It would hurt it. Changing the spring will make the pedal harder to push down. The spring pulls the pedal up.
my vaulxhall corsa's clutch pedal is very high and biteing right at the top
"Riding the Clutch" and a good way to burn it out. Also: a very bad habit
It is at the very top of the clutch pedal. you have to remove the lower cover, the one by your shins. then look all the way at the top of the pedal. It looks different than you are probly used to, it is round and it rotates as you push the pedal.
Yes. There is a switch located behind the clutch pedal to must be depressed (when the clutch pedal is pressed all the way down) in order for the ignition circuit to be completed. Therefore the car will not start if the clutch pedal is not pressed all the way down. Starting a car while it is in gear can be very damaging to the transmission.ADDED: ... not to mention other cars and people around you!
It is probably the vacuum booster. That's what gives you your "power" brakes.
The throwout bearing is bad. This bearing sits in the center of the clutch. Replacing it requires removing the transmission from the car, and it would be a VERY good time to replace both the clutch and the pressure plate while you have it apart.
Improper use of the clutch or improper adjustment will wear the driven plate out very quickly. The clutch pedal free play should be at least 1/2" or 12 mm. Don't rest your foot on the pedal while driving. Both will cause wear.
When you push the clutch pedal in , it is the hydraulic system that operates the clutch slave cylinder that disengages the clutch disc
Check the bulkhead hasn't burst where the pedal box is mounted. Common fault.
If you have hydraulic clutch there is air in the lines and needs bled. If not hydraulic it could be a stretched cable, a bent clutch fork, or they have installed a clutch for a different model.
Generally when a booster goes out, you have to use your full leg to push the brake pedal down. It becomes very stiff.