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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

Clutch/Brake Pedal Height

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Old Jan 2, 2022 | 12:42 PM
  #1  
Neemox's Avatar
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Clutch/Brake Pedal Height

So I need some other reference point to measure the clutch/brake pedal freeplay. I recently had to weld in a new chunk of floor under the driver's side. I had to take the whole dash out, including pedals and even if I hadn't, the floor isn't in the same spot anymore. I put sound dampening mats in, but I'm sure they aren't the same size as the stock asphalt anyway. Long story short, I don't have any confidence that the floor is where it should be. Learning a lot while I go, before you weld your floors. measure from the roof or something, hah.

Can anyone think of another way to measure the freeplay and pedal height that will get my clutch and brakes to safe/efficient operation? (Clutch is "adjusted" according to FSM right now, but I get a squeel on release and a whining like a half engaged bearing...)

TIA
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Old Jan 2, 2022 | 03:45 PM
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I have the engine out doing other work, and just got the throw out bearing re-installed. It definitely looks like it is sticking out too far on the slide. Makes me think there is pressure coming from the clutch pedal? The release cylinder is definitely sticking out further than I recall too, but maybe my memory is off...

There is also a tiny kink in the clutch release cylinder hard link (right at the flare nut) but I don't think that's the cause of the problem...

Will incorrect pedal height/free play on the clutch pedal cause this?

Sticking too far out

release cylinder over extended?

potential kink in line
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Old Jan 2, 2022 | 05:12 PM
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Actual pedal height is irrelevant,

What is essential is that both the clutch master and brake master actuating rods retract enough for their respective pistons to come completely back on their outer stops.

Only when those master pistons are completely rearward with slight freeplay at the actuating rod and master piston interface, can any residual hydraulic pressure be relieved.

Last edited by millball; Jan 2, 2022 at 06:12 PM.
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Old Jan 2, 2022 | 07:23 PM
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Thanks Millball, exactly what I needed to hear.

I shouldn't worry about the return spring in the release cylinder on the clutch "pushing" back too hard on the pressure plate fingers?
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Old Jan 2, 2022 | 07:41 PM
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Should be no issue so long as the clutch master piston is full back so that the master cylinders relief port is clear..
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