Rollerbrakes very noisy when used
Roller Brakes (a form of drum brake) do need a regular service, which does require grease (yes it does seem weird to grease brakes) as there are some moving parts that can rub. You should be able to buy some Roller Brake grease/oil and apply to the appropriate location. I am not 100% familiar with Roller Brakes, so you may need to check the location in your manual, or perhaps someone else can help out with the description of rubber cover if needed.