Glossary “wheel cylinder piston” Definition:
Component in a wheel cylinder on to which hydraulic pressure is applied, that transfer force, causing the brake shoe to contact the drum.

Glossary “wheel hub” Definition:
Compoent that serves as a mounting plate for the wheel or brake rotor or drum. The wheel hub fits over the bearings on a wheel spindle or axle.

Glossary “wheel nut” Definition:
Threaded nuts used to retain the wheel to the studs on the hub assembly.

Glossary “wheel cylinder” Definition:
Hydraulic cylinder mounted on the backing plate of a drum brake assembly. The wheel cylinder convert hydraulic pressure from the master cylinder to mechanical force that applies the brake shoes against the brake drums.

Glossary “wheel centerline” Definition:
An imaginary line through the center of the tire, a vertical line if the tire is exactly in an upright position.

Glossary “wheel chocks” Definition:
Blocks to prevent the wheels of a vehicle from rolling during a repair or service procedure.

Glossary “wheel clamps” Definition:
Used to load and hold the suspension with the wheels and tires removed from the vehicle on the rack or bench.

Glossary “wheel alignment” Definition:
Condition where the wheels and tires are in proper alignment on the vehicle.

Glossary “wheel balance” Definition:
Equal distribution of weight of a wheel with a mounted tire.

Glossary “wheel base” Definition:
The distance from the center of the front wheels to the center of the rear wheels.

Glossary “wheel bearing” Definition:
Term for non-driving front or rear wheel bearing.

Glossary “wheel adapter” Definition:
Metal plate that permits the use of a wheel having a different bolt pattern.