How to adjust the brake clearance caused by the thinning of brake pad?
TIME：2020.02.24
How to adjust the brake clearance caused by the thinning of brake pad? At present, most of the medium and heavy trucks on the market use air brake, and most of them use drum brake, camshaft type is the majority. The brake system accounts for a large proportion of accidents caused by long-distance driving, such as tire blowout, vehicle fire and car crash. Every driver should always check the brake system, especially pay attention to the brake clearance and the thickness of brake shoes. A method of adjusting the clearance of a camshaft brake. The Compressed air enters the brake cylinder, and the push rod of the brake cylinder is pushed outward by the action of air pressure, driving the adjusting arm, which drives the camshaft to rotate, the S CAM at the other end of the camshaft pushes the brake shoe outward, making contact with the drum to generate braking force, which slows the vehicle to a stop. After a period of driving, the brake shoes will gradually become thinner and the brake clearance will become larger and larger. If the brake cylinder is not adjusted in time, the brake shoes and the brake drum will not touch or there will be no force on contact, there's no stopping it. The key component that can be adjusted is the component called the adjusting arm. By adjusting it, the brake clearance can be adjusted. So, how to adjust it? Many drivers like to leave the dirty, low-tech job to the mechanic. In fact, the brake clearance is really low-tech, but if you make sure your car is OK, you have to take care of it. The adjustment arm is separated from the manual adjustment arm and the automatic adjustment arm, which can be distinguished from several small features. The manual adjustment arm has long push-out time and good reliability. The brake clearance can be adjusted by means of the adjusting nut in the upper locking device: Open the observation hole on the dust cover and observe the rotation direction of the adjusting nut (usually clockwise) which reduces the brake clearance, stop when there is no gap and the force is obviously greater, then turn 180 in the opposite direction and you are set. The same is true of the self-adjusting arm, except that the self-adjusting mechanism makes the nut click. Automatic adjustment arm does not need manual adjustment, but most of the automatic adjustment arm on the market quality is worrying, some will lose effect, and even some will appear brake gap smaller and even the phenomenon of wheel traction. At this time need to check whether the adjustment arm is working properly, you can use a ruler to measure. Adjust the brake clearance according to the above method, then release the parking brake, press the foot brake, keep still, need another person to measure the length of the push rod of the brake cylinder, the length of the push rod should be the same or similar, if there is an abnormality on one side, it's GonNa need a lot of attention
