The parking brake pads are the same brake pads that stop your
vehicle when you apply the brake petal. This is a mechanical system
instead of a hydraulic one and so, yes, the parking break is needed
in the event that the hydraulic system fails or in case you should
have to change the tire. The last thing you want is to park on a
hill and come out and find your vehicle at the bottom. Get it fixed
at a reputable brake repair shop.