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Peter, the wife can do it & she's very petite, four clicks is enough.
Just to show you here's a photo taken today in the Isle of Wight on the way to the ferry
20160730_112421.jpg
Just to point out that's a very steep hill & the wife & boys are in the car all so if you look very close between the car & van you can see the vans handbrake isn't on, when towing a caravan around the Isle of Wight you need a good handbrake .
But to be fair you need a good handbrake to tow full stop .
2002 110 HDi estate, Rapier in monaco blue! ( found quite a bit more power ) SOLD I've sorted the airbag light
1998 3.0 V6 SE coupe in Diablo Red ( my baby ) sold
2006 206 1.4 16v sport in Aegean blue ( wife's shopping trolley )
Its in gear In my experience yours is exceptional, I have been involved with a number of 406s including three of my own and only one had what I would call an acceptable handbrake, my first one was practically useless even after I replaced the disc/drum, linings and pads and all three cables and adjusted it according to the book. What ever you have there I would bottle and sell it
Yep, that's what I've found, if I adjust it up just before I take it for MOT it usually passes - except the time when he broke the long cable trying to get a high enough reading.