When talking about the location of brakes on a rollator we should be explaining that there is the hand brakes portion that starts the engaging of the brake pads that will slop the forward motion or lock in the wheels if you have a rollator.
Hand brake location: On a rollator, the hand brakes are located right below the grips. This is done so that when you squeeze the brake it is in a location that is easy to squeeze and it can be deployed faster because your hands are already located on the grip anyways.
Brake pads: The brake pads are what clamp down on the back wheels to actually start to slow and then stop the forward motion when you grip and push up the brake handle. These are located on the back wheels and are connected via a small cable from the handle to the pads.