Quote:
Originally Posted by Ultramaroon
The assist spring is a compression spring that is part of an overcenter mechanism. Think of any old toggle switch. When you flip the switch slowly it first resists the motion. At some point, when the spring is at maximum compression the mechanism rolls "over center" and then the spring forces the switch the opposite direction.
At factory height adjustment, the clutch assist spring is ever so slightly over center so it pushes the clutch pedal away from the floor.
When the clutch pedal is depressed, very early in the arc, the mode changes so the spring, as it decompresses, applies force in the direction of pressing the clutch pedal. It pushes the same direction as your foot.
This is why some people who have aggressively lowered their clutch pedals without removing the spring report having to sometimes pull back on the pedal to raise it completely. The device never gets to that neutral point where it no longer applies downward force on the pedal.
I believe this may also be the cause of some of these premature throwout bearing failures but have no hard evidence to support the theory.
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I actually decided I was going to try to reset this back to stock. I've done my best but I've been driving with a slightly lowered clutch pedal for about a year, so I've forgotten. during a different service, I asked the dealership to see if they could "Check the clutch height for me".
My paperwork came back with the folowing note: "There is no clutch adjustment for this vehicle. While slightly lower than other FRS on the lot, there appears to be nothing out of alignment or harmful with the vehicle."
--- I guess, to me, that means if it WAS aggressively low, it could be damaging to the vehicle, in theory. Or the toyota mechanic was a complete idiot. But you know... which ever