This is a replacement part for disc brake calipers.
Due to its structural nature, the caliper is susceptible to heat and moisture, and the rubber seal will deteriorate year after year.
Decreasing seal performance may cause the piston to stick and lead to abnormal wear and leakage of the pad.
When the slide pin boot degrades with the caliper attachment, rust will stick to the pin and cause "one handed brakes" or "pad slacker".
It is important to check your vehicle or change the pad.