Manual pedal swap, where to drill?

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erasedhammer

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Yesterday got my entire old pedal assembly out, now I'm looking at the firewall, not sure where to drill the holes for the master cylinder. Supposedly there's an indent for it.
Speedometer cable looks like it might be in the way?

IMG_20200623_100139.jpg
 

Black Ops

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The bolt holes are at an angle. I can see the 3 dimples in the picture in your first post so they must be under that coating.
 

erasedhammer

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Seattle
The bolt holes are at an angle. I can see the 3 dimples in the picture in your first post so they must be under that coating.
They definitely aren't the correct size, I hope they are in the right place.

Does it matter how exact the master cyl is mounted? How much lee-way do I have?
 

erasedhammer

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Seattle
The bolt holes are at an angle. I can see the 3 dimples in the picture in your first post so they must be under that coating.
The hole I think you are seeing in my pic is one that looks to have been used to mount the electrical connector block to the firewall. It lines up with it.
 

erasedhammer

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The master cylinder has to be in the right spot for the rod to line up and the required supports to go in the bolt holes. I’m not talking about the hole through the firewall, all three dimples are above that in your photo. The middle one is barely visable.
Ah I see them now!
I have the supports so I can match a drill bit to that, do you happen to know the size of hole saw needed for the cylinder itself?
 

Black Ops

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It’s too hard to measure on a truck. If you don’t have a master cylinder to measure I can dig one out and look.
 

erasedhammer

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It’s too hard to measure on a truck. If you don’t have a master cylinder to measure I can dig one out and look.
I hope I didn't just destroy my firewall.
Got my hands on a master cyl and the holes do not line up at all. Also the whole thing is at an angle.
Any reason why the dimples don't line up properly?15929338241146461066126289119013.jpg15929338353233446049552007419151.jpg15929338874913347659822491749628.jpg

15929338241146461066126289119013.jpg
15929338353233446049552007419151.jpg
15929338874913347659822491749628.jpg
 
Last edited:

erasedhammer

Member
723
9
18
Location
Seattle
Well, the dimples definitely aren't perfect. I elected to keep the mounting holes in the same place and change the main hole position. Not very clean, but clamped securely.

IMG_20200623_180451.jpg
IMG_20200623_180508.jpg

Now I just have to figure out how to reinstall the steering column...
 
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