Get it checked out by a Qualified Toyota Lexus mechanic.
Get your brakes tested. I do not know what a ticking sound means.
There is no sound if they are in good working order.
It means it is time to have your brakes checked.
I get it this way... knock on heaven's door, and listen its reply.
NO it will not. If you have a knocking sound then you have trouble inside of the engine.
Yes.... the brakes will make a "metallic" sound when the brakes are getting worn.
Could be your brakes. If you have drum brakes not disk brakes that sound will happen when your shoes are worn down to the rivets. Some of the hardware such as springs, may have came off as well, which will make the loose metal sound.
The power brakes on most vehicles operate on the engine vacuum. If there is a leak or problems with the power brakes it can make a hissing sound. But then, sometimes power brakes do that when they're working properly. It could be from either a hole in the diaphragm of the brake booster or normal operation. If the sound is new, and was not there before, and your brake pedal is going to the floor, then you should have the power booster replaced.
knock knock and many more such as Kick, Kids, Knife, etc.