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In addition to the new pads, Bendix brake pad replacement kits include pad springs, pad retaining bars, and retaining bar pins, clips, and washers.
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They will go in only one way: with the friction facing the rotor and the pad springs at the top. When the inspection and any component replacements are complete, make sure the tappets are fully backed off so they are flush, and slide the new brake pads down into position. Note that slide pin lubrication is not required: Air disc brakes are lubricated for life and do not need grease fittings or oil spray as long as the components remain uncontaminated.
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The free Bendix On-Line Brake School courses at include a video on replacing these components. Use the brake manufacturer’s service data sheet to determine the right kit, which should include the components as well as any special tools to ensure that new bushings are set at the proper depth. If components are damaged, service with a genuine Bendix service kit.
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A retaining bar across the top of the brake pads holds them in place: Use a small pair of pliers to remove the spring clip from the pin fastening the retaining bar, then remove the washer from the pin as well. Once the shear adapter is fully backed off, the brake pads can be freed for removal. The adjustment mechanism is not replaceable, so if it goes bad, the entire caliper will need to be replaced.” “The shear adapter is designed to fail in the event of over-tightening, preventing damage to the adjustment mechanism itself. “It’s important never to turn the adjuster without the shear adapter installed,” Pfost noted. A chain connects the pair of tappets to extend and retract them simultaneously. Using a 10 mm socket wrench or a ratcheting box wrench on the adapter, turn the adjuster counterclockwise – a clicking noise indicates that the tappets are “backing off,” or loosening the pads’ grip on the brake rotor – until it stops. Once the wheel is off, exposing the wheel-end, find and remove the cap covering the shear adapter on the brake caliper. If the parking brake is on, it will need to be released or caged so that the axle rotates freely. Prepping for an air disc brake pad change is simple in that the brakes are the same whether they are equipped on a steer, drive, or trailer axle. “Faster service times equal greater vehicle uptime, as do the longer life cycles of air disc brakes.” “Air disc brakes offer quick and easy pad changes – about 15 minutes once the wheel is removed – and don’t require regular lubrication,” said Kevin Pfost, Technical Services Coordinator, Bendix Spicer Foundation Brake LLC (BSFB). As part of the Bendix Tech Tips series, Bendix offers a step-by-step look at replacing air disc brake friction, along with preventive maintenance tips easily undertaken during the process.
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As the performance benefits of air disc brake technology continue to gain the confidence of the commercial vehicle industry, fleets and drivers that have already adopted air disc brakes are seeing firsthand the long-term service advantages.