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Useing alternative rear disc brakes
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Gerrelt
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PostPosted: Sun Dec 27, 2009 12:46 pm    Post subject: Reply with quote

Well, my car is in hibernation (they salt the roads here in the winter), I can get going on this project.

I allready bought me some Golf IV calipers:

Image may have been reduced in size. Click image to view fullscreen.


And I got two "sport" rear Porsche 914 disks:

Image may have been reduced in size. Click image to view fullscreen.


And I dismantled the rear drums.

Image may have been reduced in size. Click image to view fullscreen.


Test fitting the brackets from sharpbuilt (Mike):

Image may have been reduced in size. Click image to view fullscreen.


They fit perfectly!

Now I have to get my drums machined and I need to get two passat caliper holders.

See also this part of my site: link to gerrelt.nl
(a few more detailed pictures can be found there)
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Gerrelt
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PostPosted: Sat Jan 09, 2010 8:48 am    Post subject: Reply with quote

My neighbour was kind enough to machine a drum from me.

Before and after:
Image may have been reduced in size. Click image to view fullscreen.

It's quite a bit lighter! Smile

This was left:
Image may have been reduced in size. Click image to view fullscreen.

Scrap iron...

A test fit:
Image may have been reduced in size. Click image to view fullscreen.


With the disc on:
Image may have been reduced in size. Click image to view fullscreen.

I am very happy with it, everything looks good.

I still need two M6 bolts to hold the disc.
Now, I hope my neighbour soon has some time to do the other one... Cool
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Russ Wolfe
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PostPosted: Sat Jan 09, 2010 9:56 am    Post subject: Reply with quote

You will need flat head bolts I believe for those locater bolts.

You may have been able to save the machine work, but just sourcing a set of T-3 rear hubs. That is how 4 bolt Type 3 brakes are made. Seperate drum and hub, but the same bolt pattern as a bug.
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gr8cobbler
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PostPosted: Sat Jan 09, 2010 3:04 pm    Post subject: Reply with quote

Found this info "kit" on eBay that pertains to this thread, Anybody seen this kit or have an opinion on it's value?

http://cgi.ebay.com/ebaymotors/VW-Trike-Dune-Buggy...3ca90d521c

"You are bidding on plans to build your own disc brakes for your VW type I based Trike,Buggy,etc. Plans cover what vehicles to scavange parts from in the salvage yards and what modifications are required to make the useful on IRS as well as swing axle suspension. You will get patterns and instructions for making brackets.Using these plans I was able to build the rear brakes on my buggy for 15.00 worth of junk yard parts 15 years later they're still going strong. Disc brakes are a huge improvement over factory drum brakes these plans do not require welding and do not have emergency brakes."
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Russ Wolfe
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PostPosted: Sat Jan 09, 2010 3:08 pm    Post subject: Reply with quote

All that is, is the plans to build the adapters for the calipers. You still have to buy the calipers and rotors, plus the ebrake adapters.
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gr8cobbler
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PostPosted: Sat Jan 09, 2010 3:24 pm    Post subject: Reply with quote

How comprehensive do you think the donor list might be? I'd also assume there are donor parts that are a lot less work than others too.

Buying the available kits front and back will probably set me back on the upside of $600, the idea of adapting salvaged parts appeals to me. I do however appreciate the importance of stopping and don't want to cheap myself out of a longer life.... Laughing
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Russ Wolfe
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PostPosted: Sat Jan 09, 2010 3:28 pm    Post subject: Reply with quote

Calipers from a GTi/Jetta with rear disc brake will have the built in Ebrake.
Might look into their rotors too.
Make the adapters.

I know when my son wanted to upgrade the brakes on his Honda Civic, the rotors that were shipped to him was in a box, and marked for Corrado.
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gr8cobbler
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PostPosted: Sat Jan 09, 2010 3:35 pm    Post subject: Reply with quote

Thanks, I'll start prowling the local yards....when the temp gets a couple of degrees above freezing! Rolling Eyes Very Happy I'm doing a lot of armchair building lately....
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manxmark
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PostPosted: Sat Jan 09, 2010 4:24 pm    Post subject: Reply with quote

Mike is there any way of using your kit with a wide 5 set up as it would be nice to have four wheel discs but I don't want to part with my wheels.

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Is a Porsche 944 master cylinder a bolt in fit? Would that be suitable if I converted to discs on the front?
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Gerrelt
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PostPosted: Sun Jan 10, 2010 9:22 am    Post subject: Reply with quote

Well, there was the Porsche 914/6. That one had the five bolt porsche bolt pattern.
But I don't know if those discs had the same size and thickness.
It the diameter is bigger, Mike's bracket will probably not fit.
If the discs are thicker (maybe they are vented?), then the Golf calipers will probably not fit.

But I am sure Mike will give some certainty in this.
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dune limo
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PostPosted: Sun Jan 10, 2010 6:24 pm    Post subject: Reply with quote

If you use the type III hubs for these they will need machineing down as the diameter is to big to fit into the disc

Mark you might want to look at these, I know the frieght charge for front and rear- 5 stud disc's will kill you

http://www2.cip1.com/ProductDetails.asp?ProductCode=ACC%2DC10%2D6709

You will need the twin VW 19mm master cylinder if you go front/rear disc, though the 20.6mm units have a better firmer pedle feel, I have some 20'6mm units for this for the early or late pan
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manxmark
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PostPosted: Mon Jan 11, 2010 3:21 am    Post subject: Reply with quote

Mike my pan is a superbug with a link pin front. My master cyl is the one with the diagonal bolts. Is that the master cyl you are talking about?
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Gerrelt
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PostPosted: Mon Jan 11, 2010 1:31 pm    Post subject: Reply with quote

Can't Mark use these: link to 914/6 discs, in combination with mike's brackets?
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Russ Wolfe
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PostPosted: Mon Jan 11, 2010 4:46 pm    Post subject: Reply with quote

Why not use 914-4 rear disc brakes. Probably cheaper and easier to source.
914-6 was not a common car.
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manxmark
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PostPosted: Mon Jan 11, 2010 6:36 pm    Post subject: Reply with quote

Are they wide 5 stud patteren?
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Russ Wolfe
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PostPosted: Mon Jan 11, 2010 6:58 pm    Post subject: Reply with quote

manxmark wrote:
Are they wide 5 stud patteren?


914-4 is 4 bolt. The original poster is working with 4 bolt.
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Gerrelt
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PostPosted: Tue Jan 12, 2010 12:06 pm    Post subject: Reply with quote

@Russ: I think he replies to my message. Smile

manxmark wrote:
Are they wide 5 stud patteren?


A quote from this site about the 914-6:

www.porsche914.org wrote:

Major differences, in addition to the engine used on the 911T, included standard chrome bumpers and vinyl covered roof sail panels, five bolt 911 steel wheels with the option of Mahle or Fuchs five bolt alloy wheels,and leather upholstery.


So it is the wide five Porsche pattern (5x130?).
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dune limo
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PostPosted: Tue Jan 12, 2010 3:34 pm    Post subject: Reply with quote

manxmark wrote:
Mike my pan is a superbug with a link pin front. My master cyl is the one with the diagonal bolts. Is that the master cyl you are talking about?


Yes that will be the twin master cylinder (19 mm) the 1200 pan only had the single cylinder
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manxmark
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PostPosted: Tue Jan 12, 2010 6:00 pm    Post subject: Reply with quote

I wonder what the brake balance would be like if I ran your disc setup on the rear and kept the drums on the front and plumbed the master cyl accordingly?
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Russ Wolfe
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PostPosted: Tue Jan 12, 2010 6:07 pm    Post subject: Reply with quote

Drums front, disc rear, is a no-no. The front brakes do about 70% of the stopping on any car. If you would change the bias that much, the car would try to swap ends when you used the brakes.
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