/Brake Cylinders Simultaneously.
   Fig 5: Identifying V.A.G 1869/2

   Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- With bleeder bottle hoses attached, leave the bleeder valves open long enough so that the brake fluid flows out without any bubbles.

-- Afterward, bleed the brake system normally. Refer to HYDRAULIC SYSTEM, STANDARD BLEEDING .