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  #1  
Old December 30th 2002, 08:58
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A different aproach to front Porsche brakes

Hi

I have been doing some thinking since I finished the Porsche brakes on my bug. On the front if I did it again I would go about it another away.

This applies to factory disc brake equiped cars. I would use a stock beetle rotor or drum, remove the braking surface, then use this as a mounting flange for Boxster rotor, use a Boxster caliper, these have a radial mounting bolt, have a square alloy block made up to bolt to the factory caliper mounting points and then the Boxster caliper bolts onto the alloy block. You would get a small track increase using Beetle rotor as thick as the mounting flange and lesser increase using a Beetle drum as they give a smaller track from the factory. The increase in track would only be the thickness of the mounting face on the Boxster rotor x 2.

I dont have any Boxster parts to measure up, Im sure this could be made to work, does anyone have any dimesions of the Boxster rotor? I know they are 298 mm x 24 mm but I dont know the depth of them.

Steve C
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Old December 30th 2002, 09:14
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Steve

this is one of the ways that Jim Andritsakos & I were talking about doing the conversion on my car.

You would get a VW rotor drilled in 5 x 130 pattern, machine it down until it is just a hub. Drill 2 holes in it for the 2 small centering bolts & purchase 2 Porsche rotors & 2 matching calipers.
Now all you would have to do is fabricate a mounting bracket for the caliper.

We are also looking at the possibilty of using 944 Hubs & having them machined to fit VW spindles.
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  #3  
Old December 30th 2002, 20:47
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Been there done that with a non turbo rotor and caliper. The stock disk rotor is too thin to try this. The CSPs will work fine as they have a much thicker flange. It only increases the track about 3/8 inches. In fact I bought spacers to bring out the front as my wheels have 52mm backspacing. The hubs them selves aren't to bad, but the adapters are alot of work to get right. So far I haven't found the ghia style spindles to be as easy to work with as the drum spindles. The big problem is weight and lots of it. I calculated the total assembly with wheel and tire, lug nuts etc is running around 45 to 50 lbs while the stock drum setup with wheels and tire etc is around 35 lbs. I plan on weighing everything as soon as I have found my scale. I think it is going to be an eye opener. Hope it helps.
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Old January 1st 2003, 04:17
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Hi

The rotors I used for my conversion already had 5 studs and a thick flange, I bolted 911 rotors to the back of them. I think that the stock 4 suds drums would be pretty thick. In my case the problem with the 944 hubs is the track increase. Using a boxster caliper with radial mount makes the caliper mounting a simple square block like the one below.

Steve C

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Old January 1st 2003, 10:57
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thanks for the info Steve

I am still looking into this at the moment.
This way be the way to go.
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  #6  
Old January 1st 2003, 18:40
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Brake conversions

You have probably all seen this but

Sounds kinda like the MBT conversion



MBT

or this one that you may have also seen...

[IMG]http://groups.msn.com/_Secure/0RwAAACIWZyulLiKgspctihUoe4RTuF4acwqiSRHI04xU0388e s50U0dXyGWNHtyTMTw82OctP!0lV9!L*dF3uQ2Ua85wj2hQm5C IIEeKrQc/captureD3.jpg[/IMG]

from VW911 site

Bugzilla

darren

Last edited by darren; January 1st 2003 at 18:54.
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Old January 1st 2003, 18:45
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Angry

Ok pics dont want to link, but thats the addresses for them if you want to have a look.

Oh and if anyone has any clues why the pics aren't showing, let me know.

darren
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  #8  
Old January 1st 2003, 21:22
chigger chigger is offline
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Humm! Your adapter looks alot like mine. Due to the difference in the parts used and their dimensions it appears the adapters will always look similar, but have slightly different shapes. I hope you had as much fun making it as I did. The hardest part was trying to get measurements off the existing piece. One thing that is nice using the metric system is that most measurements were in whole numbers instead of fractions of a mm etc. 23mm not 23.2mm. Well my front and rear adapters are done and it is time to go on to something else. I wish you luck as I don't particularly want to do it again.
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  #9  
Old September 14th 2007, 03:24
alikatcraig alikatcraig is offline
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You may be interested to know that the Mexican VW factory ended up producing 2 piece Bug front discs! Much easier conversion.
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  #10  
Old September 14th 2007, 20:42
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Quote:
Originally Posted by alikatcraig View Post
You may be interested to know that the Mexican VW factory ended up producing 2 piece Bug front discs! Much easier conversion.

Pics or link to pics? Never seen them.

Jason
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  #11  
Old September 21st 2007, 02:11
alikatcraig alikatcraig is offline
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I will have a look at my '98 tomorrow (if I remember). If not I will dig out the p/n's. Chris ****s at Small Car in Hesperia should have them.
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  #12  
Old September 24th 2007, 22:11
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There you go
Attached Images
File Type: gif 95 on.gif (17.2 KB, 152 views)
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  #13  
Old September 28th 2007, 17:59
jamesbissland jamesbissland is offline
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Pacific Customs are selling these for $36US each..
Certainly makes it easier than machining the back off a drum to make a hub!!
Also available in wide 5
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File Type: jpg front hub AC407004.jpg (37.0 KB, 86 views)
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  #14  
Old September 29th 2007, 02:19
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Quote:
Originally Posted by jamesbissland View Post
Pacific Customs are selling these for $36US each..
Certainly makes it easier than machining the back off a drum to make a hub!!
Also available in wide 5
They look nice and beefy as well.
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  #15  
Old September 29th 2007, 07:45
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Quote:
Originally Posted by alikatcraig View Post
You may be interested to know that the Mexican VW factory ended up producing 2 piece Bug front discs! Much easier conversion.

What's the story?

What year Beetle had those? I can contact some people I know at VW in Mexico (I email them weekly for work related things already though they may not know the answer to this question) to see about getting a set:agree:
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