Rear Disc conversions

[Alan D.]

Hi Hans,

Been on EBay and found this drawing: http://www.ebay.co.uk/itm/Brembo-Rear-B ... 23247d1a25

Which should give you all of the dimensions, it's the same disk as illustrated in the photos posted by Rich. The only difference being we need 100 mm PCD. If there was a disk that came close to these dimensions with a 100 mm PCD. Then I think we could be in business. Somewhere I have drawings for the bracket, I have the callipers in stock, if I can get a disk rotor on a hub then I can alter a bracket to suit. I've tried drilling disks before and the are hard to drill, blunting drills frequently! So if you can find disk that is close, it would be a great help.

Alan

[Geoff Butcher]

I thought the PCD was 4". Not quite the same as 100mm...

[Alan D.]

I thought the PCD was 4". Not quite the same as 100 mm...

Well done Geoff you are right, I stand corrected. It should be 101.6 mm. Measuring with a tape and old eyes!!!

Alan

[Hans Efde]

I am a bit confused. I am looking at a drawing of a brake disc with a pcd of 100mm or 104mm? Then this one should fit shouldn't it?

[Alan D.]

I am a bit confused. I am looking at a drawing of a brake disc with a pcd of 100 mm or 104 mm? Then this one should fit shouldn't it?

Our Mk 3 cars are 101.6 mm PCD or 4 inches. (25.4 mm X 4 =101.6 mm)

The Rover 200 rear discs are 104 mm PCD.

I would need to re-drill the Rover 200 discs to 101.6 mm PCD, which I think may be difficult, but not impossible, due to the hardness of the metal! Unless it is only the braking area that is hardened, does anyone know?

I'm going to the Classic car show at the NEC Birmingham this weekend, I'm going to collect a JMR tube bender, but I'll if I can get some of those super-duper hard drills, which I think are made from "Cobalt". This may be what I need to drill disc rotors!

Alan

[Hans Efde]

Hi Alan,
And the holes for fastening it on the hub? Do they match?

[Stuart]

I am a bit confused. I am looking at a drawing of a brake disc with a pcd of 100 mm or 104 mm? Then this one should fit shouldn't it?

The Rover 200 rear discs are 104 mm PCD.

Alan

Is that a typo Alan? Rover 200's have a 100 mm PCD. I've tried to avoid posting in this thread because there are errors scattered right through it.

[Alan D.]

Hi Alan,
And the holes for fastening it on the hub? Do they match?

I doubt it Hans, But they are only holes, so they can be re-drilled. I'll try and get up to the garages in the next couple of days and sort out some of the components.

I've read through the posts on the Metropower forum and the project has a lot of doubters, saying that we would be over-braking the rear end of the car and creating and imbalance, possibly give the car the liability of swapping ends ( spinning). But the advantages are constantly adjusted brakes! But what I don't understand is that every quality or sports/GTI car has rear discs, so why not on a Midas?

It may be that Rich's work on brake bias adjustment and your ideas (Hans's) on doing away with the master cylinder and getting the free play out of the brake linkages is the way to bring our cars into the 21st century!

David M's (I think you have fitted a KAD kit is this correct) is the only person I know with rear disc brakes on a Midas. What would be your comments David?

Alan

[Alan D.]

I am a bit confused. I am looking at a drawing of a brake disc with a pcd of 100 mm or 104 mm? Then this one should fit shouldn't it?

The Rover 200 rear discs are 104 mm PCD.

Alan

Is that a typo Alan? Rover 200's have a 100 mm PCD. I've tried to avoid posting in this thread because there are errors scattered right through it.

Stuart feel free to post if I've got it wrong, correct me. It's just as usual, I've taken on too many tasks and spread myself too thinly. The more brain power the better. If the PCD is 100 mm, then we may get away with running a file through the stud holes, which would be great. I've got complete Rover 200 rear beams in stock, I just need to find them and remove a disc and try it on a A-series hub.

[Alan D.]

I've just checked that drawing from the EBay link and Stuart is correct, the PCD is 100 mm. The fixing holes for attaching to the hubs are 104 mm PCD. So we may have the correct disc rotor after all. Well done Stuart you may have saved Hans a lot of research time. I'll find a disc and report back.

Alan