konkapot

55k miles. When sitting at a stop I hear a very faint growling noise from the back of the car, roughly underneath the backseat.

When I step on the brakes the noise subsides/almost totally disappears.

Brakes feel fine, although now that I am hyper-sensitive to the, maybe a tiny bit soft.

Will be at the dealership on Monday, but just looking for any input from the knowledgable folks here.

Thanks

John