This procedure outlines the bleeding of brake system using the brake filler and bleeder unit VAS 5234, or equivalent equipment.
If one chamber of the brake fluid reservoir has run completely empty (e.g. leak in the brake system), the hydraulic unit must be bled using the "Basic Setting" function and the fault readout device V.A.G1551.
If the master brake cylinder was removed or replaced, you must bleed the brake system first. Refer to the procedure for bleeding the system without the brake fluid filler and bleeding unit.
- Connect brake filler and bleeder unit VAS 5234.
Insert brake pedal depressor V.A.G1869/2.
Open bleeder screws in the prescribed sequence and bleed brake caliper. The proper sequence is:
- Right rear brake caliper
- Left rear brake caliper
- Right front brake caliper
Left front brake caliper
NOTEUse appropriate bleeder hose. It must fit tightly on the bleeder screw so that no air gets into the brake system.
- With bleeder bottle hose attached, leave vent screws on one brake caliper open long enough that brake fluid exits without bubbles.
Vehicles with ABS or ABS/EDL must be road tested following bleeding procedure. At least one ABS-controlled braking must be performed!
NOTEFor vehicles with brake booster, move booster lever when bleeding rear brakes.