23mm MC: Who's Done it?

[Eric_Shea]

Is all that is needed the longer rod?

What about line inputs? One appears to be back so far that it would interfere with the body.

What's the purpose of the longer shaft extending into the pedal assembly?

[gms]

I believe there is one on the new car, I will try to get some pix to show the fit

[Eric_Shea]

Thanks Glenn.

[dug]

www.smartracingproducts.com has all the pieces required listed on page 69 of their catalog. The kit is $212 and just the MC is $166. The small parts listed only add up to $35.34, so I'm not sure why the kit is more than the combined total.

Aside from the push rod, there is a plug, a 90 degree elbow and a hose, perhaps those parts are the ones that help it to fit.

dug

[Eric_Shea]

Awesome find Mr. Dug.

That's what I needed. The 10x1 plug and washer is what I use in the calipers. Looks like I'll need the 90 and the plunger and the hose.

[dug]

I was seriously looking right at that catalog when I saw your post. So weird. I was stoked when I saw that. I've had a 23mm new in the box on my shelf for a few years now, but I didn't know what else I would need. The info on the longer rod is meager at best. I figured it must not be that hard, but I hadn't gotten around to actually trying anything yet either.

cheers,
dug

[Eric_Shea]

I have a friend who has a Mercedes bone-yard of sorts. I'd bet those are a dime-a-dozen but, for $15 clams I just ordered one from Smart and let them ship it to my front door. They shipped that, the angled piece and 13" of blue hose last Thursday. I should see it tomorrow.

I can get those MC's for $150 if anyone else wants one.

[gms]

Eric,
can't wait to see the kit!

[Eric_Shea]

Here ya go Glenn,

Goodies came in today. I got everything I needed for $30.00 shipped.

My only concern is the CFR master cylinder brace I have on the car now... it "may" have to go.

New Benz rod compared to the 914 rod. Plastic 90 degree elbow and the 10x1 (5mm allen) plug.

[gms]

looks like a nice simple retro fit, what does the bracket look like?

[Eric_Shea]

brace...

http://www.tangerineracing.com/images/Brakes/MCBrace%2001.jpg

and...

http://www.tangerineracing.com/images/Brakes/MCBrace%2002.jpg

[Eric_Shea]

Haven't got a clue as to why that first image tag isn't working... :confused:

[jim dorociak]

Guys, I just ran across a 23 mm master cylinder for 911 and 914s that is the same physical size as the 19 mm and will require nothing special to bolt in and use. I bought a couple extra if anyone is interested. $130 each jim
jdorociak@gmail.com

[davep]

Photos ?
One of these days I'll have to rebuild one of my two 20 mm masters.

[jim dorociak]

Sorry for not posting a picture. Jim

[Eric_Shea]

Do you have a part number so I can compare it to the one I have?

[jim dorociak]

911.355.012.02A Porsche Master Cylinder big bore specifically designed for the 911 up to 1977 and the early 914's. I spoke with the company that manufactured it and it was designed as a bolt in replacement for the 19 mm to push more volume of fluid required for either high performance brakes, or larger calipers needing more. Jim

[Eric_Shea]

Is it Chinese?

[jim dorociak]

I am not sure which country it is being manufactured in, it could be. I spoke with the manufactuer. This not sold retail and these are actually being sold into Germany now at a rate of 15 per month. Jim
Eric, have you seen this particular master cylinder?

[Eric_Shea]

I spoke with the manufactuer

Did they speak Chinese? :D

have you seen this particular master cylinder?

I haven't...

I spoke to Pelican and they said they had a fairly large failure rate on the Chinese MC's so I was holding off on selling them. They stopped selling them from my understanding.

That looks like a nice solution for anyone who has the need.

[JKH]

All the info,

Porsche 911 Big Bore 23MM 68 - 77 Brake Master Cylinder
91135591202A - Fast Shipping! 1 Year Warranty!

Quantity:
More than 10 availablePlease enter a quantity of $quantity$ or less
Please enter a quantity of 1

Price: US $149.00
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FCP Groton, LLC | Toll Free 1-877-634-0063


Porsche 911 Big Bore Brake Master Cylinder 91135501202A
Sellercore
New Porsche BIG BORE (23MM) Brake Master Cylinder 91135501202A



Brand New Porsche Big Bore Brake Master Cylinder (23MM High Perforkmance Version) includes Pressure Switches



WHY BIG BORE?
Because the Big Bore is a 23MM version of the standard Brake Master Cylinder.
Most Porsche Brake Master Cylinders are stocked with 17 or 19MM Bore.
A larger Bore equates to greater stopping power and higher performance.

OEM Reference # 91135501202A
Guaranteed craftsmanship and 1 year warranty.

Fits the following Models:



Model Chassis Year Begin Year End
911 901 1968 1968
911 911 1974 1974
911 Carrera 911 1974 1975
911 E 911 1969 1973
911 L 901 1968 1968
911 S 911 1969 1977
911 T 911 1969 1973
911 T Carrera 930 1976 1976
912 912 1968 1969
912 E 912 1976 1976
914 914 1972 1972
914 6 914 1970 1971


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[Eric_Shea]

This is my favorite line:

A larger Bore equates to greater stopping power and higher performance. :D

[jim dorociak]

So I guess this is not a solution? Jim

[Eric_Shea]

So I guess this is not a solution?

It depends on what the problem is. A master cylinder is not going to give you greater stopping power or higher performance.

If you're putting the largest calipers you can fit on your car, you may need it.

I'm trying a 23 because I know a few GT's had them and I want to see if I like the harder pedal feel. I'm prepared to love it or hate it.

I like the solution it does bring about if you're looking to go 23; no extra bits and pieces etc. I may need something like that as I'm not sure the 23 I have will work with my crossbar brace.

[jim dorociak]

Eric, do you want me to send you one to look over. I just thought it might be a simplier solution. Jim
A 23 mm master cylinder is a must have if using larger calipers - much has been discussed on the 911 boards for these brake upgrades.

[davep]

I remember Harry Bytzek telling me he used one in the race car. He also used a brace, saying it made a large improvement by removing floor-flex. Part of the reason for the 23mm with 908 front calipers and GT rears (48 & 38 respectively) was that with slightly loose wheel bearings the rotor wobble knocked the pads back too much and the 23mm MC overcame this problem quickly. BTW, the 20mm MC was used with this combination beginning in 1969.

[gms]

here is another picture I found on the web, they are utilizing an aluminum cross member

[Eric_Shea]

I tried... doesn't look like I'm going to do it.

I'd have to dimple the crossmember... never read that anywhere.

Odd hookups as well.

I don't think I'd like it anyway. I'll get a new 19mm.

[Type lV Unleashed]

I just put a 23mm in today, it's identical to the 19mm I took out other than the larger plunger housing, it was a simple R&R.

I am guessing their are different design 23mm masters from the Pic Glenn posted ?

http://www.automotion.com/find.asp?m_year=ALL&model=All&level=0&find_spec=master+cylinder

[JKH]

it is probably the ebay one as above.

[Eric_Shea]

Yup... The one I have is an ATE unit.

I haven't researched but I'm afraid the eBay ones are Chinese. I'm not a huge China hater but I heard there was a higher than 10% failuer rate on those.

[jim dorociak]

I am saving one for my car project once it gets started. Eric it is hard to believe that there is a 10% failure rate, but I guess anything is possible. I can get these as I have an account set up with the manufacturer. I have been told they ship 15 + units monthly to Germany. It just seems like a much simpler solution. Jim

[Eric_Shea]

I am saving one for my car project once it gets started. Eric it is hard to believe that there is a 10% failure rate, but I guess anything is possible. I can get these as I have an account set up with the manufacturer. I have been told they ship 15 + units monthly to Germany. It just seems like a much simpler solution. Jim

I asked a major supplier why they weren't carrying them any more and they stated "more than 10% failure".

That said, I don't even know if it was the same manufacturer.

That's the info... all 3rd party so now you can value my statement for net worth. :D

I may try one of those 23's in the 19 body first... still not sure.

Like I said... I'm not a China hater. These things usually follow a pattern of trial and error before they get it right. They could be good now. The one thing that concerns me with China is the rubber. I have seen cracking issues (cheap turbo tie rods and speed bleeder nipples) which means the formula isn't right because they skimped on the antiozonates before vulcanizing. I wouldn't want that to show up on my MC seals.