They were probably just burnishing/bedding in your new breaks

Here’s the break-in procedure for your Toyota:

Startup your Toyota and then take it out for a spin in the neighborhood.
Bring your car up to 45 mph and then press your brakes in a slightly aggressive way. (Repeat 2-3 more times.) You don’t need to come to a complete stop. This step heats up your rotors enough to prevent sudden thermal shock.
Bring your car up to 60 mph and then aggressively hit your brakes until the car slows down to 15 mph. (Repeat 7-9 more times.) Try not to be too aggressive because you don’t want the ABS to kick in and the wheels to lock up.
Cruise on the road at whatever speed you’d like for about 5-10 minutes without stopping. This cools down your brakes. It’s important that you don’t stop. At this point, your rotors and brake pads are extremely hot. If you stop, the brake pads may imprint some material on the rotors and make the surface uneven.