already we ’ ve seen Volkswagen choose for rear drum brakes on its ID.3 electric think up and ID.4 electric SUV, and it ’ s only likely to become more common as carmakers roll out their battery-powered vehicles .
Why ? In a petrol-powered car, the brakes do most of the bring when you want to slow down, save for a morsel of engine brake .
In an electric car, regenerative braking flips the handwriting.
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When you lift off the accelerator in an electric car, the motors basically turn into dynamos .
rather than converting all the energy spent getting up to speed into heat and brake debris, regenerative brake feeds some of it back to the battery to help eke out extra range .
It ’ s a cagey way to go far on a cathexis, and lets owners do most of their city drive using entirely one pedal point, but it besides means the brakes in electric cars need to be engineered differently .
With less heat being put through them less frequently, EV brakes can be smaller and lighter. They need to resist corrosion if they aren ’ metric ton used for farseeing periods of time, and have to integrate with other vehicle systems in a new way .
One of the solutions from suppliers such as Continental is drum brakes .
“ The drum brake is addressing many of the issues we ’ re seeing on the market today, ” said Jean-Michel Verdier, question of research and development for hydraulic brake systems at Continental .
Drums are lighter than magnetic disk, and can be fully enclosed to stop corrosion.
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They don ’ t have the same top-end performance as disk, but front magnetic disk and rear drums backed by electric motors have more than adequate power for the average class car .
Mr Verdier says carmakers are “ right-sizing ” the brakes for their electric car, and drums are often the solution .
He besides pointed to upcoming european regulations governing everything from exhaust gases to particles from brakes and tyres, likely from 2025 .
Enclosed brake drum brakes “ address one of the cardinal topics OEMs are facing today ”, he said, by emitting less debris into the air .
Continental is mindful of the “ perception ” drum brakes are deficient to discs, and says it ’ s “ working on it ” .
“ We are working not only on the communication and the change of percept of the public, but we are besides working on enhancing the operation, ” Mr Verdier said .
Current carbon ceramic brakes
A swing back towards drums is share of a broader strategy that will finally see Continental delivering ‘ dry brakes ’ that do away with hydraulic fluid and become in full ‘ by-wire ’, although it won ’ triiodothyronine happen overnight .
It besides plans to make its braking systems more modular, so carmakers can pick and choose the components that best befit them, and have them communicate with all the other vehicle systems .