Did some basic maintenance, but now there's problems...
 

2016 Honda Fit EX, 127K miles

I replaced the front passenger side strut assembly the other day, and when I started the car after I was done, I noticed three main problems:
1.) The front brakes were not engaging, and I could easily spin the front wheel by hand. This should not be able to happen.
2.) There are a lot of lights on in the dashboard, including an ABS, traction control, power steering, and low tire pressure light. Not good.
3.) The steering feels incredibly loose; the car will still steer, but there's way less feedback than usual when doing so.

I have not attempted to actually drive the car yet due to the brakes, and I have little idea as to what could be causing those problems after a routine strut replacement. I tried disconnecting the battery for 30 minutes and coming back later, but the lights and issues are still present. My best guess is that a speed sensor is disconnected somewhere, but I haven't been able to find any problems there. Any help would be very much appreciated! Sincerely, frustrated.

Best to pull the OBD-II codes and start from there. Anything else is a guess.

Shit. All that wrong with a 5-year old car? 127k isn't nothing, but still. Spend the $100 and let a mechanic look at it. If not you're just going to be wondering if it's going to stop and one time it isn't.

It's been a while, but I think there's only one sensor per corner, if you don't want to go the mechanic route I'd replace that first. Might have been damaged somehow during the strut work.

ABS Sensor
 

It's the ABS, which affects braking and also executes traction control commands so you could get the Christmas tree light. The light steering could be loose main bolts on the strut or up top where it goes into the frame. Could be a bad order of parts up there or they didn't put on a new bearing. Take the tire off and do a visual.

maybe with the new strut you need an alignment , too much toe in ? that could make it feel loose .