Hello all,

My first post is to enquire about rear disc conversions; any one know where to get a kit from?

Cheers

Hi,

I don't believe there is a kit for the rear discs. There are a few people that have converted to discs. Dave Puzey has done it and I believe he has written an article in the club magazine. I will try to find it.
I do not see the reason behind it myself. I have always found the rears to be adequate on drums. I have 16" wheels with 225 tyres so lots of grip. The extra grip on the front means that more weight is transferred to the front on braking meaning more likelyhood of the rears locking up! Not good! Increase the braking capabilities on the rear and this is even more likely. I do have the Jaguar XJS discs on the front however.

I would like to hear other peoples views on this, especially from those that have carried out the conversion. Is it worth while?

To be totally honest, I want to do it for the look of the thing as much as braking.

On my last TP Vitesse I had the Jag brakes at the front and drums at the rear - it had amazing stopping power.

My old wide arch had Jag up front and drums rear.
Seemed fine to me
That said when i build another one it will be getting discs at the back

Is the rear disc conversions worth it? I know they look good if you have the rite set of alloys.
I want the jag fronts but I will leave it drum at the back

I have a totally standard setup on my tp and K5 has his with jag fronts and discs rear and i can conclude the difference is MASSIVE! his car really stops!!

Jag fronts are waaaay better, really want to get another set.

Hi all.

My 1 post to this forum..

I have got rear disck brake kit my sd1.
Rover 800 rear calibers and hand brake cables. + mercedes benz 290x10mm disc.
Almoust identical as this, but this car has got rover 800 disc 260x10mm
have a look this link.

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I have got also firt this rover 800 disc, but i want to bigger brakes "disck", because my wheels are 17inc and 260mm disck look very small to big car/wheel..

I can post some pick if someone want?

Would be nice to see for some reference. Theres some XJ40 discs here gathering dust...

Thats interesting... So that means If I get such parts machined I could just tell them to screw the 127mm boltpattern and machine me BMW pattern right?

This is just my two pennyworth.

I confess, I dont know what the attraction of rear discs on a road-going sd1 is, or how important it it is to have them on a track car, for instance.

However I can more or less see the attraction (with reservations) of fitting uprated front calipers such as the jag system to enhance the stopping power.

As there is a considerable transfer of weight onto the front wheels when braking, the SD1 balance valve directs most of the braking energy to the front wheels. The back brakes being less efficient also get less braking energy. But that balance valve would be rated to account for the difference.

This is important because if the front brakes lock up then it would be a distinct advanvantage for the rear brakes to maintain traction (and drive) to steady the car under braking.

It does not help control of the car if the rear brakes lock up too.

If an even stronger system is fitted to the front brakes then it stands to reason that even more weight is transferred to the front wheels under braking and the back end becomes even lighter.

That would imply that the balance of braking energy would need to be adjustable. Which on a standard setup, it is not.

Worse, if very efficient rear discs are fitted at the same time as an uprated front end then it seems to me that the back brakes are going to lock up much earlier, perhaps even before the fronts.

Correct me if i'm wrong, but that implies braking instability that has disaster written all over it, even for normal braking when not in a straight line.

If such a thing happens in an emergency then I think the car may become uncontrollable, with all the consequences that would imply, such as LIABILITY and INSURANCE issues.

Bearing in mind that SD1 brakes are quite sensitive to poor maintenance and therefor, such a condition may persuade an owner that he needs uprated braking system rather than ensuring that the existing system is operating at peak efficiency

For a regular road-going vehicle in our modern motoring environment I am doubtful of the benefits of creating an unbalanced braking system.

Moreover if the motive for adding rear discs is purely cosmetic, then it also figures that attending to the real issue might take second place.

For my sins I wrote the following analysis of the SD1 braking system which attempts to address all the maintenance issues and also bears close scrutiny before anyone gets hurt.

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Disc brakes for the win! I always use the comparision that why the hell does my MG have rear discs and 200 has drums if the drums are "aquedate"...

5000SE wrote:

Quote:

– the advantages lie in weight saving, maintenance and heat dissipation

I'll agree with the maintenance part for a start...just changed my rear shoes and cylinders (one leaking and cost less than £6 each,what the hell,assume they were fitted in pairs last time). Instantly reminded why I've bought cars with rear discs for the last couple of years ( also cars that aren't lowered right to the ground as well ), not a very fun job and why does one cylinder feed across to the other??? mine was leaking on N/S/R and feeding air across to O/S/R as well .