When I depress the brake pedal on a 2000 Toyota Sienna, every time the pedal reaches near the halfway mark, there is a discernible click. As the vehicle approaches a stop and I feather the brakes, there is a soft squeal. What explains these phenomena?
The "click" is probably the brake pedal switch turning on when the brake pedal is depressed.
The "squeal" is will be due to the brake pads coming in contact with the brake discs. Some brake pads are designed to squeal to indicate that they are nearing the end of their useful life. Sometimes the squeal is caused by contamination of the brake pads with fine dirt or debris.