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Question:

Why do you have to use the front brake on a motorcycle 70 percent of the time?

Excuse me if im wrong, but from my previous studies in physics and riding a bicycle(since i am only 15), applying front brakes may provide some efficiency in stop the object faster but in reality its very dangerous as the motorcycle could lock up and flip over, thus leaving you in a bad situation. Why not just use the rear brake all the time? It seems much more naturale oui?

Answer:

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Because at speed, the front brakes being applied compress' the front forks (giving leverage to the front wheel) whilst lifting the rear. Sort of digging into the road. This gives more pressure and grip to the front wheel. Along with two big rotors and two calipers on the front wheel gives it more stopping power. Brakes should always be applied smoothly and the more pressure you apply, the tighter the brakes will be. If you grab the front brake, you will either A- lock the wheel causing the front wheel to lose traction and take a spill or B- lock the wheel while maintaining traction, and flip the bike over the handlebars. This applies to the rear wheel as well. Obviously you won't fly backwards but you will lose traction, potentially causing a fish tale and crash. Generally when I'm coming to a stop. I apply a bit of rear brake ( again, giving leverage to the front) then apply the front until the stop is complete. There are infinite scenarios on which brake to use and when, but that's the absolute basics of it.
You read the facts wrong, USE the front brake 100% of the time, it does 70% of the work because the weight transfers to the front tire. The Flip over was a rumor from what we called English racer bicycles in the '60s, the light weights they use in Tour de France type racing, it was rare then and it took 40 years of brake and weight shaving work to get a motorcycle to do a Stoppie. Go find a quiet road and put up a sign, stick, or a flag, go back up the road and ride down at 30 MPH, Hit the FRONT brake just hard enuf to shift the weight forward, then squeeze it hard, but safely, put out a marker. Go back and do it with the REAR brake and mark that. Go back and do it with BOTH brakes, mark that. Count the steps to the FRONT brake marker, continue on to the REAR brake marker. It WILL be that way, Both,Front and down the road Rear.
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Bicyclists and motorcyclists rely on the front brake because as you brake, weight transfers towards the front due to inertia. This transfer of weight unloads the rear wheel, traction diminishes rapidly, and the rear tire's ability to stop the bike will pretty much become nil. It's quite easy to lock up the rear in normal braking due to this. When firmly, but not abruptly, applying the front brake, the weight of the bike loads more onto the front tire and actually decreases the chance of it locking, increasing that tire's ability to hold and stop the bike. Now sure, it's safer in that you won't flip, but when you need to stop before next Tuesday (or that car stopped in front of you), you've got to become more skilled at braking with the front. Properly done you will not flip the bike, and will stop in the shortest amount of time. There are many videos on youtube that show the differences in front vs. rear braking, and I recommend you watch them. Of course, all of this depends on conditions. If it's wet I'll rely a tad more on the rear and brake sooner, but I will still use my front for all primary braking situations.

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