Comparison of Wound Certification Programs*. Updated 6/8/2006. *References: www.wocncb.org; www.aawm.org; www.wcei.net; http://www.nawccb.org/certification.html. Provider. Wound, Ostomy and Continence Nursing. Certification Board. Wound Care Education Institute American Academy of Wound Management.
The metal rotor that the brake pads squeeze together can sometimes vibrate, causing a squeaking noise. Luckily, there are several ways to fix this: 1  Use a milk spray, lotion or cream on the back of the pads [source: Allen].  Use sandpaper to sand off surface hardening of the brake pad/shoe surface.
When you step on the brake pedal, the master cylinder sends fluid under pressure to the brake calipers (which hold the brake pads). The caliper presses the brake pad against the brake rotor, causing friction that slows down the car. During normal usage of the brakes, brake pads wear out and become thinner. If the thickness of brake pads is less than 3mm, it is time to change the pads.