研究 Apex Braking/Trail Braking… Under Special Circumstances

研究 Apex Braking/Trail Braking… Under Special Circumstances

Refer to: 雨戰-CKK RD2,三水森林賽車場

Apex Braking or Trail Braking (mostly known as Trail Braking) is a technique where the brakes are used beyond the entrance to a turn and are gradually released up to the point of apex. For example, the braking pressure trails off after turning in has begun, allowing less abrupt and more accurate final corner entry speed adjustment.

There are risk in this technique of course (reference to Wiki)

–          “There is risk with trail braking because excessive use of the brakes can result in a loss of grip as the tire’s adhesion is split between braking and cornering forces. Effective trail braking requires finesse from the driver, which can be difficult to learn.”

In physics terms, the longitudinal force (decelerating force – 減速力) combined with the lateral force (cornering force – 拐灣力) can easily overcome the tire traction (咬地能力) if it’s not controlled perfectly. Refer to below:

I would personally not recommend to use this technique, especially if you’re not familiar with the car’s setup and the track. I only used this technique in 3/7 三水 CKK Championship, because of the “special circumstances” exhibited on the day; 1) Continuous rainfall and 2) Wet track using dry tires.

As I have explained to some, before this post, under normal circumstances, this technique will raise the risk level by exponential rate. If you can do it all the better (and I have seen many who can do this exceptionally well), but there is a balance between human stamina, consistency and driving at the limit. What I encountered on the day was a very fine line of traction (like walking on a wire) with great amount of skidding distance.

An adaptation of this technique worked a wonder because at the high speed sectors, I can gain a higher entry and exit speed while driving on a safer path. By braking into the corner, combined with some precision work on the steering wheel, you can control the vehicle’s line more directly to your desire, while avoiding the risk of braking too late, over speeding at corner and excessive acceleration at corner exit.

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