I found this video on YouTube that was very helpful:.
I might try setting up the rear brake without the linkwire if I can find the part I'd need in my parts drawer. I've got the front brake adjusted about right, but the rear is still too weak. I figure I don't want my son going over the handlebars, but I understand the front brake has the ability to slow you more than the rear.
I assume I should be able to skid the rear tire on hard pavement when it's set properly?