Met him when I worked for Commercial Engineers,the first FIAT agents in Stoke,(My job prior to starting my m/e career).
This would be in 1973/4.
I was called out to a breakdown,a Mr.Derick Minter was the o/d with a new FIAT and was having trouble with his brakes coming on,he was at Stone railway station yard.
When I found him,he was a bit apologetic as while he had been waiting for me with his engine running,his brakes had freed off.
It turned out that he had been doing a lot of shunting turning round in a confined space and had pumped his brakes that much the air pressure had dropped enough to bring his brakes on.I think he was new to the game at the time,however,a thoroughly nice chap.