"Trent©" wrote in message:
Does HD have a brake on their lumber carts yet? Do other Lowe's
locations have that brake?



The HD's in my area have had them for years or to be more precise, had them
years ago.
Any and all brake hardware on the carts has pretty much been nullified or
destroyed.
If you go to a new store(Lowe's or HD) you should see some working carts.

As Leon said, people push them with the brakes on. It can be slightly
entertaining to watch "brute force versus brakes".
I actually saw a couple pushing one across a parking lot like this. Strong
and determined, they were.