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> Brake Master Cylinder Flex, you'll be surprised
ChrisFoley
post Apr 7 2010, 07:35 PM
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McMark
post Apr 7 2010, 08:29 PM
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Chris, how do you change the MC?
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ChrisFoley
post Apr 7 2010, 08:50 PM
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ChrisFoley
post Apr 7 2010, 08:51 PM
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Actually, the pictures are of a prototype.
We added a little lip on the angle iron piece that prevents the MC from moving downwards under braking pressure.
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PRS914-6
post Apr 7 2010, 09:02 PM
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Here is my installation with a hydraulic clutch. It is quite simple to add some reinforcing with some scrap metal. It is attached to the suspension beam. Note the plate under both cylinders that is flanged.

Attached Image
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McMark
post Apr 7 2010, 09:15 PM
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AHA! Chris, you were hiding the details from me! (IMG:style_emoticons/default/tongue.gif)

That's much better than what I did. (IMG:style_emoticons/default/idea.gif) I'll have to order one and swap in another cross beam.

QUOTE
We added a little lip on the angle iron piece that prevents the MC from moving downwards under braking pressure.

I was wondering about that, but didn't want to offend. (IMG:style_emoticons/default/cool.gif)
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realred914
post Apr 7 2010, 09:22 PM
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QUOTE(SirAndy @ Apr 7 2010, 10:20 AM) *

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.
(IMG:style_emoticons/default/popcorn[1].gif) Andy



andy whats the clamp on solution look like, no welding needed at all would be nice!
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Eric_Shea
post Apr 8 2010, 08:50 PM
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Mr. Burton and I have them on our cars. Chris makes the best set-up (as usual):

(IMG:http://www.914world.com/bbs2/uploads/post-1110-1235261267.jpg)
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914werke
post Apr 9 2010, 01:22 AM
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Chris do you have a similar solution for those running an aluminum x-member?
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ChrisFoley
post Apr 9 2010, 05:29 AM
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QUOTE(rdauenhauer @ Apr 9 2010, 03:22 AM) *

Chris do you have a similar solution for those running an aluminum x-member?

I looked at it briefly but didn't come up with a good solution.
I don't consider the aluminum crossmember to be an upgrade so I doubt I'll ever install one.
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pcar916
post Apr 9 2010, 06:10 AM
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Obviously for those with big-brakes only, the Mercedes 23mm cylinder butts up the the stock crossmember.

It was slightly long, but all I had to do was grind off a bit from the end of the MC and add a thin, stiff plastic sheath around the cross-member and it was done. This is better, no movement at all. I've never looked at it's flex directly but it's GOT to be moving a little. Time for an inspection.

I'll climb under the car sooner than expected and check for wear.
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0396
post Apr 9 2010, 08:17 AM
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QUOTE(pcar916 @ Apr 9 2010, 04:10 AM) *

Obviously for those with big-brakes only, the Mercedes 23mm cylinder butts up the the stock crossmember.

It was slightly long, but all I had to do was grind off a bit from the end of the MC and add a thin, stiff plastic sheath around the cross-member and it was done. This is better, no movement at all. I've never looked at it's flex directly but it's GOT to be moving a little. Time for an inspection.

I'll climb under the car sooner than expected and check for wear.



Can you please post a picture so we can 'see' exactly what your referring too?

Thank you!
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realred914
post Apr 9 2010, 10:43 AM
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QUOTE(Eric_Shea @ Apr 8 2010, 07:50 PM) *

Mr. Burton and I have them on our cars. Chris makes the best set-up (as usual):

(IMG:http://www.914world.com/bbs2/uploads/post-1110-1235261267.jpg)



is the stud supposed to be crooked? looks that way in the photo?

anyone know whats up with the clamp on support andy mentioned? whats that like?


also how much foor pressure was required to get teh movement seem in the movie? was it a full force thing with you leg or a lesser force?

I guess if I was racing , the car would get a lot of full force breaking stops, but on regular street use, full force braking is not frequent.

does this failure happen often on street cazrs, or is this mainly a track/race car issue?
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SirAndy
post Apr 9 2010, 10:47 AM
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QUOTE(realred914 @ Apr 9 2010, 09:43 AM) *

does this failure happen often on street cazrs, or is this mainly a track/race car issue?

It's not a failure. All stock 914s do that.

As for the clamp on solution, it's been a while since i've seen the posts (several years?) but they are here somewhere.

Basically, it's a metal brace that is clamped to the cross-member and MC holding the MC in place.
(IMG:style_emoticons/default/shades.gif) Andy
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ConeDodger
post Apr 9 2010, 10:50 AM
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The clamp on and weld on solution was made by one of our Member Vendors. You can cruise that forum and find it. This is what was used on the Grassroots Motorsports 914 Project car. I suspect that the member vendor no longer makes this since he has not spoken up.

Some level of this is happening all the time with every brake effort.
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realred914
post Apr 9 2010, 10:52 AM
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QUOTE(ConeDodger @ Apr 9 2010, 09:50 AM) *

The clamp on and weld on solution was made by one of our Member Vendors. You can cruise that forum and find it. This is what was used on the Grassroots Motorsports 914 Project car. I suspect that the member vendor no longer makes this since he has not spoken up.

Some level of this is happening all the time with every brake effort.

thanks, I cuse I need to get mine and my friends cars checked on teh flex and any cracks.

a clamp on soulution would be nice, I got to take a look into that!
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pcar916
post Apr 9 2010, 12:19 PM
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QUOTE(396 @ Apr 9 2010, 06:17 AM) *

QUOTE(pcar916 @ Apr 9 2010, 04:10 AM) *

I'll climb under the car sooner than expected and check for wear.


Can you please post a picture so we can 'see' exactly what your referring too?

Thank you!


Glad to. It'll be a couple of days but I'll post it when I get it!! (IMG:style_emoticons/default/beer.gif)
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Eric_Shea
post Apr 9 2010, 12:33 PM
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QUOTE
is the stud supposed to be crooked? looks that way in the photo?


Yes.
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d914
post Apr 9 2010, 01:26 PM
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I have a clamp version I will not be using.. I have to put another master in for the clutch so we'll weld something up or get chris's set up..
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TravisNeff
post Apr 9 2010, 02:22 PM
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I used to make the clamp in units a while back.
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