TT L4-1.8L Turbo (BEA) (2004)
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When using a brake system filling and bleeding appliance (such as VAS 5234) to replenish the brake fluid, make sure that filling pressure does not
exceed 1 bar.
If the filling pressure exceeds 1 bar, a hydraulically controlled change-over valve (which is required for the EDL function) prevents unrestricted
flushing of the EDL related parts of the hydraulic unit. If this is the case, it may not be possible to bleed the system properly.
For this reason the brake fluid pressure must be reduced to 1 bar on the brake filler and bleeding unit
Refer to Operating instructions for VAS 5234.
Filler and bleeder unit V.A.G 1238/B is not suitable for bleeding the brake system by using the "Basic setting" function.
If only filler and bleeder unit V A G 1238/B is available, then switch unit on/off to ensure that sufficient brake fluid is always present in reservoir
Requirement for test:
^
Connect vehicle diagnostic, testing and information system VAS 5051, select "Vehicle self-diagnosis" and vehicle system "03. Brake electronics".
Pre-bleeding of brake system
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Connect brake filler and bleeder unit VAS 5234.
^
Open bleeder screws in the specified sequence and pre-bleed brake calipers.
1. Bleed left front and right front brake calipers simultaneously.
2. Bleed left rear and right rear brake calipers simultaneously.
^
Leave the bleeder screw open, with brake fluid hose connected, until brake fluid free from air bubbles comes out of the bleeder screw.
Bleeding
Display on VAS 5051:
^
Select the diagnosis function "04. Basic settings" from the menu -1-.
Note: During the next steps the ABS warning lamp flashes.
Display on VAS 5051:
1. Enter display group
^
Using the keypad -2-, enter "001" to select Display group 001 and confirm entry with Q key.
