brake and/or cluctch pedal switch(es)

[4saabstoomany]

i know in many saab t's the brake pedal switch is a little off, and that is what often causes the apc valve to chatter when the car is running. do any of you guys think it would be bad to just complete that circut (the two wires that go into it) permanatly with some wire, or somehow? so you wouldn't have that problem. i don't think this should hurt your turbo, unless your bypass/BOV isn't working properly........right

any thoughts would be awEsome!

thanks.. and always...
pOeace!

[john-w]

I cut the wire from the brakelight at the APC multiplug. I used the little connector to get a connection to an LED knock detection warning light!!

[4saabstoomany]

great idea john! but umm.. where is the multi plug??


and one more thing... what does a knock like have to do with the brake pedal switch?

[john-w]

It's the plug on the APC box, don't recall which pin is from the brakelight switch, but easy to trace with a meter if you get someone to press the brake while you check!
The knock detection light gives you a visable warning inside the cab, handy if your running higher levels of boost!!

[Widde]

I've updated my site with that info(knock led), look under tech -> APC theory

Pictures are on the way...
/Widde

[4saabstoomany]

if i don't have a multi meter and i just want to rig it at the switch it self. would i want to complete that curcut or would i want to just unplug it???

thanks
pOeace!

[MEL]

Originally Posted by 4saabstoomany

i know in many saab t's the brake pedal switch is a little off, and that is what often causes the apc valve to chatter when the car is running.

imho the chattering is nothing to do with the brake switch.
the brake switch disables the apc and so stops solinoid chatterng.
the chattering will probably be caused by something elselike the knock sensor or the pressure transducer

mel

[4saabstoomany]

oh wow.. i didn't know that.. i thought it was the brake switch only becuase when i tamper with it it will stop.. but the switch it striped where it screws in and wo when i push it down to the right pos.. it would stop... and well.. thus thinking that..

thanks!

pOeace!

[4saabstoomany]

so if it is the pressure transducer, how would i fix it.. replace it?