http://www.boycottford.com/Default.a...&sid=329189314
>
>
>Comboverfish wrote:
>
>> I guess I haven't run across this specific Ford brake switch but it
>> sounds like it measures *brake fluid pressure* -- assuming that the
>> report is accurate. If this is true, why don't they use a momentary NO
>> switch on the brake pedal (mechanically) like everyone else? And I'm
>> not trying to sound smarter than Ford engineers, but seriously, to
>> activate the brake lights, signal the ECM of braking, and/or cut cruise
>> operation -- I would much rather monitor brake pedal motion. It would
>> be fine and dandy to have a pressure transducer AS WELL, for double
>> checking purposes. If a transducer were to fail it would pose a low
>> current, 5 volt threat to the brake fluid only with the key on verses a
>> 12 volt 10-20 amp fused circuit hot at all times. What gives?
>>
>> Toyota MDT in MO
>
>Actually they do monitor the brake pedal postion to turn off
>the cruise control. The switch in the brake line is a
>redundnat safety feature. It opens if the pressure in the
>line is above 125 psi. The switch is used on most Fords, but
>only certain model trucks seem to be fire prone. For some
>reason, in some vehicles, the power feed to the switch is
>live all the time. In other vehicles it is switched. In all
>cases it is fused (7.5 amp fuse in some/most/all cases?). I
>have no idea why they use a live feed in some vehicles. I
>also don't really understand the failure mechanism. It is
>alledged that only a certain batch of switches is bad. Who
>knows. I have already seen one report where someone was
>caught torching his house and trying to blame it on his
>truck. Until the story broke, there were only a few cases in
>the NHTSA database. After the first stories, the number of
>complaints sky rocketed. Supposedly a sure sign of a problem
>is a cruise control that stops working.
>
>Is brake fluid especially flammable? I thought it was not
>easy to ignite. Shouldn't a 7.5 amp fuse be sufficient to
>prevent a fire in the wiring? Seems like a weird one to me.
>I'd hate to have to explain the live feed to the switch.
>
>Regards,
>
>Ed White
////////////
Was someone bypassing the fuse links ? This is very common.




"Fix it now or pay later"