the probable best solution would be say on a cossie to fit a tracker with command options then set up one of the options to isolate the power to the brake booster pump

The cunts would stack it hard when the accumulator runs out of pressure and only a detailed forensic investigation would discover such a fault with the electrical supply.

You would of course need to resend a command to the unit once you know its crashed to restore the power to the brakes. Then factory restore youre phone.

Again it would need a detailed forensic investigation to discover the tracking device and to realise what had happened. The police would need to suspect a brake failure first. initial testing of the brakes would show the system operational, so unless they suspected foul play (why would they) then they would be unlikely to look further than checking the brakes work.

however if they suspect foul play you are screwed as they would eventually discover the electronics and the tracker and recover the cellphone records showing you sent the command texts to kill the brakes. But that is unlikely.

A more sensible option is to rig up the command options to cut the fuel pump and/or the ignition relays/circuits feeding the cossie loom.

no engine, no go.