The rear disc brakes are a sliding caliper type disc brake system. The brake systems used by Audi and Volkswagen are subjected to rigorous testing and must meet stringent DIN industry standards. The components of the brake system are designed to be compatible with one another. Aside from steel braided hydraulic brake lines, different brake pad compounds, there is very little that can be done to improve the performance and reliability of the original equipment brakes short of upgrading the entire brake system.
When replacing or repairing the brake components, for reasons of safety and liability, use original equipment components that meet the manufacturer's standards. If the vehicle is used for sporting events or closed course competition:
The rear disc brakes utilize a sliding caliper similar to the front disc brakes. The parking brake assembly is incorporated into the rear brake caliper. Most of the maintenance procedures are the same as the front disc brakes, except when retracting the rear brake caliper piston, which must be rotated while being pressed inward.