I's just an old spring i found by a friend who repairs cars. Just make sure it's stiffer than the original one ! And yes, you can do it for the other pedals, they're basically all the same. I didn't touch the gas pedal as i'm very satisfied with it, but i have to find something to improve the clutch and make it more natural...
Btw it's a very easy mod, just follow this guide to open the pedal set
awesome thanks my friend. In your pic is the black thing inside the spring you installed? if so looks like a valve spring. If that's correct I wonder which model of car it came from. lol.
Ha you spotted that too Well it's a weird piece of steel i found while looking for a washer. Here's all the crap i managed to fit into the pedal :
When you'll open the pedal case, you'll notice that it's all made of plastic, so i put this washer to prevent the second spring from ruining this part :