Brake adjustment arm, also known as automatic brake clearance adjustment arm. Its characteristic is to ensure that the wheels have a constant brake clearance, ensuring safe and reliable braking; The stroke of the brake cylinder push rod is short, and the braking is fast and reliable; The brake cylinder push rod is always in the initial position before braking, ensuring the optimal braking torque; Make the braking effect of all wheels consistent and stable; Reduced the consumption of compressed air, extended the lifespan of air compressors, brake cylinders, and other components in the compressed air system; Reducing material consumption and extending the service life of brake components; Easy to install and use, reduces the number of manual repairs, and improves economic benefits; The adjustment mechanism is enclosed inside the shell for good protection, thus avoiding moisture, dirt, and collisions.