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> Brake Master Cylinder Flex, you'll be surprised
McMark
post Apr 7 2010, 10:33 AM
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https://www.youtube.com/watch?v=CUdPmitJ9XQ


Took this video to post in my "Hold the phone!" build thread, but for those who might miss it, this is a repost.
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ConeDodger
post Apr 7 2010, 10:42 AM
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Holy Moly! Don't we have a member vendor that has a weld in and bolt in brace?
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ChrisFoley
post Apr 7 2010, 10:51 AM
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I think I read that the bolt-in brace is no longer being made.
Some lucky WCR attendee may be receiving one of the weld-in braces though.
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rick 918-S
post Apr 7 2010, 10:57 AM
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Fix your floor pan. It's cracked around the brace. Oh, then add the brace.
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McMark
post Apr 7 2010, 11:07 AM
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Eh? (IMG:style_emoticons/default/blink.gif)

I didn't see no cracking. (IMG:style_emoticons/default/confused24.gif)
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underthetire
post Apr 7 2010, 11:10 AM
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Holly crap ! Think i'll make a support after seeing that.
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Root_Werks
post Apr 7 2010, 11:14 AM
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rick 918-S
post Apr 7 2010, 11:19 AM
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QUOTE(McMark @ Apr 7 2010, 12:07 PM) *

Eh? (IMG:style_emoticons/default/blink.gif)

I didn't see no cracking. (IMG:style_emoticons/default/confused24.gif)


Look around the curve of the brace as the master flexes. The brace is stable and the pan moves. I think I can even see light around it. I could be wrong...
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SirAndy
post Apr 7 2010, 11:20 AM
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QUOTE(McMark @ Apr 7 2010, 09:33 AM) *

you'll be surprised

Nope ... I've seen this many times. They all flex. (IMG:style_emoticons/default/shades.gif)

Back in the old days, people welded a boxed section around the back of the mounting area.
Lots of work and ugly, but effective.

The clamp-on solution worked, but didn't seem 'right'.


I've been thinking about welding a tab on the steel cross-member that would allow you to bolt on a support bracket under the MC.
That way, if you need to replace the MC, you can just unbolt the bracket.
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SirAndy
post Apr 7 2010, 11:22 AM
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QUOTE(rick 918-S @ Apr 7 2010, 10:19 AM) *

Look around the curve of the brace as the master flexes. The brace is stable and the pan moves. I think I can even see light around it. I could be wrong...

The metal flexes, but not because it's cracked. It's just a single layer of sheet-metal that will bend every time you hit the brakes.

All stock 914s do that ...
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ericread
post Apr 7 2010, 11:28 AM
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There was also a bolt-on brace offered previously (I have no welding skills/eqiuipment). I have looked around but I cannot find it for sale anywhere. If anyone wants to make one, I'm first in line to purchase.

Eric
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McMark
post Apr 7 2010, 12:25 PM
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Rick, the factory bracing/box which is under the pedal assembly is open on the forward face. That crack you're seeing is just how it is.

Attached Image

This is the 'repair' that I've seen done by another 914 guy. Weld a nut to the cross member and thread a bolt against the MC to brace it. It helps, but not as much as I would like. Time to try something else.


https://www.youtube.com/watch?v=d02D8jRn7T0
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McMark
post Apr 7 2010, 03:01 PM
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Well, here's what it took to get it immobile. A sturdy brace in the vertical direction via a bar that bolts to the MC mount studs at one end and to a welded nut on the cross member. But this brace still moved forward and back, so I had to bring my original 'fix' back into contact with the MC to restrict horizontal movement. The other modifications I tried, still allowed some movement at the MC and didn't feel much more firm at the pedal. After getting this all done, the difference would pronounced at the pedal.

This is all rather ugly, so now I'll go back and replace everything with a cleaner, prettier setup.


https://www.youtube.com/watch?v=iIvAyozXx4Y
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rick 918-S
post Apr 7 2010, 03:09 PM
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Ya, I know the brace is open. I was looking at the stamped edge. Must be the lighting. Glad it's not cracked. Your brace is working well.
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McMark
post Apr 7 2010, 03:11 PM
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There is one of those U-slits under the pedal cluster. You know, the ones that are all over the floor pan. So there is light coming through there, but it's not rust or cracking. It's just factory holes. (IMG:style_emoticons/default/wacko.gif)


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Root_Werks
post Apr 7 2010, 03:16 PM
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That's a good fix!

When mine's up in the air, I'll do something similar for sure.

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rick 918-S
post Apr 7 2010, 04:15 PM
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QUOTE(McMark @ Apr 7 2010, 04:11 PM) *

There is one of those U-slits under the pedal cluster. You know, the ones that are all over the floor pan. So there is light coming through there, but it's not rust or cracking. It's just factory holes. (IMG:style_emoticons/default/wacko.gif)



OH! I knew I saw light! That's right! Anywho... Nice brace!
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veltror
post Apr 7 2010, 04:15 PM
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My floor is rotten so Marek is making up a triple skinned piece as in my thread...
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brant
post Apr 7 2010, 07:15 PM
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fixing the flex is a good thing
it will help firm up the "feel"

we did this on our old car about 15 years ago
and on the new one when we built it 6 years ago also

here is the new ones method with lightening holes:


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brant
post Apr 7 2010, 07:16 PM
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and:


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