Our cars have a nicely adjustable limiter for the brake pedal return. The red arrow in the photo points to it. It keeps slop out of the brake pedal and optimally positions it for its next use. The gas pedal also has a limiter for both full throttle and no gas. Yet the clutch pedal seems to be on its own. There is no return limiter and thus the clutch pedal has a small amount of slop before engaging with hydraulic pressure. And this is after a full rebuild of the clutch effort reduction system and the clutch master cylinder. It looks like I can fabricate a limiter with a braided wire cable and some fasteners. Has anyone looked into this already?
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Have you tried taking up the slop in the length of the master cylinder push rod in the clevis?
That adjustment only changes the pedal angle and does not change the small amount of slop.
just my rambling thought . . .
Why do you need a spring at the pedal to "lift" it?
If springs were reversed designed, would not that "eleminate" the clearance between pedal linkage and MC piston?
I doubt the spring at that radius would "press" the piston in any.
On hydrualic failure pedal would drift to the floor
Those are good questions that only the Italian engineers know for sure. The springs in the clutch pressure plate are the primary source of return. The counter spring on the pedal shaft intends to return the pedal to your foot in an effort to compensate for slop. But the counter spring on the shaft overcompensates and there is a dead spot when you press on the pedal and hydraulic system starts to engage. A limiter like the one on the brake pedal eliminates the dead spot. It is not clear to me why the brake pedal got a limiter and clutch pedal did not get one.
It is not clear to me why the brake pedal got a limiter and clutch pedal did not get one.
I'd have to go look and reconfirm but from memory don't believe the brake pedal is positively linked to the master cylinder because of the push rod and booster, whereas the clutch push rod is held in the master by a circlip and can only come out so far.
There is a positive link between the brake master and the booster. We put a preload of .015" to .030" in that area to get some firmness in the pedal. Inside the booster is a mystery to me. I don't know if that is a direct link between the booster and the pedal although when the engine is off it has a solid feel.