Yes you can get tire howl or screeching whenever your tire rotational speed doesn't match ground speed - works under not only braking conditions but rolling throttle too hard in a corner or if you don't match engine speed while aggressively down shifting.
Nothing to worry about. In fact it's a good indicator of what you said, modulating lever pressure before lockup. It sounds like you did it right.
Practicing emergency maneuvers in a parking lot is a must in my opinion. If you haven't already try giving Keith Codes Twist of the Wrist series a look and Ride Like a Pro by Jerry Palladino. It's fun developing the skills to handle a 650+ lbs cruiser at low and high speeds that only a few on even a sports bike will achieve because they don't put in the proper training.
2007 VStar 1100 Classic
Mods: SS Custom Cycle 429 cams, Barnett 64lb clutch spring conversion, Roadhouse 2-into-1 exhaust, Dyna 3000 ignition module, Dyna Hi-energy coils, Thundervolt spark plug wires, Metric Magic Under tank K&N filter pods, Metric Magic PMS screws, relocated "choke" off bar to engine, Yamaha upgraded starter clutch, Clevver clutch lever, rejetted carbs, Barons ORK oil filter relocation kit, Mustang touring seat, 1000lbs Eibach rear suspension spring, Progressive front fork springs, Stebel Nautilus horn, upgraded rear turn signals, Saddleman Midnight express saddlebags, Givi E340 topcase, VStar tall windshield and yes, 16-inch apes with internal wiring.
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