A Volvo VNL uses a long-stroke piggyback spring brake chamber on the drive axle and a smaller service chamber on the steer axle, and the two are never interchangeable. On a VNL with rear drum brakes, the drive-axle unit is normally a type 30/30 spring brake with a 3 in. (76 mm) nominal stroke; the... read more
A slack adjuster is the lever that links the brake chamber pushrod to the S-cam shaft on an air-braked truck, trailer or bus, and it keeps brake stroke within its limit as the friction material wears. In plain terms, it turns the straight push of the brake chamber into the rotation that spreads th... read more
A slack adjuster and its pushrod work as one unit in an air brake system: the pushrod carries straight-line force out of the brake chamber, and the slack adjuster converts that force into the rotation that applies the wheel brake. The most important number to track is pushrod stroke, the distance ... read more
A Freightliner Cascadia brake chamber converts compressed air pressure into the mechanical force that pushes the brake shoes against the drum or the pads against the disc rotor. On a standard Cascadia, the drive axles use double-diaphragm spring brake chambers, usually marked 30/30, while the stee... read more
Slack adjuster adjustment is the process of setting the clearance between the brake shoes and the drum by repositioning the slack adjuster arm, ensuring the push rod stroke stays within the legal operating range. If you operate a truck, trailer, or bus with air brakes, checking and adjusting slack... read more
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