Can auto slack adjusters be adjusted manually?

Auto slack adjusters also known as automatic brake adjusters, are components used in air brake systems of commercial vehicles. They are designed to automatically adjust the brake shoe clearance as the brake linings wear down, ensuring consistent and optimal braking performance. The purpose of this design is to maintain the proper gap between the brake shoe and the brake drum to prevent excessive wear and to ensure effective braking.
In general, auto slack adjusters should not be manually adjusted by hand. They are specifically engineered to self-adjust as needed, and attempting to adjust them manually can cause issues with the brake system, potentially leading to unsafe conditions. Manually adjusting the slack adjusters can result in brakes that are too tight or too loose, leading to uneven braking, excessive wear, or even brake lockup.