How to reset the rear brake caliper piston on the Volkswagen Lavida?

[CharlieLee]

To reset the rear brake caliper piston on the Volkswagen Lavida, you need to disassemble the caliper and lightly sand the rusted areas with fine sandpaper. Reasons for the piston not resetting: If the brake caliper piston cannot be pushed back in, it is likely due to rust inside the caliper. Rust on cast iron is a common occurrence, but another cause of rust is not changing the brake fluid for a long time, which leads to fluid degradation. The moisture in the fluid will accelerate the oxidation of the caliper (cast iron). Precautions during disassembly: During the piston disassembly process, brake fluid will leak out. To avoid wasting the leaking brake fluid, you should remove the oil pipe and secure it with tape.