any one done a rear disc conversion on a mk1 golf?

yep, mine are screwed into the bottom of the master cylinder.

Going to be a pain if if it turns out they are the pressure regs as I don't think I have downward facing outlets on my M/C… unless I can plumb them in further down the lines to keep the engine bay looking tidy!

How did you do your good ladies?

I'll check my chassis number tomorrow when I'm out in the garage.

Had a look on Vortex, you are spot on and yes I was looking at the 8V Scirocco :-( on ETKA.
You can still get them new as you said from here
http://www.volkswagen-…s.de/bestand/index_e.html
Search on part number 533612151 and both are listed as new production parts, the 16V ones are cheaper.
Would like to know what pressure each of then limits the rear brakes to, to see if it is worth changing them to the correct ones.

And a little bit more off Vortex:-

If you use the 239mm disks you can stick with 533612151,
but for 256mm use 533612151A.

So my guess is that the A version allows more braking to the rear because of the larger front calipers and disks give a greater front braking force…

hi guys, iv got a cabriolet so i shouldnt need to bother with all this ? or should i, as long as it passes a mot im happy as i drive every where at 15mph anyway

and i will be useing 239mm disc of mk2 so will i be ok lads?

mk1timmy you still need some sort of biasing device or you will upset the cars braking, too much rear effort is dangerous, lhasadreams regarding what i said about the drum bias valves holding pressure read it a few times over the years will see if i can find a source but i had understood it to be a bad idea to use a valve which holds pressure as it would hold the rear brakes on slightly with rear discs

right , im really tryin my best to understand all this im more of a hands on guy, has ihasdream use the  original valves on a cabriolet and it has pasted a mot with this set up? if so i think i will go with that setup, but  do you think it will hold the back disc on slightly as the original drum valves hold pressure ?

hi, sorry to be a pest, but i was lookin on ebay and it list mk2 mk3 stub axles as the same , so if i find a late mk3 could i take the stub axles of it and bolt them straight onto my axle, and use the calipers and caliper carrirers and disc with the flexihose and get a scirrocco 16v handbake cable and im away? thanks  for all the help upto now lads,

Ok, so i'm already running 256mm fronts. So its the latter fellas I'm looking at.

Just to add a spanner into the works, remember the 16v scirocco is lighter at the rear then a Mk1 cabrio. This would affect the choice of valves too and might explain your success with your other halves sportline.

Ade, could you take a photo or explain how you fitted the valves with the 22mm M/C? Would be a massive help.

Does anyone know about the use of the Astra GTE valves then? close to 16v ones or Cabrio?

Never had any trouble with binding on the rears, I don't think these valves hold a residual pressure, but I could be wrong !! I would think that after 2 years if they were binding we would have worn the pads out or smelt it.

I got a 4 outlet 22mm master cylinder and made up some pipes so that the pressure valves remain vertical at the side of the car, to the right of the master cylinder on the passenger side. Make sure you plumb them in the right way up !! I wasn't sure if the valves would work properly if screwed in to the master cylinder, which would make then nearly upside down. Away with work at the moment so cant take a pic.

Not sure if the mk3 stub axles are the same.

I can only tell you about my setup and then you have to make your own mind up which route to go. We are talking brakes here, so if you are any way unsure then leave the drum setup as it is. I just hate the way the rear drum adjusters don't work and therefore the pedal feel is naff. Disks resolve this .

Might just go the cabrio pressure regs route to be honest. If its passing MOT's and not binding then thats good enough for me! Might look at mounting them on the bulkhead to keep them upright.

As you said though, I would be interested in seeing what the difference in Bias is. Could be a little project there for the future!

mk3 stub axles work fine, scroll down to the bit about the proportioning valves rabbitgtipage.com

Some more rear disc brake conversion ?'s | VW Vortex - Volkswagen Forum

cheers for that smokey gti,

Looks like I may have to fabricate some kind of proportioning valve onto the rear beam. Might see if I can get one from an earlier cabrio or mk2 and see what I can come up with. Owing to how low the car is I'll need to adjust it anyhow.

Easiest solution is 16v scirocco proportioning valves but then these cost 200 euros the pair, cheaper solutions being in line adjustable racing valves or the mounting of a rear axle load valve from a mk2 golf with rear discs i suspect the mounting of the load valve would be the easiest (cheap) solution, i have a feeling there was a thread kicking around somewhere where someone had done just that, may have been on club gti

any chance i can ask a favour..
can you add a thread to this with piccies etc. - help the rest of us out when we want to do the same thing
cheers

another option is to do what i did, make up a bracket so you can mount a mk2 golf pressure regulator under the car. lucky for me i had a mk1 item here so i had the springs and the plumbing, but unukily it was siezed so i had to change it. since mk1 items are scarse and i had a new mk2 one in stock i went ahead with this method.

plate is dead simple just flat bit o metal with 4 holes in it. done worry the bit of shelving bracket was binned i was just using it for mockup purposes

I had a feeling it was you i was referring to above john

aye thats me, pikey northerner who avoids spending money wherever possible

i did this last summer on my sportline i did what you lot seem to be doing reading to much getting well confused so heres what i did i got well carried away as brought it all new
i used 280 mm ebc drilled and grooved disks and green  stuff pads g60 calipers with conversion brackets of ebay (*which need a bit grinding off)
22m/c and 9 sevro
good ridge hoses
at the back i used mk 4 golf calipers,mk2 bearings and stub axles ,mk2 disks and mk4 pads .
good ridge hoses you also need c&r goodridge conversion hoses as well you also need to fit new brake lines just makes it easier
i stuck with bias valves of my cab which work fine
the only problem i came across was pedal was really soft end up adjusting bar across bulk head and backs were a bit of a pain to bleed
the car now stops dead in seconds!!!!had it down a mates mot place and had it on brake tester results were great so well worth it!!!