“As their name suggests, ‘directional pads’ must be installed in a specific direction to ensure optimal noise performance. The addition of a cut-out allows the piston to push the brake pad at the optimal angle, reducing noise and aiding even pad wear. The shim, made up of finely tuned layers of dampening material bonded to the pad assembly, helps to reduce both the transmission and amplitude of vibration and acts as a thermal barrier, ensuring uniform temperatures across the pad, and in turn consistent brake torque. This helps to prevent the leading edge of the pad from lifting from the disc for maximum pad to disc contact, which encourages even pad wear and reduces both noise and vibration.įor its crescent directional brake pads, these have a crescent or half-moon shape cut out from the shim. The company’s chamfer directional brake pads have the chamfer between two adjoining faces, on either the leading edge or both edges of the pad. By introducing the pad to the disc at a gentle angle, the likelihood of both noise and vibration is significantly reduced for even quieter braking.” “We have two different types depending on the application, featuring either a chamfered friction surface or a crescent cut out of the shim, but both have to be mounted in a specific direction for optimal pad-to-disc contact. “We’ve invested significantly in the development of directional brake pads over the years, constantly evolving our offering,” said Marco Lagomarsini, Braking Category Manager, Delphi Technologies Aftermarket. One of the ways that Delphi Technologies has tried to tackle this issue is by focusing on its production of directional brake pads. Add to this greater emphasis on the whole in-car experience and noise issues are becoming an area of increasing concern for vehicle and parts manufacturers alike. Whilst the emergence of quieter, electric and hybrid vehicle technologies should, in theory, lower NVH levels, the reality is very different – the loss of the engine masking sound is simply exposing other areas such as suspension, heating and ventilation systems and braking – noises that may not have been obvious to the driver beforehand. With this in mind, noise, vibration and harshness (NVH) reducing technologies are becoming even more important. Offering significant benefits in terms of noise reduction at a time when powertrains are becoming quieter and more refined, the use of directional brake pads is increasingly common amongst vehicle manufacturers, as PMM finds out.Īlthough the majority of current advancements in automotive design revolve around enhancing efficiency and developing viable alternatives to traditional diesel or petrol engines, there is the general expectation that these should also have a positive effect on the driver experience, with the byproduct being a quieter, more relaxing ride.
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