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Rear Disc Conversion Q´s


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Hi guys.

Need your help on this topic. I am making a rear disc conversion using the Girling 38 setup fra Audi/VW. The brake calipers also function as handbrake, so no drum brake what so ever.

Anyways, i am about to purchase a set og adapter plates for mounting the Calipers.

I searched the internet and found that MantaMorfin once did this conversion as a set you could buy for 350£. So heres my question, what discs are used with this kit ? I can see from pictures that they are re-drilled in PCD, so maybe its some Ford part ?

Anyone here that has this setup?

http://www.mantaworld.com/opel-manta-tuning/mantareardisc.php

I allready have the calipers on stock, and are about to get the adapterplates made.

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I mentioned this further up, and I know it may not be much use to some, but forget the old ford calipers as they are rather heavy these days, use mk4 astra alloy rear calipers and discs, they go strai

Last rear disc conversion we did was MK4 astra rear discs and calipers and bolt on brackets. All bolt-on, picks up on 3 of the axle tube to backplate bolts and the great bit is that the astra handbrak

On my  Manta I have Cossy/4x4 vented discs with Cosworth/Granada calipers, when I fit my Commodore shafts I plan to use Granada 4x4 vented 5 stud discs with the same caliper...think I need to enlarge

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when i did my conversion i used vectra diesal rear discs with astra calipers. mounted them using ford weld on mounting plates as hole pitch is the same

1. fit disc

2. mount caliper to weld on bracket

3. fit new pads to caliper

4. using compressed air pressurise caliper so it finds its own position relative to disc

5. weld in place.

kev

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when i did my conversion i used vectra diesal rear discs with astra calipers. mounted them using ford weld on mounting plates as hole pitch is the same

1. fit disc

2. mount caliper to weld on bracket

3. fit new pads to caliper

4. using compressed air pressurise caliper so it finds its own position relative to disc

5. weld in place.

kev

Yes thats also the way alot of guys have done it, but this set is bolt on and no welding is included ! Wich i think is very smart as the entire brake setup can be moved, or dismounted and made back to drumbrakes in a matter of very few hours! thumbsup.gif

That is why i have chosen this setup instead of the one you have. Also this setup with the girling caliper makes your handbrake hydraulic at the same time (the calipers can be activated by cable as well). I think you still have the drum brake function on you car ?

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It is the kit myself and Gary ( mantamorfin was our site) used to make.

We used ford escort mk 3 front discs and the brackets i custom made.

Ford rear calipers

Cheers

Kev

I have some kits nearly made up but not quite done, time is the killer :(

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It is the kit myself and Gary ( mantamorfin was our site) used to make.

We used ford escort mk 3 front discs and the brackets i custom made.

Ford rear calipers

Cheers

Kev

I have some kits nearly made up but not quite done, time is the killer :(

Hi Kevin, thankyou very much for your feedback, thats very good to hear. What Escort Mk3 discs did you use ? thumbsup.gif

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Last rear disc conversion we did was MK4 astra rear discs and calipers and bolt on brackets. All bolt-on, picks up on 3 of the axle tube to backplate bolts and the great bit is that the astra handbrake cable can even be easily adapted, just needs a bracket fitting to the prop crossmember to mount the front of the cable outers, and a "block" to receive the std manta threaded adjuster and the front end of the two cables.

Can't remember what I have done with the bracket drawing, although its somewhere around and I will dig it out. The brackets are around on the net for sale though, saw some on ebay a while back

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Thanks for the info thumbsup.gif

I have just been in contact with the supplier and they say that Audi 80 rear brake discs (240mm) are normally used for this setup, also this conversion doesnt need spacers or anything else to run, its simply plug and play laugh.gif

Only thing to do is to redrill the Audi discs to 4x100 (they are 4x108 like Ford). .

Anyways, thanks for all the help, and good info i will take some pictures when doing the conversion to upload under projects in case anyone else would be interested smile.gif

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I've got a quick question to add while were discussing rear brakes.

Bought a pair of brackets off e-bay years back and i'm finally getting around to fit them.

They're 6mm thick flat plate that fits to the back of the axle flange covering 2 holes and it has one long side that sits against the head of a lower bolt to line it up

I've drilled through the top 2 holes so i can refit the upper bolts already.

I also have some Escort front discs re-drilled and they fit snugly over the halfshaft flange

Now comes the problem, the sierra calipers i have don't line up right for the disc :(

They need to be inset further towards the centre of the axle.

So a question for those of you who have used the sierra caliper/escort disc setup

does the bracket have an offset or is it spaced away from the axle flange somehow?

Only had a quick look at it all today so if i've missed something obvious i might spot it tomorrow but thought i'd check here first.

Also what handbrake cable do you use with the sierra calipers?

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After running with the Ford Granada rear calipers for 9 years / 100K miles I would say in my opinion, choose another caliper.

So a question for those of you who have used the sierra caliper/escort disc setup

does the bracket have an offset or is it spaced away from the axle flange somehow?

Spaced, let me see if I can find some pics

Also what handbrake cable do you use with the sierra calipers?

People say a sierra one fits, I cut one down so using the standard Manta "yoke" on the threaded hand brake bar and about a foot or so of outer.

The course thread plastic adjusters are also retained on the outer sleeve against the trailing arm.

DiskBackPlate.jpg

j20100814_01.jpg

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You should be able to use the cable from Opel Rekord (Royale?) that one is a bit longer but is otherwise exactly the same.

Yeah you should put a spacer in between the disc and the axle, but you can also use the setup that i will be going for, Girling 38 calipers from VW and Audi cars, combined with rear Audi 80 discs, they fit with no spacers, only need to redrill the discs to 4x100mm pcdsmile.gif

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You should be able to use the cable from Opel Rekord (Royale?) that one is a bit longer but is otherwise exactly the same.

Yeah you should put a spacer in between the disc and the axle, but you can also use the setup that i will be going for, Girling 38 calipers from VW and Audi cars, combined with rear Audi 80 discs, they fit with no spacers, only need to redrill the discs to 4x100mm pcdsmile.gif

No spacer between disk and axle

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The conversion i do ( or used to )uses the ford calipers and spaces them back 25mm to give more clearance and will even fit under a 13"rim.

To be honest the disc now looks a bit small now everyone is running 17s but it stops better than drums and is less unsprung weight.

reardiscconversion.jpg

pics05033.jpg

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That sound about right, i had them figured around 250mm i event thought about using original Manta frontdiscs on the rear biggrin.gif

I´ll be running Carlton GSi frontbrakes (296mm) thumbsup.gif

hi

are carlton gsi brakes a direct fit,run a gsi 24v anyway so have a few spares[,ie whole car spare]

cheers

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hi

are carlton gsi brakes a direct fit,run a gsi 24v anyway so have a few spares[,ie whole car spare]

cheers

Hi smile.gif

There are two issues when fitting those brakes, but its quite simple operations that need to be done to make em´ fit.

The discs needs to be redrilled so the original wheel adapters kan be mounted. (4 stud pattern). And then the offset is a little bit off. Theres two ways of taking care of the offset.

1. The calipers mounting surface need removal of 2 mm of material.

2. (what i have done) the inside of the discs mounting surface need removal of 2 mm of material.

Thats it.

Those brakes are massive, and will never take a 13 og maybe not even a 14" wheel... blink.gif

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I mentioned this further up, and I know it may not be much use to some, but forget the old ford calipers as they are rather heavy these days, use mk4 astra alloy rear calipers and discs, they go straight on, with a pair of brackets, no spacers, no redrilling, and the astra standard handbrake cable goes straight on with a small mod to the prop crossmember to mount the cable outers.........

2010_03060070.jpg

2010_03060069.jpg

Edited by Retro Power
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Hi there, chain saw to cut off totque tube????:lol: :lol: . Seriously, did the discs need redrilling to slide over the studs and will this set up work on an A series manta? and if so how much will the brackets be, looks a very neat conversion with easily obtainable parts, cheers John

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PS if a few people are interested then I will get some astra mk4 to manta axle brackets cut, if its a few sets then they will be cheap enough

hi

maybe stupid question,does it matter what disc/caliper combo,for the bracket,what ones did u use,notice quite a few mk4 combos,size etc

interested in a set of brackets for myself

cheers colin

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hi

maybe stupid question,does it matter what disc/caliper combo,for the bracket,what ones did u use,notice quite a few mk4 combos,size etc

interested in a set of brackets for myself

cheers colin

I am guessing that you would use the 240mm solid disc like this

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