The slack adjuster is the component that is used to adjust the brakes using transfer of torque by converting convert linear motion into the rotary motion of the S-cam.
One source claimed the brake shoes press against the brake drum, applying the brake. When the brake lining or brake pad wears, the gap between it and the brake drum increases. Automatic slack adjusters have an adjusting mechanism that adjusts for brake lining wear.
A Slack Adjuster is designed for use in S-Cam brakes which is mostly used in trailer and trucks, that is commercial vehicles. You can also call it an adjusting nut that is present on the back side of the brake drum and is used for brake adjustment.
Also, what is a slack adjuster on a pushrod?
Automatic slack adjusters are fast becoming a more reliable and consistent operational part, which is why Wheelco recommends using this type of slack adjusters. There are two types of slack adjusters: the stroke and clearance adjuster. The stroke adjuster measures the stroke of the pushrod.
The slack adjuster assembly transmits the braking torque to the S-cam and facilitates the adjustment of clearance between the brake lining (brake pad) and the brake drum. It is mounted on the S-cam shaft.
The slack adjuster is located on the air canister on the axle housing near the wheel. On vehicles with drum brakes, it is between the pushrod and the S-cam.
Do you have to manually adjust slack adjusters?
Therefore, it does not require periodic manual adjustment and is highly recommended not to adjust unless absolutely necessary or in an emergency situation. Do not manually adjust automatic slack adjusters after initial adjustment unless you are doing a complete brake overhaul. Never use an impact wrench to adjust.
Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
This of course begs the inquiry “Do slack adjusters need to be serviced?”
However, all brake systems, whether manual or automatic slack adjusters, should receive regular maintenance checkups. When you sign the trip inspection form, you need to check the brakes to make sure they are in adjustment. This means marking and measuring the brake stroke which is part of the trip inspection.
How do I choose the right slack adjuster for my bike?
Ensure the adjustment arm is firmly fitted to the bracket. Automatic slack adjusters are fast becoming a more reliable and consistent operational part, which is why Wheelco recommends using this type of slack adjusters. There are two types of slack adjusters: the stroke and clearance adjuster.
You could be asking “When is a slack adjuster good for brake stroke indicators?”
Some say if the slack adjuster is at no more than a 90-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.