There are 2 relevant adjustment points, (1) the pedal height bolt (pedal stopper bolt) used to adjust pedal height from the floor, and (2) at the pushrod itself. I measured my pedal height. The spec is 6.2 to 6.6 inches, with the carpet pulled back. Mine was 6.75 inches, measured from pedal top to floor, with the carpet and underlayment pulled back. So I would be adjusting the pedal height first, before working on the pushrod. I am concerned however that if I adjust the pedal height bolt, the button for the cruise control clutch switch assembly might not get pushed in far enough, when the pedal is released, to open (or is it close, I'll have to check the manual) the switch. Apparently the switch position is not adjustable! It would be nice if I could just assume that if the pedal height is adjusted properly, the switch button will go all the way in with the pedal up, but it is clear that if I lower the pedal height, by making the stopper bolt longer, the switch button will extend further.
Problem is, there is very little room to work, on either adjustment point. I can't believe how crowded things are. I miss my 1968 VW beetle.
The corolla manual says to first remove the "upper instrument panel assembly," and then to remove the "main body ECU." That should make it easier to get to the adjustment points. Looks like a 12,13, or 14 mm hex on the pedal height bolt and lock nut. I checked the lock nut for the pushrod, 12mm. While loosening this lock nut, I think it may be necessary to hold the flats on the clevis, with a 14 mm wrench, to prevent the clevis from turning, and breaking, where it attaches to the pedal with the hole pin.
I can attach pages from the *.pdf manual if necessary.
I have no idea how to remove the instrument panel parts. It looks different in the corolla manual, from what I have in my matrix, and I don't have a 2010 matrix manual. It looks like it would R&R might take a long time too, be rather complicated, and I'm afraid to let my dealer do anything this complicated, something that really should be easy. I wish this was a simply thing of being able to reach the lock nuts and bolt or locknut and pushrod, without having to remove the whole globblam dash, with all those fragile plastic clips. Removing the carpet to check the pedal height was hard enough! I was worried I'd break the plastic trim panels that have to be removed before can remove the carpet.
I suppose a dirty trick I could use would be to glue a shim to the top of the clutch pedal cushion that the clutch pedal stopper bolt rests against, when the cluch is all the way up. Slip it into place. This might be easier than trying to get wrenches in where they have to go, and turn them, in the very limited space that is available, if the dash is not removed.
Edited by nomenclator, 22 March 2012 - 01:36 PM.