Adjusting arm, also called brake clearance adjusting arm, the main function is to adjust the brake clearance.
In the process of vehicle braking, the brake components will continue to wear, the gap between the brake drum and the brake shoe will also increase to varying degrees, resulting in the formation of overly lengthy pedal, brake chamber thrust decline, resulting in brake lag, brake force decline, wheel deviation, vehicle tail swing and even brake failure and other problems.
In order to ensure driving safety, maintain the stability of brake pedal travel and the balance of work between brakes, brake clearance needs to be adjusted continuously.
Semi Trailer supplier says Automatic adjusting arm refers to the vehicle adjusting arm that can be automatically adjusted according to the wear and tear of the brake shoe and brake drum to ensure that the brake drum and brake shoe are constantly in the best gap set.
Its working principle is simple, that is, at the time of design, the brake gap is set. If the gap is exceeded in the process of use, the self-adjusting arm will drive the internal one-way clutch when the brake return will be tiny, so that the brake gap is always kept in the preset range.
Compared with manual adjusting arm, automatic adjusting arm has the advantages of excellent consistency of brake clearance adjustment, short braking stroke, large torque, stable effect, minor gas consumption, no manual intervention and so on. As early as more than 10 years ago, it has become the standard configuration of heavy vehicles in Europe and America.
Thus, the use of automatic adjustment arm of the vehicle, can manually adjust the brake clearance? In other words, can automatic arm adjustment be used as manual arm adjustment?
The brake clearance can be adjusted if the worm bolt on the self-adjusting arm is rotated by a wrench. But in general, owners are not advised to do so, because manual adjustment for the internal mechanical structure of the self-adjusting arm damage is extremely large, manual adjustment several times may lead to transmission mechanism damage.
In addition, some owners ask whether they can remove the control arm of the self-adjusting arm and then use it as the self-adjusting arm. This is also not possible, because the most common cause of damage to the adjusting arm is locking failure and can not play the role of fixing the gap. If the control arm is removed, the internal mechanism of the automatic adjusting arm will not be able to meet the self-locking conditions. When the vehicle braking, the internal mechanism of the self-adjusting arm will rotate, and the braking gap will become larger and larger over time, which will eventually lead to braking failure.
It is worth noting that there are differences in the matching self-adjusting arm of different models of axle, especially its preset brake gap. The owner had better not modify it without authorization, otherwise it is likely to lead to overly large or too tiny brake gap. If you want to replace it, it is recommended to confirm the model of the self-adjusting arm, and it is best to use the original parts.
Maintenance and maintenance, self-adjusting arm is relatively simple, under normal circumstances is every three months to check once, every 20,000 kilometers or every half a year to add grease.