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Useing alternative rear disc brakes
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Gerrelt
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PostPosted: Wed Dec 08, 2010 11:58 am    Post subject: Reply with quote

E_bug wrote:

I will machine a locating ring but how deep should I do it?
What is that dimention with the arrows?
Question


I had 2 mm machined off the surface of the drum. This was what Mike (from sharpbuilt) told me, and it was perfect!
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E_bug
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PostPosted: Sat Nov 20, 2010 1:57 am    Post subject: Reply with quote

Hello from Athens Greece.
I was inspired by Gerrelts awsome build page and I decided to have a go at it. I bought some 914 rear disks from Brombacher in Germany, they are Sebro brand and now I will have my rear drums cut. I have a question on the dimentions of the machining of the rear drum.
[img]
Image may have been reduced in size. Click image to view fullscreen.

I will machine a locating ring but how deep should I do it?[/img]
What is that dimention with the arrows?
Question
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pacorrison
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PostPosted: Sat Aug 07, 2010 2:31 am    Post subject: Reply with quote

hi folks!!!

I'm Mexican and I have this change in my mexican bug!!

now I have rear disc brakes with calipers of A4, but I use disc up front, because in Mexico is very dificult find rear disc brakes of porsche.

And I have dual circuit master cilinder stock in my car, but I have a problem because the pedal feel espogy, for that reason I will have tried use master cilynder of 20.6mm by empi.

Did you try to use the master cilynder of 20.6mm before?

do you have any tip for me?

sorry for my english, I hope you understand.

grettings from Mexico!!
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Gerrelt
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PostPosted: Wed May 12, 2010 1:27 pm    Post subject: Reply with quote

I don't know.. I don't think it's any different than the ones sold for the beetles today. The mexican beetles have discs up front too (I think?) , so it's probably the same as those ones.
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Russ Wolfe
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PostPosted: Tue May 11, 2010 1:25 pm    Post subject: Reply with quote

What is the part number on that 1303S master cylinder?
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Gerrelt
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PostPosted: Tue May 11, 2010 12:46 pm    Post subject: Re: Master cylinder Reply with quote

Thanks! Smile

kumatiger wrote:

Which master cylinder are you going to use in yours?


I am using the standard master cylinder, that belongs to my 1303 S. The "S" in europe means it's got front disc brakes instead of drums.

But I've read that the master cylinder for a Porsche 924 or 944 will fit too. And these have different diameters than the beetle one (it could be dependent on model spec though..).
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Russ Wolfe
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PostPosted: Tue May 11, 2010 9:07 am    Post subject: Reply with quote

Most later European cars, have power brakes.
The master cylinder size is designed for that.
Ever tried to stop a car with power brakes, and the engine is not running??
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kumatiger
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PostPosted: Mon May 10, 2010 9:07 pm    Post subject: Master cylinder Reply with quote

Nice work on the kit!

Given all the bad things I hear about Chinese sourced VW master cylinders, has anybody just gone to the junkyard and dropped in a master from a more recent four wheel disc vehicle? Something like a newer VW cylinder or a SAAB master cylinder (Volvo has a three circuit one I think if you really want overkill).

I'm going to start a disc conversion I'm just wondering if I should even bother with a Chinese $30 dual circuit master cylinder and if my money is better spent on a decent european master from a late model car. Also from what I hear about all the crappy brake switches, I think I'd rather just mount a switch on the pedal assembly and not worry about brand new switches failing after a month or two of use.

Which master cylinder are you going to use in yours?
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dune limo
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PostPosted: Mon May 10, 2010 8:05 pm    Post subject: Reply with quote

Nice install Smile
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Gerrelt
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PostPosted: Sun May 09, 2010 11:46 am    Post subject: Reply with quote

It's finished!

This is the entire "Kit" :

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


All assembled:

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


With the wheel on:

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

I am using the original VW beetle handbrake cable.

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


It works great! See the whole story here: LINK
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Gerrelt
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PostPosted: Mon Feb 15, 2010 12:57 pm    Post subject: Reply with quote

Here is some info on the passat brackets.

The golf and passat bracket:

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


This is the reason the passat brackets have to be used:

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


The Golf bracket is angled, this brings the caliper outwards. The Passat bracket is straight, which is more convenient for the VW beetle rear axle and Porsche 914 disk combination.

Here you see the part number of the passat bracket:

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


It reads: 5780/2 Lucas.

I also have the left drum machined too:

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

Fits perfectly!

Now I need some brakelines custom made..

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


The black flexible hose has to be connected to the copper coloured hard line. I will have to get a new flexible hose and hardline made. The new hose has to have a connection fitted at one end where the hardline can be screwed into. I will probably have to create a support plate on the trailing arm where this connection can be attached. It should eventually look just like the flexible-hardline connection in the upper left corner of the picture.
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didget69
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PostPosted: Sat Jan 23, 2010 10:40 pm    Post subject: Reply with quote

Russ Wolfe wrote:
Why not use 914-4 rear disc brakes. Probably cheaper and easier to source.
914-6 was not a common car.


914-4 rear calipers are getting harder to find; you can get the rebuild kits, but new and/or reman calipers are scarce...

bnc
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Turtletime
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PostPosted: Sat Jan 23, 2010 6:59 pm    Post subject: Reply with quote

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manxmark
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PostPosted: Sat Jan 23, 2010 6:24 pm    Post subject: Reply with quote

I would have thought that the standard disc / drum master cylinder would have been no good as the drum part of the master cylinder would have a built in residual pressure valve. If this was used with rear discs wouldn't the rear brakes drag all of the time?
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dune limo
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PostPosted: Sat Jan 23, 2010 5:54 pm    Post subject: Reply with quote

manxmark wrote:
Much like pulling on the hand brake do you mean?

I have heard of a guy that has that setup (he's in Queensland on the other side of the country). I've often wondered how well it worked for him. Maybe not that good.

If I go for the discs it sounds like it would need to be 4 wheel discs with a Porsche master cylinder.


If your twin 19 mm master cylinder is working fine that is all you need for 4 wheel disc brakes--if it needs replaceing get the 20.6 MC you get a better peddle feel
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Gerrelt
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PostPosted: Sat Jan 23, 2010 9:39 am    Post subject: Reply with quote

I've test-fitted a caliper:

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


But I discovered I have to change my (custom) exhaust. The caliper is hitting the (motorcycle) muffler..

More details here: link to new addition
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manxmark
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PostPosted: Tue Jan 12, 2010 6:15 pm    Post subject: Reply with quote

Much like pulling on the hand brake do you mean?

I have heard of a guy that has that setup (he's in Queensland on the other side of the country). I've often wondered how well it worked for him. Maybe not that good.

If I go for the discs it sounds like it would need to be 4 wheel discs with a Porsche master cylinder.
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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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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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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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