Late bay front brake question???

[marcher]

Good evening chaps,

I have sourced a set of front late bay brakes(full kit) on VZI.

i know that it will change the pcd etc, dont mind because i'm running Fuchs.

Just a quick question......will they work ok with out a vac dizzy/servo???? I only have the wide 5 set up.

Will it be just a stright swap over????

hopefully i'm not being to blond :lol:

cheers

 

[dubdubz]

it's not as blonde as it seems.I think the master cylinder might need to be changed as it's running discs - I really can't remember but I vaguley think it does.....I have a 72 that runs disc and doesn't have a servo - but I don't know if the MC on that differs from the standard earlier wide5 MC?

search on heritage should assist as it might show 68-70 for eg and the 72-78 or something on the MC suggesting there was a change associated with running discs........??

 

[speedwell68]

You will need to swap to a late master cylinder. Are you intending on using a servo? If so, the you will need a servo master cylinder and if you are running a stock carb you will need the centre section of the manifold with the take off for the servo. This should make no difference to the vacuum take off for the dissy as that is on the carb above the throttle butterfly. The other thing with fitting a servo is you will have to modify the beam in order to mount it.

 

[marcher]

I was not going to use a servo if i didnt need to???? Will the brakes not work without one???

I thought all i would need are new flexi hose's??? or have i been lead up the garden path???

Told you i'm a little blond!!!!

cheers :|

 

[dubdubz]

if you look here

http://www.vwheritage.com/vwh/VW-Ca...8-79\Brakes\Brake-Pipes-Servo\?templateID=vwh

there are lots of MC's listed-theres about 4 late ones for use w/o servo so go for one of those to simplify your conversion.

out of interest - are the fuchs, SSP ones , if so what do you think of them?

 

[marcher]

cheers m8.

I had my MC replace last year??? not sure why i would need to replace the one i have. :? :? :? :?

Do they have better pressure?? Different fittings???

The fuchs i run are original porky one.

 

[speedwell68]

cheers m8.

I had my MC replace last year??? not sure why i would need to replace the one i have. :? :? :? :?

Do they have better pressure?? Different fittings???

The fuchs i run are original porky one.

I have late brakes without a servo and they are just fine. AFAIK there is a difference in pressure output between a drum brake cylinder and a disk brake cylinder. AS you say you will also have to replace the flexis. Are you also aware that you will have to replace the steering knuckles (often called spnidles) from drum brake ones to the later disk ones.

 

[marcher]

cheers m8, i was thinking that i could use the late set up.

this is the set up that i'm trying to get.....

trailing arms, spindles, discs, calipers, track rods etc from above beam, need overhauling, but good for building up a beam, changing ball joints etc etc (can split if required)... £35 a side, £60 the lot

Other then just the flexis would i need any thing else?????


Speedwell68. Are the late disc brakes much better then the drum set up????

 

[speedwell68]

Speedwell68. Are the late disc brakes much better then the drum set up????

Hell yeah, stops like a car. With some slight mods you can actually incorporate T25 automatic adjusters into the rear drums, my Dad has worked out a way of doing that.

 

[uber cool]

Speedwell68 is spot on. I've fitted late discs to mine. But still using early master cylinder. Done 2000 miles no problems. Brakes miles better. But I'm also going to fit a servo and late MS just to sharpen them up even more before new big engine upgrade over winter

 

[ground hugger]

Hi
Ive got a 72,No servo .The front pipe from the master cylinder goes to a Brake pressure regulator,then goes to the rear .Its split with a " T piece " for the left and right rear brakes.The rear (second) pipe out of the MC goes to a "T piece" this splits the front left/right brakes.

Looking at this set up you will require
2 front flex brake hoses
2 solid brake pipes "From the calipers"
And the brake pressure regulator.
Pm the guy on Vzi and see if he has the regulator before he scrapped the van ,if so you should be good to go unless the calipers want looking at.If I remember right this will widen your track by 5mm a side

 

[ronmidg]

the split screen mc has a reservoir on the mc and a check valve which is overcome by the drum springs, this will hold disc brake pads on, experience shows definitely needs changing if fitting discs, check the SSVC forum. Haynes picture of the early drum bay single circuit mc shows a 'residual pressure valve' which looks just like the split check valve, the words in the intro say a check valve, but then goes on to say not enough pressure to move pads. This last bit sounds odd and goes against the split experience, if you have a single circuit mc I would change it for a disc set up.

 

[uber cool]

I thought all bays are dual circuit brakes, see diagram below.

Mine a 68-69 and has dual circuit brakes. I believe a dual MS is ok with disc setup, is this correct?

 

[ronmidg]

I believe a dual MS is ok with disc setup, is this correct?

agreed

 

[dubdubz]

sorry to drag this thread up again....

68 bay with later beam using 71-72 discs and servo

as I'm not sure what stopping bits I intend using due to me not yet knowing whether I'm going wide5 drums or narrow5 later discs....BUT I was intending using the MC with servo which was powering discs......

so if I did use Drums up front instead of discs can I still use this servo'd MC? amd where do I get servo vacuum pipe from? my bus doesn't have the metal pipe afaik so it'd be a complete run [ as it is currently but hose is old ]

thanks

 

[Airtime]

amd where do I get servo vacuum pipe from? my bus doesn't have the metal pipe afaik so it'd be a complete run [ as it is currently but hose is old ]

thanks

I have an answer for this question. I am going to solve it like this:

Between the carb and manifold there is a thick plate (or adapter) where you can put a vacuum pipe in.

I also have a question concerning the conversion: I have the complete setup now (front and back), and I am currently refurbishing everything. I don't have the 'hard lines' from the calipers to the spindles, but are they really necessary? I really can't figure out why I can't just directly attach the flex brake hoses to the calipers (and use the standard flex hoses for drum brakes). :?