ORIGINAL: Access
It's not supposed to lock the tires. There is real braking happening if everything is working right, compare this.
1) Go to full speed, then take your finger off the trigger and let it go into nuetral.
2) Go to full speed, then push the trigger all the way forward (full brake).
Did you try this yet? What was the result?
Some ESCs have weaker braking than others. I have had a couple that didn't stop very fast.