Q1. During a brake bleeding procedure on a vehicle with a tandem master cylinder, the pedal remains soft after multiple bleeding cycles. The fluid reservoir is full, and no external leaks are visible. What is the best diagnostic approach to isolate the problem?

• ○Check for internal master cylinder seal failure causing fluid bypass and soft pedal.
• ○Repeat bleeding using a pressure bleeder to ensure all air is removed.
• ○Inspect caliper pistons for seizure preventing proper fluid pressure.
• ○Replace brake fluid with DOT 4 to improve hydraulic performance.