The life of an exhaust system
Solid Or Ventilated Disc Brake & Why ?
The design of brake rotors has been evolving since their introduction, with the main objective being to reduce the level of heat crazing and cracking that occurs. The latest commercial vehicle designs now separate the braking face from the mounting hub (floating, flat design). To help reduce this issue and whilst this has been relatively successful, it potentially creates some other operational issues. It also doesn’t help to reduce the cracking of earlier conventional designs.
What’s the difference between ventilated and solid discs?
Ventilated discs are designed to run cooler than solid discs in normal operating conditions. Most modern trucks have ventilated brake discs but for some off-road and older models, solid discs or rotors are an option.
On some operations, solid disc brakes can prove the most economic choice. Solid brake discs do not increase brake fade nor operate at significantly higher temperatures. They incorporate more metal which helps to stabilize the temperature variations and minimize the likelihood of the disc becoming warped by thermal extremes.
Unlike ventilated discs which can develop hot spots, there is less variation in temperature across a solid disc, so it is ideal for applications where repeated harsh braking cannot be avoided – in off-road construction and quarry work, for example. Solid discs typically cost about 30% more than ventilated discs, but life-cycles can be four times longer.
To collaborate feedback from operators that its solid discs delivered similar braking performance to ventilated ones with less heat crazing or cracking, Some test has been made undertook direct comparison tests conducted at an independent UK facility using the same test protocols as laid out in the ECE R90 certification procedure.
Four brake rotors, two solid and two vented along with two sets of brake pads underwent the following tests:
Performance check – Dynamic Friction performance: 250 stops decelerating from 60kph to 3kph. Checks for deceleration, fade and final temperature. Both rotors performance within acceptable performance parameters.
Thermal Fatigue Test – Tests the disc to destruction to assess the brake rotor’s thermal capabilities, which lasts 15 cycles.
Pad wear tests – After cycle seven, the level of wear in the solid brake rotor is 6.5% less than in the vented rotor, and brake pad wear is 21% less.
If a customer has specific operational issues, where the brake rotor is subjected to high operating temperatures, which result in accelerated/premature heat crazing and cracking, then we believe the best solution is to fit a solid version and use a quality brake pad such as our Brembo Disc Brake Kit.
5 Reason Why Brembo Braking System is Better
If we are talking about braking performance, then size does count, without doubt. The braking torque of a disc brake is the result of the product of three factors: the effective radius of the disc, the clamping force of the caliper and the friction coefficient. The larger the disc diameter, the greater the braking torque. Increasing the diameter of the disc, in fact, increases the effective radius and thus, keeping the other variables unaltered, the braking torque increases. The dimensions of the brake pad also count. The reason is found in the heat exchange: a wider pad facilitates the disposal of heat and reduces the inclination of the braking system to fade and therefore makes it possible to apply the brakes often in quick succession compared to a smaller pad. Also, the number and diameter of the caliper pistons is directly proportional to the braking torque. Both act on the clamping force and hence the greater the clamping force of the caliper the greater the capacity of the caliper will be to exert a force on the pads and the more effective the braking will be.
Of course it isn't possible to increase the size of the braking system as you like, because increasing the size of the system components also increases the weight of the unsuspended masses resulting in the decay of the car's overall performance. For this reason one of the main characteristics of the Brembo braking system is the lightness, which is constantly maintained by Brembo in every component of the braking system.
Take the Brembo ceramic carbon discs for example, which weigh about half that of traditional discs of the same size, thus allowing an advantage in the reduction of non-suspended masses. Again in terms of lightness, the Brembo aluminium brake calipers are able to guarantee the best weight / stiffness ratio thanks to specific design methods designed to achieve the utmost optimization of the shape and thanks to a long and laborious testing phase both on the bench and on the road). The Brembo fixed calipers, in addition to their characteristic performance and design, are able to confer weight reduction and residual torque advantages to the cars, resulting in lower fuel consumption and therefore lower emissions.
As previously explained, the friction coefficient affects the braking torque. Equal to the dimensions, the material used is also a discriminating factor. The Brembo carbon ceramic discs, for example, have a higher friction coefficient of about 12% compared to cast iron.
Equal to the material used, the surface finish of the disc is also decisive for the friction exerted. The drilled and slotted discs ensure, from the initial braking stages, a greater grip and a faster and more effective response of the braking system with respect to a standard disc. In terms of friction material, the compound with which the pads are made is not to be underestimated.
Brembo has a dedicated structure for the study and production of brake pads, which aims to produce this fundamental component of the braking system, a long side the more traditional calipers and discs that historically characterize Brembo's know-how. Thanks to constant research, today Brembo is able to develop brake pads with "tailor-made" materials for each individual braking system, ensuring the maximum degree of integration between pad, disc and brake caliper.
A braking system consists of several components that must work together with the highest level of integration and efficiency possible to ensure reliability, comfort and durability over time. Brembo can now guarantee this full integration thanks to its exclusive system approach, which entails the in-depth knowledge of all the elements involved in the braking action.
In fact, Brembo is among the few manufacturers able to operate with system logic since it produces all the components involved in the braking action internally (discs, calipers, pads and hub carriers) and assembles them to provide their customers with complete brake modules that meet all the requirements of the world's most exclusive and high performance cars.
To constantly follow the evolution of transport means and to seek the best braking system for the new vehicles of the future. This is the guiding principle of Brembo's R & D activity, according to which each single component of the braking or adjacent system (caliper, disc, pad, suspension, control unit) is complementary to the other for the optimization of the braking operation that is constantly refined in all its aspects.
Just as in competitions, effective braking on the road does not depend solely on the characteristics of the front system. Especially for the more sporty cars, characterized by a more balanced distribution between the two axles, the rear braking system is of major importance. Brembo collaborates with the most prestigious global car manufacturers with integrated engineering services that accompany the development of new car models. In this way it is possible to offer more and more integrated and efficient braking systems to motorists, as is the philosophy of the Brembo Group, thus guaranteeing the best braking performance possible. To obtain breathtaking braking, the rear braking system must also be studied in detail. And that's exactly what happens on the most important sports cars that choose Brembo braking systems at the front and rear to ensure optimum braking balance and reduced stopping distances.
So after all that say above just like the old words saying "Better Be Safe Then Sorry"
Here at BMW Parts Co we have so many Brembo Disc Brake Kit to choose from, and with Professional help, you have no hassle and worry free on choosing the right parts for your BMW.
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