How to prevent front brake being applied during car travel?

Bought my first MTB a week ago,
First time owning discs.
The dude at the LBS said "don't ever pull [the front brake] when the wheel is out".
Just read on here why - piston popping out and fluid going everywhere. Right.
Is there any way to prevent this during travel with my bike in the boot? I have to take the front out to fit it in.
I don't want the bike to shift during travel or me just plain not notice as I load it, have the front lever applied and fluid pisses everywhere in my car!
Would sticking a credit card in between the pads work?
First time owning discs.
The dude at the LBS said "don't ever pull [the front brake] when the wheel is out".
Just read on here why - piston popping out and fluid going everywhere. Right.
Is there any way to prevent this during travel with my bike in the boot? I have to take the front out to fit it in.
I don't want the bike to shift during travel or me just plain not notice as I load it, have the front lever applied and fluid pisses everywhere in my car!
Would sticking a credit card in between the pads work?
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Posts
Or turn the handle bars so the levers are facing upwards and not able to be pulled
Cube LTD 29er
Glentress Trailfairies
Burls Ti Tourer for Tarmac, Saracen aluminium full suss for trails
interesting. ill look for the one for my brakes!
http://www.pinkbike.com/photo/4459322/
http://cornwallmtb.kk5.org/
Parktools :?:SheldonBrown
Although, i have also used allen keys, dragged a mtb glove into the gap, urm, and lots of other methods.
Specialized P3 Frame
Marzocchi Z2 Atom 80mm
I always carry my bike in the bike of my car, often with friends bikes and I've never ever had any problems, perhaps twice I've had to get a flat screwdriver out the reopen the pads, but it's not the end of the world, don't worry too much about the apocalyptic warnings.
There is no secret ingredient - Kung Fu Panda
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Parktools
I've also used a 500ml plastic coke bottle wedged between the handlebars and the brake lever before.
Take them out before you wash the bike first though as its no fun trying to remove soggy beer mat from between your pads!!