Chevrolet Captiva Vcdi For Sale From UK At Reasonable Price
The Chevrolet Captiva Vcdi For Sale Slows Down Or Stop Because Of Dissipated Power By The Brakes
The vehicle slows down thanks to the power dissipated by the brakes during the braking operation. This is an operation with high energy dissipation and, unlike what one might believe, the forces involved are truly enormous. If we wanted to tackle the question of the braking system of a vehicle as a whole, one should proceed by considering all those systems that have the task of slowing down and/or letting the vehicle remain in quiet conditions.
The Operations
It is often said that the drum brakes do not have the uniformity of operation of the disc brakes. This is entirely true and is inherent in the kinematic mechanism of the drum brake itself. When the wheel turns and the drum brake comes into operation, the jaw starts to press on the working surface of the drum itself. As the pressure increases, a sort of wedge effect is created so that the jaw opens until it causes the immediate locking of the wheel. This is also the reason why very often double pumping systems are used, i.e one lower and one upper piston. The second jaw, in fact, shows an opposite behavior with respect to the first, so that its braking action tends to decrease with the increasing braking action of the other.
The Developed Power
The friction material that is part of the jaws is fixed on their surface by nailing and gluing. Obviously, the braking action is entrusted to the friction generated between the gasket and the internal surface of the drum. From the energy point of view, one has a transformation of mechanical energy into thermal energy, that is heat. This is also the reason why lots of users, and sometimes even some operators in the sector, can never understand that in addition to the power developed by the engine, it would be very important to know the maximum power that can be dissipated by the braking system. Although they are two different energy transformations, both the power of the engine and that of the brakes must be carefully evaluated. In technical jargon, you may run into two definitions that have fallen into disuse today. The jaw that develops the greatest braking power, ie the one for which the wedge effect is created, is called the "self-braking jaw", the other is called the "hypo-stressing jaw".
The Disc Brakes
The concept behind the disc brake operation is completely different. The disc, made in the most common cases in cast iron, is fixed to the wheel hub using special screws. The portion of the brake that takes care of slowing down the rotation of the disc and therefore of the car, is the caliper and the latter, of course, is constrained to the fixed part of the group, i.e. to the hub holder. The caliper contains the two pistons which, by pressing against the pads, bring them closer to the disc. As for the drum brakes, systems have also been devised to improve heat exchange and heat dissipation. However, on lots of cars, the known self-ventilating discs are increasingly found, which have an empty zone provided with micro-fins between the two work surfaces of the disc. In some cases, there are also radial holes with the same purpose.
The Types Of Calipers
Speaking of disc brakes, you need to focus on the types of calipers, because the latter really makes the difference. The most common grippers are the floating ones. The latter is equipped with a single piston, with a pad that moves along the pressure axis, so as to adapt to the consumption conditions of the pads themselves. It is a very economical solution, which is generally reserved for low-mid segment cars. Going up in category, we find fixed calipers also with pistons, a system that improves braking performance in every aspect such as expressible power, uniformity of pressure and regular consumption of the disc and pads. The braking power is linked in a proportional way to the diameter of the disc, so the larger the disc and the greater the braking power expressed. So, they are basic components for driving safety, the brakes, as a whole, are often overlooked by the average user, who becomes aware of their consumption sometimes when it is too late and when the working surfaces of discs are also compromised.
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