Brake Lock Then Car Wouldn't Start.

[Dominic_Star]

Today as I was leaving the work car park, I reversed slowly out on full lock immediately from stationery after starting the engine. I braked and stopped the car and all was good. Put it in first gear, went to move as usual and the car moved about a metre at most, stuttered twice then stalled. However, when I attempted to restart the car, clutch down, pressing on the brake and in neutral, the brake would not depress whatsoever and the engine would not start. I tried this 3 or 4 times and tried pumping gently on the brake to see if there was any give, but it was locked tight. As I was in the middle of the car park I tried to let it roll in to a bay by taking the hand brake off, but the steering was locked and the brake still frozen so I had to give up on that and put the hand brake back on. Eventually after sitting for about 1 minute, I tried again and the car started fine. I did a couple of hard braking manoeuvres at about 15 mph in the car park and the car stopped instantly, so the brakes seemed fine and performed perfectly all the way home.

Is this something I should be worried about or something that just happens occasionally and is normal? It has happened once before but that was on a slightly below freezing day in December and on that occasion it was as soon as the car was first started so assumed it was because of the temperature. Whereas today it was 7c at the time and the car was running when the brake locked.

Info about the car:

It's a Yaris TR 1.33 2013 model and is slightly over 2 years old. It was serviced on 29 January and the brakes got a green on the service report. I've driven about 21k miles and it's mostly motorway driving (80%+), so not huge amounts of braking and I am a pretty smooth when braking.

Usually when I full lock reverse to the right I get those little clunking sounds I have read about (something to do with the way the suspension sits in rubber parts I think I read).