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Agree with all the above maintenance suggestions. You might want to get softer pads for the front also. I have had my rear wheel lock up in an emergency situation. That's about all the bike can do when all the weight shifts, you don't want the front wheel to lock up, and you don't want to slam into the bozo in front of you who caused the situation.
Do a maintenance cycle on your brakes, front and rear.
Then, when using brakes, 80% of your stopping power comes from your front brakes. Rear brakes used only in slow speed maneuvering and in hard braking situations. I've been riding 50+ years and still practice emergency braking in empty parking lots or deserted roads.
I have a 2019 Superlow, 120km on the ODO... Mine just did this on the rear brake as I was coming down the hill from my house. It is about 400meters of road, that drop about 150 feet vertically so I roll down clutch in, first gear set, and I also typically use 90% front brake except for today... Big rain yesterday and some slick mud in a few small areas still, so I was riding the rear brake to maintain control of the speed. This bike has the ABS system and it appeared to give a fairly loud "clack clack" and then give me back the brakes. I grabbed a handfull of front brake and brought it to a total stop with only about 10 to 15 feet of elevation left to go, and about 50 to 75 meters of road left to navigate.
My first bike with ABS, and it rather quickly made me suspicious of this new system. It didn't try to throw me, but I am not sure what to think about this as I ride it more and more. I do not have a choice on this hill thing. I live at the top of this road I built. The road is hand made concrete and in pretty good condition. Where it started clacking and acting up was still on the concrete section, before I got to the rocky road part that makes up the last 75 meters before I get to the main concrete road here where I live.
Is this just how ABS works on 2 wheel vehicles? I am used to this ABS thing in cars and trucks, but this really got my attention. The bike is about 10 days old for me...
I have another bike that has ABS and that clacking is normal. Feels almost like its not slowing you down. But it is.
Harley's implementation of ABS is fairly brutal compared to automotive ABS. It makes a lot of loud clacking as it engages and disengages. Some of that may be because there is nothing between you and the brakes like there is in a car.
My 2006 does not have ABS and normally I can stomp on the rear brake pretty hard and it doesn't lock. But in an emergency braking when a lot of weight is transferred to the front of the bike the rear wheel locks easier.
Like DK Customs said, you have to practice emergency braking and learn how to moderate the locking of the rear wheel.
I would lift the bike and spin the back wheel to see if the brake is binding. If your wheel is not aligned it could cause this also. (Don't ask how I know).
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