brake wear sensor difference front and back?
 

What is the different between the Front and Rear brake wear sensors. They sell front and back. Is it the length?

Where is the switch to open my convertible top? :)

hidden just above your key. toggles forward and backward, not the side to side toggle.

Thanks. And follow up silly question - if I toggle that switch AND the pressure plates that control the latching motors, will I be able to see if those suckers still work? My issue is that my top is down and broken and I'm replacing with a hard top, but I want to know what I can salvage from the soft top...and currently just using the pressure plate/switch on the convertible top to test the latching motor without actuating the convertible top closing switch isn't helping...

do all years require a distributor vent kit? also, there's what seems to be an air nipple behind the centre light reflector, what is that for?

Yes, a distributor vent is recommended for all 964s. The air nipple for the center reflector is to keep moisture out. Both your distributor and center reflector should be connected to the air pipe connected to the heater blower.

Cool thanks. What would I connect them to if I've removed my blower motor and blocked off the heater pipe?

I've seen this solution from Rennlist. (No affiliations)

http://www.rennline.com/images/M05.07-2.jpg

You use a plate like the one on the right in the pic below and make a bigger hole it it to use the factory tube and grommet. I cant find a pic of one installed though.

http://www.myricambi.com/upload_news...1389887787.jpg

Dont buy one - just make it :)

*edit Rocket Rob lived up to his name and beat me to it :)

Ok perfect question for this thread ...

Valve adjustment must be done:
1. With engine warm
2. Or cold

Please be gentle ... ;) Thanks

cold.

Engine cold.

Ok great .. So I guess the gap when cold is calibrated for the typical running temp ...super

On the C4, there is a pump that runs when the ignition is turned to position2. Sounds like it builds up pressure, then shuts off. Seems to take different lengths of time to build then stop. This is the ABS pump correct? How long should it run to charge up? If it takes 20 seconds, is that an indication of a problem?

Another one...
There appears to be three horns in the RHS wheel well. The two low/high horns for the steering wheel horn, and another round one, further forward. What is the third one?
I have recently removed the scattered remains of an after market radar detector system and an after market audiovox security system. But the third horn looks OEM an,d not part of this wiring nightmare.