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Stemco (from "Specialized Truck Equipment Manufacturing Company") is a Longview, Texas, based company that manufactures and distributes products for the global commercial vehicle market. Its major product categories include wheel end products, brake products, intelligent transportation systems and suspension components.
Truck air-actuated disc brake. An air brake or, more formally, a compressed-air-brake system, is a type of friction brake for vehicles in which compressed air pressing on a piston is used to both release the parking/emergency brakes in order to move the vehicle, and also to apply pressure to the brake pads or brake shoes to slow and stop the vehicle.
The embedded sensor in the brake pad 2 contacts the rotor and creates a connection to ground of the sensor. The metal plate 3 contacts the rotor and creates a noise. This wear clip should be positioned so that the rotor contacts the clip before it contacts the brake pad. The rotor should push against that clip, not drag it away from the brake pad.
An S-cam is part of a braking system used in heavy vehicles such as trucks and wheeled machinery. It consists of a shaft, usually around 4 to 25 inches long, turned at one end by means of an air-powered brake booster and lever with an S-shaped cam at the wheel end. Turning the shaft pushes the brake shoes against the drum, producing friction.
Meanwhile, heavy trucks still use drum brakes because they take up the same space. Railways have never used internal expanding drum brakes because they cause skidding, causing expensive flat spots on steel wheels. Both disc and drum brakes can be improved by any technique that removes heat from the braking surfaces.
A drum brake is a vehicle brake in which the friction is caused by a set of brake shoes that press against the inner surface of a rotating drum. The drum is connected to the rotating roadwheel hub. Drum brakes generally can be found on older car and truck models.
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Drum brakes are used in most heavy duty trucks, buses, some medium and light duty trucks, and a few cars, dirt bikes, ATVs, and a few smaller recreational vehicles like electric scooters. Drum brakes are often applied to the rear wheels since most of the stopping force is generated by the front brakes of the vehicle, and therefore, the heat ...
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