Quote:
Originally Posted by eric8
After playing around with it and pushing the pedal through its range of travel, the big spring appears to be the exact opposite of a return spring. Rather, it feels like it is assisting the pedal to go to the floor once it gets through the first 25% of its travel.
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That's often called an "over center" spring and does exactly as you described. It assists in pushing the pedal down once the pedal travel goes beyond the center pivot point of the spring.
Quote:
Originally Posted by eric8
Maybe it was used on C20s with super heavy duty clutch setups, so the pedal effort wouldn't seem so high? You'd still think they would show the spring in the parts breakdowns or assembly manuals if that were the case though.
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This diagram is from the assembly manual (sorry, scanner clipped off the LH side a bit but I think you can still read most of it). Looks like it was used in medium duty trucks:
