A Close-up View Of Disc Brakes
When brakes are applied, increased hydraulic pressure travels through the Brake Lines and Hoses (5) into the cylinder of the Caliper Assembly (6). This forces a piston against the metal backing of the Disc Pad (8), which then closes against the rotating disc. This vise-like action slows and then stops the rotation.

Brake Pads: Worn pads can groove rotors, causing brake noise and damage. Excessively worn pads should be replaced.

Calipers: Calipers hold pads in place against the revolving rotor to stop the vehicle. Leaking calipers can damage pads and weaken the system, causing unreliable stopping. Damaged calipers should be serviced or replaced.

Rotor (or Disc): The disc pads make frictional contact with the rotor to stop the vehicle. Warped or grooved rotors wear out pads fast, cause brake noise and dangerous brake lock-up, and should be resurfaced or replaced.

Grease Seal: This seal protects wheel bearings from foreign materials and prevents lubricant leakage. Damaged seals will cause excessive wheel bearing wear and should be replaced.

Caliper Seal: This seal returns pistons to neutral position, prevents brake fluid leakage, and helps maintain piston adjustment. Damaged seals hamper piston operation. Pads remain against rotor, causing excessive pad wear, heat damage to rotor and pads, and low gas mileage from brake drag. Damaged seals require caliper service.

Caliper Piston: This piston pushes against the pads. A damaged piston may freeze, causing brake drag, excessive pedal effort, pad wear, or leakage. It should be replaced and the caliper should be serviced.

Dust Boot: The Dust Boot protects the caliper seal, caliper piston slide surface, and internal caliper parts. If damaged, excessive caliper-seal wear results, causing fluid leakage and damaging delicate internal parts. Damaged dust boots require caliper service.

Caliper Hardware: These keep the caliper in place and retract the caliper. Damaged hardware cause excessive pad wear, dragging and brake noise, and should be replaced.

F & F Tire & Service Co.

Wisconsin Locations	20120 W Bluemound   Brookfield, WI (262) 786-9170	410 N Moorland Rd. Brookfield, WI (262) 785-1730	7425 W. Holmes Ave Greenfield, WI (414) 421-1155
	10730 National Ave. West Allis, WI (414) 321-5009	564 E. Grand Ave. Beloit, WI (608) 365-9393	3108 N. Pontiac Dr. Janesville, WI (608) 756-3594
	3030 W. Loomis Rd. Milwaukee, WI (414) 325-1583	2201 E. Geneva St. Delavan, WI 262-728-1155	2930 W Rawson Ave Franklin WI 53132 414-761-0000
Illinois Locations	3636 N. Harlem Ave. Chicago, Illinois (773) 589-0990	1938 Pawlisch Dr Rockford IL 61125 815 332-9445	5302 N 2nd St Loves Park IL 61111 815 282-1177
	520 Logan Ave. Belvidere IL 61008 815 544-4452	5257 Swanson Road Roscoe IL 61073 815 637-4055	1610 S Alpine Road Rockford IL 61108 815 398-7867
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