Old bikes can come with the lever on either side. Most bikes I have ridden over the years have the front brake lever on the left, but a couple had it on the right. As a long-time motorcycle rider I am used to having the front brake on the right, but I have never had any braking issues regardless of which side the lever is mounted. My current car is right hand drive, as I live in Japan, but I drove left hand drive cars for many years. In Japan cars can come with the turn signal and wiper controls on either side. On my BMW, the turn signal is on the left side, on my Alphard, it is on the right. Needless to say, I am often unintentionally using the wipers or turn signals.