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We’ve Added a New Brake Test to Our Repertoire

Jeff Lincoln June 11, 2022

Marc UrbanoVehicle and Driver

From the June 2022 issue of Car and Driver.

Vehicle and Driver begun testing vehicles’ acceleration way again in the 1950s, but it took us a 10 years to cease. That is, to evaluate the length essential to halt. We initially executed brake exams at 80 mph, but in the early 1970s, we settled on 70 mph. Back again then, braking distances averaged all around 200 ft, severe fade transpired often, and automakers experienced yet to implement anti-lock technology to enhance the braking force at every get hold of patch. Present-day components would make fade uncommon in our common six-end schedule. And final year the normal halting distance shrunk to 168 ft, even as examined curb weights have ballooned by just about 50 percent in the past 5 a long time to pretty much 4400 lbs. Functionality-oriented autos do even far better and usually cluster all over 150 toes from 70 mph. To further obstacle those vehicles’ fortified brakes, we’ve began executing 3 stops from 100 mph in addition to the 70-mph bogey. Kinetic vitality swells with the sq. of pace, so a prevent from 100 mph can take more than double the energy as from 70, building this a complicated examination that should really make additional than a couple feet of separation among effects.

Let Me End You Suitable There

Any braking examination is a measure of how speedily the full braking system will get up to peak performance and stays there during the quit. A automobile with a strong procedure need to prevent from 100 mph in about double the length it does from 70. But a amount of things have an impact on the final results. For example, a car or truck with aerodynamic raise will have a lot less traction obtainable early in a prevent, while a car or truck with downforce will reward from a great deal of preliminary bite. As in all braking assessments, tire traction is a big contributor to how promptly a automobile can gradual down. In 100-mph tests, significantly with cars sporting all-period tires, we once in a while recognize grip slipping off before any brake-pedal softness. And then there is certainly how very well the brakes drop heat. Stopping a 6781-pound Ram 1500 TRX from 100 mph causes more than enough brake fade to additional than double its halting distance from 70 mph. Fade has an effect on extra than just large pickups—the brakes on the Acura TLX Type S and the Cadillac CT5-V also wilt from triple-digit speeds. We’ve just lately started to compile 100-to-zero information, and for now, Porsche sits atop that leaderboard with the 718 Cayman GT4 RS, which took only 242 feet (with an regular of 1.38 g’s), from 132 ft from 70 mph (1.24 g’s).

Best New Sports Cars of 2022Read more

2022 porsche 718 cayman gt4 rs 70–0 vs 100–0 comparison

new brake test

Illustration by SinelabCar and Driver

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