Bleeding brake system if brake fluid reservoir has run dry — AUDI

🧭 Before you start

Fits: Audi TT Mk1 (8N)

• Opens: brake fluid
• Special tools named: VAS 5234, V.A.G 1869

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• The brake system must now be bled Brake system47.

📋 Procedure

1. ⚠ When using brake charge and bleed equipmentVAS 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 for the EDL function prevents unrestricted flushing of the EDL-related parts of the hydraulic unit. Proper bleeding is then no longer ensured.For this reason the brake fluid pressure must be reduced to 1 bar on the brake charge and bleed equipment Operating Manual VAS 5234 or V.A.G 1869 AThe charge and bleeder unitV.A.G 1238/B is not suitable for bleeding the brake system by using the function "“04 - Basic setting”". — Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“03 - Brake electronics”". When doing this the ignition must be switched on.
2. Connect the brake charge and bleed equipmentVAS 5234 or V.A.G 1869 A.
3. Open bleed screws in prescribed sequence and pre-bleed brake calipers.
4. With bleeder bottle hoses attached, leave bleed screws open until the brake fluid emerges free from bubbles.
5. From list (1), select function "“04 - Basic setting”".

6. Use keypad (2) to enter "“001”" for "“Display group number 001”" and confirm by pressing the Q key.
7. Press pedal with substantial foot pressure and hold.
8. Release pedal, open front bleed screws.
9. Press ↑ key to switch to display group 002.
10. Wait 10 seconds.
11. Press pedal 10 times, close front bleed screws.
12. Press ↑ key to switch to display group 003.
13. Repeat bleeding procedure as described above.
14. Press the ↑ key in each case to switch to next highest display group until display group 017 is reached.
15. Terminate function "“04 - Basic setting”" by pressing the ← key.
16. The brake system must now be bled Brake system47.

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