Rotate the manual adjusting bolt clockwise (or counterclockwise with ArvinMeritor products) until the brake lining is pressed firmly against the drum. Build air pressure in the system and uncage the repaired brake if you caged it earlier.
SLACK ADJUSTER SOCKET INSTALL
On Haldex adjusters, install or connect the anchor bracket and tighten the fastener.Ĩ. Apply anti-seize compound to the pins and install them. Manually adjust the slack until its clevis and link holes align with those in the clevis. Each supplies a template that will help ensure the proper mounting angle between the adjuster and pushrod. (Welded clevises cannot be replaced independent of the air chamber.) Apply anti-seize compound to the pushrod threads and spin on the new clevis according to manufacturer’s guidelines. If you’re changing brands of adjusters or just replacing a clevis, loosen the jam nut on the air chamber’s pushrod and unscrew the old clevis. Quick-connect clevises loosen over time, and will contribute to longer pushrod travel, which could be costly during a CVSA inspection.ħ. You should also remove the quick-connect clevis, if one was attached to the failed slack, and replace it with a standard threaded type. Finally, examine the brake chamber for cracks, excessive corrosion, bent pushrod and egg-shaped clevis pin holes. Also check the S-cam to make sure it is straight and that its bushings and seals are intact. A lot of lining nowadays is marked to indicate when replacement is necessary. Inspect the foundation brakes to ensure the lining is still suitable. By the time a slack adjuster fails, other components in the brake assembly are probably also worn. Parts that have been in service a long time or inadequately greased will often need to be coaxed off with a large hammer, puller or acetylene torch.Ĥ.
This damage might not be a problem, however, if you’re discarding the slack being removed. Use an impact wrench, because this task will destroy the internal clutch mechanism found in most automatic slacks. Rotate the manual-adjusting bolt counterclockwise (or clockwise with ArvinMeritor products) to back off the slack adjuster so it separates from the clevis. If you must leave the brakes applied, which would be the case with an unattached trailer, you will need to cage (or manually retract the main spring of) the air chamber attached to the slack adjuster being replaced.ģ. Park your truck or trailer on a level surface and chock its wheels. The followig information applies to drum brakes.ġ. Instructions are also packaged with each new adjuster. Product-specific information is available from the manufacturers’ websites. Usually, the biggest challenge is loosening the old slack’s grip on the S-camshaft. Without difficulties, slack adjusters can be swapped in less than 30 minutes, not counting time spent chasing parts or drinking coffee. The benefits of extended longevity are something to consider the next time a scale master directs you to a waiting inspection lane.ĥ.Ě well-greased 10-spline S-camshaft without the slack. “If proper maintenance is routinely done, there is no reason that a slack adjuster shouldn’t last as long as the vehicle it’s mounted to,” says Gary Ganaway at ArvinMeritor.
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