What must be done before forcing a caliper piston back into its bore on a wheel cylinder during servicing? A. Open the bleed nut and drain the displaced fluid. B. Open the master cylinder lid to allow...

What must be done before forcing a caliper piston back into its bore on a wheel cylinder during servicing?

A. Open the bleed nut and drain the displaced fluid.

B. Open the master cylinder lid to allow the fluid to return to the reservoir.

C. Drain the master cylinder to prevent spillage.

D. Remove the brake line to drain the caliper.