The release location varies depending on the maker – for the Bendix® Versajust® LS™, it’s on the boot for others, it’s a hole in the casting – and manufacturer instructions will offer advice on how much grease to purge from the adjuster, and what lubricant to use. Just locate the ASA’s grease fitting, attach the hose from a grease gun, and inject new grease until old grease is forced through the release opening. Lubrication is a simple process, regardless of the adjuster’s manufacturer. Both are necessary to keep the ASA working properly to maintain correct brake stroke and provide optimal stopping performance. Greasing the ASA serves two vital purposes: Forcing the new lubricant in purges the old grease from the adjuster, along with any water or contaminants that have found their way in and it protects the adjuster’s internal gear sets, clutches, and other components from wear. “And slack adjusters that don’t perform properly through lack of lubrication can have a direct impact on both safety and regulatory compliance.” Proper maintenanceĪutomatic slack adjusters often are not greased regularly during scheduled maintenance and inspections.Īll too often, we see automatic slack adjusters that are not being greased regularly during scheduled maintenance and inspections,” said Frank Gilboy, product manager, automatic slack adjusters at Bendix Spicer Foundation Brake LLC, a joint venture between Bendix Commercial Vehicle Systems LLC and Dana Commercial Vehicle Products, LLC. The automatic slack adjuster is designed to compensate for brake lining and drum wear to maintain a constant actuator stroke. When the brake is applied, a rod pushes out on the slack adjuster, which then turns the S-cam to force the brake shoes apart to apply the friction necessary to slow the truck. Slack adjusters can often be viewed as the part that can be forgotten, and according to an article in CCJ Digital, brake adjusters are very often not given the regular maintenance they need. The automatic slack adjuster (ASA) is an important part of keeping truck brakes operating at peak performance and up to regulatory standards and like other parts, inspection and lubrication are critical for optimal performance.
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