Sabotaging 1938 Mercedes Benz 770 - Technical Advice?

[honeymonster]

I am a novelist currently working on a book set during the Second World War.

A part of the plot of my novel involves the Dutch resistance sabotaging the Mercedes 770 of a German SS officer in order to cause an accident. In order to make this realistic I am trying to ascertain how this might be done.

It must be a way that would allow the car to drive normally for a short period of time before the problem showed itself.

Any technical advice would be welcomed.

[maxwedge]

Cut one of the brake lines causing a slow leak, no brakes dwn the road, Or sugar in the gas tank.