Brake Fluid: Service and Repair

Brake fluid, changing (every 2 years)

WARNING:
^ NEVER bring brake fluid into contact with fluids containing mineral oil (oil, gasoline, cleaning fluids). Mineral oils damage plugs and boots in the brake system.
^ Brake fluid is poisonous. NEVER siphon brake fluid with your mouth! Due to its caustic nature, it must also never be brought into contact with paint.
^ Brake fluid is hydroscopic, meaning that absorbs moisture from the surrounding air, and must therefore be stored in airtight containers.
^ Observe disposal regulations.

Note:
^ Use only new brake fluid conforming to US standard FMVSS 116 DOT 4.
^ Genuine VW/Audi brake fluid conforms to this specification.
^ Rinse off any spilled brake fluid using plenty of water.
^ Do not work with compressed air and do not move vehicle while the system is open.
^ During final road test, carry out at least one ABS-controlled braking operation (appropriate pulsations must be felt at brake pedal).

Changing brake fluid using US1116 brake bleeder
- Open brake fluid reservoir.

Note: Brake fluid reservoir must be kept adequately filled at all times to prevent air from entering the brake system through the reservoir.





- With engine running and bleeder screw on right-rear brake caliper open, use brake pedal to pump brake fluid out of reservoir until level goes down as far as opening for hydraulic clutch supply hose.
- Collect used brake fluid in suitable container. Close bleeder screw.
- Connect US1116 brake bleeder.
- Open bleeder screw of clutch slave cylinder and allow about 100 cc of brake fluid to drain out.
- Close bleeder screw.

The sequence is valid for all four brake calipers.
1. Rear right brake caliper
2. Rear left brake caliper
3. Front right brake caliper
4. Front left brake caliper
- Attach bleeder hose from brake fluid collector to bleeder screw.
- Open bleeder screw and allow about 250 cc of brake fluid to drain out.
The action of pumping in new brake fluid flushes used brake fluid out of the system.
- Close bleeder screw.
- Disconnect connection at brake fluid reservoir.
- Check pedal pressure and brake pedal free play. Max. free play: 1/3 of pedal travel