Brake Bleeding: Service Precautions

Brake system, bleeding

Vehicles with ABS and ABS/EDL
When at least one chamber in the brake fluid reservoir is completely empty (e.g. leaks in braking system) the hydraulic unit must be bled using the VAG 1551 scan tool in function 04, "basic setting".

Basic setting
Refer to Brake System On Board Diagnostic (OBD) in Antilock Brakes / Traction Control Systems; Testing and Inspection. Testing and Inspection

WARNING! Do not exceed a filling pressure of 1 bar (14.5 psi) when filling with brake fluid using brake filler and bleeder unit VAS 5234. The brake system will not be completely bled if excessive pressure is used.

Note:
- Bleeding the brake system on vehicles with ABS is the same as for vehicles with conventional braking systems with the exception of using function 04 to bleed systems that have been completely empty.
- Brake fluid absorbs moisture from the air and must therefore be replaced every two years. Use only new, unused and approved brake fluid that complies with MVSS 116 DOT 4.

Note:
- Brake Fluid is poisonous. Also due to its corrosive effect brake Fluid must not come into contact with paintwork.
- Brake Fluid must always be stored in air tight containers.
- Do not use silicone-based brake Fluid (DOT 5). Even the smallest trace can cause severe corrosion in the brake system.
- Rinse off brake fluid spillages using plenty of water.