Useing alternative rear disc brakes

[manxmark]

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.

[Gerrelt]

I've test-fitted a caliper:

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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[dune limo]

[manxmark]

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?

[Turtletime]

[didget69]

[Gerrelt]

Here is some info on the passat brackets.

The golf and passat bracket:

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

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:

It reads: 5780/2 Lucas.

I also have the left drum machined too:

Fits perfectly!

Now I need some brakelines custom made..

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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[Gerrelt]

It's finished!

This is the entire "Kit" :

All assembled:

With the wheel on:

I am using the original VW beetle handbrake cable.

It works great! See the whole story here: LINK
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[dune limo]

Nice install

[kumatiger]

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?

[Russ Wolfe]

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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Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey

Gary: OK. Ima poop.

[Gerrelt]

Thanks!

[Russ Wolfe]

What is the part number on that 1303S master cylinder?
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Society is like stew. If you don't keep it stirred up, you end up with a lot of scum on the top!--Edward Abbey

Gary: OK. Ima poop.

[Gerrelt]

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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[pacorrison]

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!!

[E_bug]

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]

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

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[Gerrelt]