The problem is, how do you know that two brakes are adjusted well below the limit and three are over-stroking by an eighth of an inch?
You cannot tell, but an inspector can. Some say if the slack adjuster is at no more than a degree angle to the push rod when the spring brakes are applied, the adjustment is good. At the same time, many believe that if, when using brake stroke indicators, the pointer is inside the markers when the spring brakes are applied than the adjustment is good.
Unfortunately, neither is true, and neither way will measure the brake stroke accurately. A large number of trucks are taken out of service due to brake defects and many of those are due to issues with adjustment. According to Kraus, that directive requested a change to service literature on the topic of ASA adjustment. A manual adjustment gives drivers false sense that everything is working correctly.
Keith McComsey, Bendix Spicer Foundation brake director of marketing and customer solutions, says the name speaks for itself. There may be times, however, when manual adjustment is required — like during ASA installation and when brake repairs and overhauls, such as relines, are performed.
Of the 67, vehicles inspected in the U. Brake-related issues account for 45 percent of those OOS infractions — making them once again the top cause for inspection failures. Some of those OOS violations stem from manual adjustments made on automatic slack adjusters, which can lead to ASA failures. Replacing an ASA due to an OOS may get your vehicle back on the road but the other foundation components should be studied at the earliest possible convenience to verify the braking system is in acceptable condition.
ASAs have been in the market long before they were first mandated in For instance, Haldex rolled out its first U. Like many other components that hit the market, ASAs were designed to improve safety and lower maintenance requirements for fleets. Regular maintenance and accurate trouble-shooting remains key to a long, safe service-life devoid of OOS infractions.
So, cleaning the purge slot on the boot, and adding grease until the old grease is fully purged and you see new grease exiting the purge hole is a requirement. A grade 2 lubricant endorsed by the National Lubricating Grease Institute is recommended for preventive maintenance inspections on Bendix ASAs approximately every three months or 30, miles.
As part of pre- and post-trip inspections, drivers should check the slack adjuster for correct operation, lose or missing hardware, a missing cotter pin, bent or damaged components such as the control arm or attaching anchor brackets, and worn clevises, clevis pins and clevis pin bushings. Fleets that run lightly loaded are more susceptible to vibration, which Kay said can accelerate brake stroke issues.
McComsey also recommends checking the brake shoe return springs to ensure a proper return to the zero-stroke position. However, segments that feature more starting and stopping would need a maintenance cycle that includes ASA replacement.
Proper maintenance of automatic slack adjusters also means no manual adjustments. McComsey said there are many reasons an ASA may fall out of adjustment, but it is unlikely that a manual adjustment will correct the problem.
Proper maintenance Keith McComsey, director of marketing and customer solutions for wheel ends at Bendix Spicer Foundation Brake , said ASAs often are not greased regularly during scheduled maintenance and inspections.
No manual adjustments Proper maintenance of automatic slack adjusters also means no manual adjustments. Related Stories.
Brake adjustment a sneaky Top 5 truck out of service violation thanks to misdiagnosis and improper shop practices.
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