The world is divided into two types of drivers, that tightened the hand brake by pressing the unlock button, and tighten, leaving rings that characteristic crack length. The reason why the first press of the unlock button, the same that we used to remove the parking brake and to resume the march, passed by to avoid unpleasant noise, and often the belief that they are protecting the parking brake fault. But what we are really damaging our parking brake if you pull the lever without pressing the button?
The parking brake is equipped with a system that tightens the brakes, and locks them in that position thanks to a ratchet, a toothed disc and a tooth to allow for movement of the disk and the lever in one direction and blocked in the contrary, as a ratchet.
why you hear that crunch when we strained the hand brake? The reason is not other than the nature of the mechanism which employs a hand brake or parking lot. Under the lever, we find ourselves with a ratchet, a toothed disc and a tooth that fits perfectly into its notches to retain it. The mission of a ratchet is simple, allow the movement of the toothed disc in a single direction, and hold the contrary, except you press the unlock button, that replicates the tooth and allows us to move the lever, and thus the disk, in both senses.
that means, by pressing and without pressing the button, the lever can be moved in one direction, to tighten the parking brake. For destensarlo, by against, we can only perform the maneuver by pressing the button, releasing the tooth of the ratchet. The mechanism is exactly the same as that used by a ratchet, that when you tighten resistance, and to move it in the opposite direction do not tap the nut to facilitate our work, and vice versa if the ratchet is on the way to loosen lug nuts.
The ratchet has been designed precisely for that tensemos the handbrake without pressing the button, but is it advisable to do so? is it recommended to press the button?
In the top video, channel Engineering Explained (if you like these things I highly recommend that you suscribáis), we explain better how it works. In him we can already see that the sound of the ratchet has nothing to do with the mechanism that actually applies the brakes. The sound of the ratchet is due to the system that is in charge of retaining the lever, and thus the parking brake is in the position desirable to avoid that the car will roll down a slope.
The reality is that ratchet has been designed to move the lever making noise, without pressing the button. Like a ratchet spanner has been designed to make noise and to facilitate the maneuver of loosening or tightening a nut. Therefore, theoretically there is no problem in pulling the lever without pressing the button, but of course the friction is greater than if you press it, and the friction leads to wear, at a minimum. In any case I agree with the protagonist of the video in which a ratchet, except for problems in the mechanism, it should withstand the life of a car, and although the friction generates wear and tear, should not reach the point at which a breakdown occurs. The problems with the parking brake most common are produced by lack of stress, or other problems with the brakes, which locked the wheels.
To tighten the hand brake by pressing the button we must also be careful, especially if we do the maneuver very fast. It is important that soltemos the first button, to lock the toothed disc, and after the lever, and not the other way around. Doing it in reverse will always run the risk of generating friction in the ratchet, even more than if you do not press the button, or even that the tension of the parking brake is smaller than the one we were looking for.
fortunately, or unfortunately, very soon we will no longer have to worry about it, in both the parking brakes manuals have fallen into disuse with the arrival of the parking brakes, electrical.
Source: Engineering Explained | Via: Lifehacker