Vehicle Fitment : 2005-2007 Ford F-250 Super Duty(Phenolic Piston Only Option Available) 2005-2007 Ford F-350 Super Duty(Phenolic Piston Only Option Available | Single Rear Wheel)Package Include:（We'll ship the Items separately in two Or More pakages if the full set is over weight. Notice please!） Rear Pair Brake Calipers Assembly Kit - 18B4921;18B4920When to Replace Brake Calipers? Over time in normal driving conditions, the heat generated from the braking system can weaken and break down seals inside the calipers.They can become rusty, contaminated or dirty, and start to leak brake fluid if you don’t drive regularly. .
