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Rear Disc Conversion Q´s


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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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I am using VW / Audi calipers Girling model 38, with Audi 80 rear discs, they need redrilling as they are pcd 4x108, but other from that, nothing needs to be done, they are a direct fit.thumbsup.gif

I can see here that alot of other guys also use some Ford combo´s and Opel / Vauxhall parts smile.gif So i guess that there are various possibilities to choose from cool.gif

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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

Ooops forgot to say count me in for a pair of those aswell :thumbup

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So, are rear discs that much better than the std drums?

Always been of the opinion that well maintained manta drums, being the size they are, do the job well and along with fitting discs not being an easy option they would take more looking after.

If there's a simple bolt on swap I might be tempted to go for them though.....

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So, are rear discs that much better than the std drums?

Always been of the opinion that well maintained manta drums, being the size they are, do the job well and along with fitting discs not being an easy option they would take more looking after.

If there's a simple bolt on swap I might be tempted to go for them though.....

You get my vote. Knowing what I know now I would stick to the drums. Preferable manual adjuster ones.

With drums the cable handbrake is much better. You just kink the linkage to stop the eventual "lock on" if using the bat turn lever too much.

There's a pressure limiting valve anyway as if rear locks first you spin, therefore there is a limit to what the backend can do.

If the astra calipers are a step change better that might be worth changing my point of view.

There is a direct fit disk that does not need machining. Just checking the source is OK with me sharing theinfo.

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Courtesy of "Joe" and an old email. The abridged details

"Mk3 Cav 8v 4x4 rears

perfect fit on the hubs with no re-drilling necessary

the correct centre bore (57mm)

260mm diameter

They'll fit under the 14" Ronals too

www.brakeparts.com and look at the 88-96 Cav 4x4 8V.

They're the ones with the tapered top hat - BDS5260"

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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 kev

I'm planning on converting the rear brakes on my motor and I got told by a mate of ours that your the man to talk to about the kit you do if you had any left

Cheers adam

Edited by Adam west
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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

lol! Essential bodywork tool, a chainsaw!

No, discs go straight on, no mods - just need the caliper brackets and some bolts!

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  • 4 years later...

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.........

 

 

Do you have any photos or diagrams to show the handbrake cable setup?

 

Aiming to fit these to my car but it has not got any cables or brackets at all the moment...

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  • 2 months later...
  • 2 years later...

I've got the Mantamorphin bolt on kit on the back of my A.series. It looks like Sierra/Granada rear calipers with Mk3 Escort solid discs and uses the original A series cable. Ideally it looks like a longer or custom cable would improve this as when the car squats it applies the handbrake slightly. No amount of adjustment seems to stop this and the outer casing of the cables run quite tightly between their mounts. The caliper brackets look sturdy enough though. This kit mounts the calipers on top of the axle as they'd be on the Sierra. 13" wheels fit over these ok but I'll be changing to a larger set up as they look a bit small. They work ok though.

On one of my other Mantas I've made some brackets out of 6mm steel and these are welded in line with the square section on the end of my axle. This one uses Sierra Cosworth 4x4 vented rear discs and calipers with no spacers. I've had Speedy cables shorten me a Sierra cable and this seems to be a tidier conversion. This one has the calipers mounted behind the axle and looks better. These discs are about 280mm if I remember right. They need 15s to clear them. The Sierra discs needed redrilling to 4x100 and a small spigot ring between the stub on the shaft and the middle hole in the discs. This is the set up I'll convert my A series too, along with the 280mm front Sierra Cosworth discs and Vectra calipers.

Some of those modern Alloy calipers sound like a good idea now as Sierra ones are getting rare and expensive.

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If you are looking at the sierra rear callipers i think i used the BMW 318 rear discs

http://www.theopelproject.com/?p=105

Not sure if there is a BMW 5 bolt disc that will be the right setup to use with the sierra callipers. Made my own brackets so i could position the callipers in the right position to use the original cable and it all fits perfectly.

Just thought i would add this as if its not right for you it might help someone.

 

Andy

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  • 2 years later...
On 26/11/2017 at 11:50, yeti132 said:

As anyone done a set up for a 5x120 conversion 

EEAD7C4F-EA4F-46B7-8F02-25381A9817F5.jpeg

Has Anyone Done a Disc Brake Conversion for the 5 Stud Rear Axle (Std Axle with Commodore Shafts) So Axle has Std Centre Bore.

If So What Discs Did You Use in 5 x 120 Pcd that Had the Correct Centre Bore or How Did You Overcome This Problem

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What is the od of the flange?
 

I usually just use the Brembo part finder to try and match up.

https://www.bremboparts.com/europe/en/catalogue/size?producttype=Disc&diameter=330&th=28

BMW would be a good starting point I guess for the 5x120, quick look E36 316 compact

 

 

Edited by Jessopia74
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