![]() ![]() I understand that he is just doing his job, but I was doing mine. But the mechanic wasn't having any of that and said that it had to be done. Secondly, which sounds a bit self righteous, but I religiously grease my truck bumper to bumper weekly and know that my brakes are in perfect working order. I took a bit of exception to this for a couple reasons, number one, I was under the impression that loosening the adjustment nut on auto slack adjusters against the ratcheting mechanism can round out the teeth and cause the auto adjusters to fail. So for the next few weeks EVERY truck that comes in for a service, they want the adjustment nut on the brakes loosened one full turn against the ratcheting mechanism, everything greased, and then readjusted. I work for a fracking company and a few days ago I brought my truck over the pit for a service and a mechanic proceeds to tell me that they have been having problems with brakes failing because guys have not been maintaining their brakes properly. This will help increase their longevity by reducing wear.So we're having a debate at work right now on proper methods for adjustment and maintenance of automatic slack adjusters. Make sure that after application, repeat the greasing procedure after every 25,000 miles have been driven using the same slack adjusters. Right after installation and adjusting the angles, apply generous amounts of grease to the slack adjuster mechanism. It is recommended that slack adjusters be well lubed up at all times. Set all the slack adjusters to this angle. This angle even on brake application should only be slightly higher than 90 degrees. Your friend must apply the brake while you check the angle that the slack adjuster arm and the actuator push rod are making. Now, after your installation is done, you have to check the adjustment of the slack adjuster. Line the yoke pin hole with the arm hole and install the yoke pin and the cotter pin into the mechanism. ![]() The adjustment screw on the slack adjuster can be rotated. ![]() These are parts of the assembly of the slack adjuster. Make sure that it is a tight fit as it has to hold the slack adjuster into place at all times during brake operation. Step 3 – Install Retaining MechanismĪfter you have installed the slack adjuster onto the brake cam shaft, re-install the retaining mechanism on the end of the brake cam shaft. Make sure that the adjustment screw of the slack adjuster is only so tight so that there’s room for you to add grease. This angle should be maintained when the brakes are not applied. ![]() The trick is to make sure that the slack adjuster arm and its actuator push rod that helps close the adjuster on application of brakes is at a 90 degree angle. When it has slid on completely, rotate the slack adjuster until it is secured into place. To install the slack adjuster, first slide the adjuster on to the spline end of the brake cam shaft. Use the mechanic’s kit for appropriate tools to remove the mechanism. To install the slack adjuster, first remove the retaining mechanism from the brake’s cam shaft. It is installed at the end of the brake cam shaft. Your vehicle’s brakes come with a retaining mechanism. ![]()
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