CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

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sdb8100
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CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

Hello,

I'm re-installing all my interior parts. I was NOT the one who disassembled the interior, so I have no personal references to look back on.

Here are my questions:

- What is the correct return spring mounting location [at the pedal and other] for brake & clutch pedal?
- My clutch pedal sits noticeably higher than the brake pedal and I have adjusted the clutch pedal to the max point. The only way I can see to adjust it lower would be if I cut the adjustment shaft shorter [height from spec for reference: clutch 157mm, brake 167mm]


I can post picture if that helps.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Habitat.pat »

I have a 67.5 so it may be different. There are 2 holes with inserts in the bottom of the dash that the springs go into.

Since someone else too the car apart, it may be that someone replaced the operating shaft with something longer in the past. I replaced both my masters with aftermarket units so I am no help there either, except that I still have my old ones for measurements.

Also, there are shims that go between the firewall & masters for alignment & spacing

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Pat
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sdb8100
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

My clutch master is new from one of our vendors [I can't remember which one].
Are you saying Datsun factory had shims for firewall to master cyl. spacing OR just that shims are a solution in general?

The 2 holes for the springs...I'd love some pictures.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Gregs672000 »

As I recall, many of the clutch masters I have bought (from say, Rock auto) have had a longer push rod that would not adjust low enough vs the original Roadster, so I have swapped them out (easily done IF you have one!). I will take a look at mine and my replacement master I have for the future and repost when I get a chance. Perhaps an option would be to purchase the correct size and pitch dye and add more threads to the rod, then cut it shorter if there are fitment issues... I need to look.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Bwk2000 »

Pic of where the clutch pedal spring attaches under the dash:
442585A8-17F4-40D2-9E36-2760BE578B84.jpeg

Pic of where the brake pedal spring attaches under the dash (just left of the steering column):
A1642C77-F2E5-4FF6-A6C2-6C638DD0BFB1.jpeg



Post a pic of your current clutch pedal alignment.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

This is great! Thanks. I will check for those holes and also take pictures of my current alignment of pedals.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

Here are images of the pedals and also the adjuster bolt of the clutch bottomed out against the pedal preventing any more adjustment.

BRAKE:
BRAKE-MEASURE.jpg
CLUTCH:
CLUTCH-MEASURE.jpg
ADJUSTER [CLUTCH]:
bottomed out.jpg
IMG_0667.JPG
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Gregs672000 »

Yep, you will need to cut that rod. Mine is 2.25 inches from the top of the rubber cap on the master, or 3.25 inches from the fire wall.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

Thanks for the dimension reference. That’s really helpful
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Bwk2000 »

Keep in mind that a typical manual clutch pedal pivot ratio is about 7:1
Cutting off a small amount of the rod will have a much bigger effect on pedal travel. Measure your specific pivot ratio and the current clutch pedal height over stock (or whatever height you want it to be). That will tell you about how much needs to be cut off - Alternately, the ‘little at a time’ method also works … it won’t be much.

* Remember to leave the nut on before you start cutting 😉
Kai
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Classic Cars - Because clean fingernails, free weekends, intact knuckles and financial stability are totally overrated.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

Cutting a little at a time for sure!
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Gregs672000 »

The issue really is that the rod is simply too long to allow him to adjust the pedal height without interference. The throw should be the same, and he has plenty of thread to adjust the pedal to where it should be.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Bwk2000 »

You’re right Greg. As long as he doesn’t leave himself short of thread after the trim he will be fine. For me, I would just try and keep as much of the threaded rod as possible intact.
Kai
Halifax, N.S.
‘69 SPL311 Sports 1600

Classic Cars - Because clean fingernails, free weekends, intact knuckles and financial stability are totally overrated.
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sdb8100
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by sdb8100 »

Yes, doing the math on the pivot ratio is based on pedal length and [pivot to center of pad] vs. location of clutch master pivot in relation to the pivot. The length of the threaded rod would not impact that. However, I want to leave as much length of the rod as possible to ensure the most adjustment before it bottoms out.

I found my old clutch master that was installed in the same vehicle with the same pedal and measured the rod length to the rubber boot. 59.5mm [2.34"]. Much shorter than the replacement.
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Re: CLUTCH & BRAKE PEDAL INSTALL/ADJUST HELP

Post by Gregs672000 »

Just swap them out if the stock ones good, problem solved, no cutting required!
Greg Burrows
'67 2000 #588
Tacoma, WA