Rover SD1 Brake Calipers

frankman · Postby **frankman** » 09 Oct 2007 19:37

is it possible to bolt the Rover SD1 4 Pot Calipers direct on

or is the whole distance different (82,5mm TR7 original)

if this will match could I use some TR8 Disc's

http://www.rimmerbros.co.uk:80/rimmer/r ... dia/brakes

Thanks for some assistance

Hello from Switzerland

Frank

UKPhilTR7 · Postby **UKPhilTR7** » 10 Oct 2007 07:30

I really do not know the answer to this one, but I sure would like to know. I too would like to update my front breaks and if you can do this, it would be great. I have the original 13â€ alloy wheels on my girl and am not sure if they would fit on there. In saying that though, I would have thought that Rimmer would have taken this chance to sell more things like this to us poor TR7 drivers, if they though they would fit.
I do like the look of the new break servo though, does anyone know if this would fit on the TRâ€™s?

frankman · Postby **frankman** » 10 Oct 2007 10:24

Hello Phil .. as far as I know should the Rover SD1 Servo fit but there are some Member who did some conversion ..

What is for shure you can use some Austin Princess / Ambassador 4Pot Brake calipers .. with the TR8 Disc and with Spacer Kit some vented Disc..

http://www.forum.triumphtr7.com/topic.a ... d1%2Cservo

Hello from Switzerland

Frank

Beans · Postby **Beans** » 10 Oct 2007 18:35

Princess calipers do have some disadvantages (to put it mildly)[:p]
Crap dustseals leading to rusty pistons;
Very heavy;
Better to go for some Ford items, relative cheap and more effective ...

<center>

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

Jolyon39 · Postby **Jolyon39** » 10 Oct 2007 21:43

Hi

Yes the SD1 4 pot callipers fit staight on and use a vented disc.

I have a set of Rimmers SD1 Rover brakes with vented disc and spacer to match up the new rotor to the new calliper. You have to install 15" rims though.

Princes callipers work well and can we widened to fit a vented disc. The only off the shelf spacers I have found for this calliper are 8mm from

http://www.rallydesign.co.uk/catalog/pr ... s_id=10503

The original Princes calliper is 13mm so the additional 8mm makes a max width of 21mm for the new rotor

You can also fix the problems of the original Princess Calliper by purchasing the following new, alloy Princess callipers, available in a variety of widths and colours. They bolt straight onto our cars with a single inlet pipe too.

http://www.hispecbrake.co.uk/calipers/b4pri-page.htm

Jolyon

UKPhilTR7 · Postby **UKPhilTR7** » 11 Oct 2007 08:04

WOW I like the new ones that you can buy for the TR7, I have got to get my hands on a set of them, just need to talk the wife into buying me a set for Christmas. I would like the red ones, but think for the reduction in cost, I could live with the silver ones. I had a quick look and on the site I could not find anywhere to contact Hi-Spec Motor sports, but think I will have to have a greater search on the net for that, but this is great. Jolyon can they be used with the original 13â€ alloy wheels and have you done this?

Jolyon39 · Postby **Jolyon39** » 11 Oct 2007 09:14

I have not used these, the cost of shipping to NZ would be HUGE.

They would require 14" or 15" rims because I believe that the original Princess callipers need this. Someone please correct me on this.

Contact details are:

By post:
Hi Spec Motorsport Limited
Unit 7 & 8 Parker Industrial Centre
Watling Street
Dartford
Kent. DA2 6EP
England

By telephone: 01322 286850
01322 286827
By fax: 01322 286851
08700 518754
By email: sales@hispecmotorsport.co.uk

Bendder · Postby **Bendder** » 11 Oct 2007 15:56

Yes the calipers bolt straight on. I am using them on my V8 although I am using the whole bottom end of the rover strut and going with five stud and also the wider drums from the SD1 on the rear. I did check though and yas they will bolt right on the TR7 strut also. You will need to remove the spacer(washer) from between the caliper and steering link as the caliper mounting flange is thicker. As far as the TR8 rotor goes I'm not sure that it would work I think it is a smaller dia. I don't have a TR8 one to measure but the SD1 rotor is 10 1/8" dia. You would need the calipers for non vented SD1 series one though if they were the same as TR8 are non vented. They are bigger than a princess caliper and all I can say is that when I put them on my SD1 it made a huge difference and that is amplified even more so when used on the TR7 as it's some 800lbs lighter. Coupled with a drum/shoe combo that is a full 1/2" wider at the rear (rear disc is nice but this is a far more cost efective upgrade although you have to go to 5 stud) Keep in mind also that the master is not the dia bore as TR7 7/8" vs 3/4" and the piping is on the opposite side of the master. The SD1 non vented 4pots will fit in a 14" rim not sure if going vented makes any difference as they are the same dia. but I know from experience there is not much room between the outside of the caliper and the back side of the rim/wheel.

Mark
1977 TR7 FHC
1978 TR7 FHC
1980 TR7 DHC
1980 Rover SD1 4.0L

Beans · Postby **Beans** » 11 Oct 2007 18:57

Revington TR do various bolt-on upgrades for the TR7 using Hi-Spec calipers. Not cheap but than you get what you pay for ...
And they are much lighter then the Princess caliper and fully dust sealed if you choose the right ones.

<center>

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

UKPhilTR7 · Postby **UKPhilTR7** » 12 Oct 2007 11:25

Bendder, thanks for this reply. From what I can make out it the SD1 calipers would fit on the TR7 struts as a direct bolt on with a little spacer removal, but they would only work with 14â€ wheels not the original 13â€ ones that I have got lol, there is always something to burst my bubble. After buying a new set of 13â€ rims, I think I will have to look for another alternative to the old TR7 front breaking system

FI Spyder · Postby **FI Spyder** » 12 Oct 2007 19:52

If you want to keep your 13" wheels because of originality or whatever there are things you can try. Replace all rubber brake hoses with new ones preferably braided ones. Rubber tends to expand with time narrowing the inside diameter. Braided brake lines won't expand as much as rubber ones giving a somewhat more solid feel. Use Green Stuff brake pads. They have a higher coefficient of friction plus have less brake dust. Cross drilled discs are available. An uprated brake booster is available to apply more force. The brakes may not have tire screaching stopping power but neither does my Integra or Toyota. Remember if your tires are sliding/screaching on pavement you are not getting maximum stopping power and also have lost steering control.

frankman · Postby **frankman** » 13 Oct 2007 16:58

.. He Thanks for your responses - so the SD1 need 14" and Up wheels the

Princess Caliper work with 13" (Princess/Ambassador uses 13") ..

@ Beans yes I know there is much more effective brake systems ..

But a friend of mine would like a "legal" improve for the car, so that he can examinate " Brake and wheels
.. we can examinat the car at (DMV/TÃ¼V Mot) for 6 Years - if the car is original, collectable and 30 Years of age .. Otherwise !! ;-)

.. the SD1 Calipers are at Rimmer only Â£50 so a good Price?
http://www.rimmerbros.co.uk/rimmer/rove ... dia/brakes

Hello from Switzerland

Frank

Beans · Postby **Beans** » 13 Oct 2007 17:34

I know there are some odd TÃ¼V rules regarding brake upgrades in Germany. Which means you are not allowed to change the standard brakes unless the brakes you are going to use they have a TÃ¼V certificate. So here's the good news, Hi-Spec now have German branche (http://www.hispec.de) They should be able to help ...

If you use Ford (AtÃ©) calipers thje ones with tow opposing Ã¸54mm pistons you will have a caliper with decent dustseals which is more effective then the SD1 ones and is probably cheaper. And plenty of choice for pad material ...

These are on my DHC at the moment, bolt straight onto a TR7 upright

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

Bendder · Postby **Bendder** » 14 Oct 2007 01:34

Beans,

I am not familiar with that particular caliper but in what way would they be better than the 2 pot SD1 caliper? The 2 pot sd1 has a piston size of 57mm x2 and bolts straight on also(+/- a little bit, it's hard to get the caliper to measure in there) and the 4 pot has a piston dia of 48mm x4 +/- a bit not to mention a bigger pad. I truly do respect your opinion don't get me wrong but would bigger not be better? Does anyone know the dia of the stock TR8 rotor? as compared to the SD1 @ 10 1/8"?

Mark
1977 TR7 FHC
1978 TR7 FHC
1980 TR7 DHC
1980 Rover SD1 4.0L

Jolyon39 · Postby **Jolyon39** » 14 Oct 2007 05:45

Taken from my post on Soft Brakes Topic

Piston Diameter stuff:

Here is part of a spread sheet I have made up covering piston diameters. First column is the calliper known by the car we take it from, second is the dia of each piston, third is the number of pistons and final is the culmulative total of piston surface area in mm2 used to exert force in a calliper.

TR7 51 2 4086
TR8 54 2 4580

Princess 38 4 4536
Volvo 38 4 4536
Capri 54 2 4580
Hi Spec Motor Sport Ver 1 38.6 4 4681 (supplied by Revington TR)
Hi Spec Motor Sport Ver 3 41 4 5281 (supplied by Revington TR)
Rover SD1 Vitesse 41 4 5281

NB: The Capri and Volvo is pretty much the same as a genuine TR8 calliper.

This of course does not take into account the extra leverage you get when you stop a 256mm dia rotor versus the 240mm rotor. The radius or leverage is longer therefore more force is exerted that way as well. I am not an engineer and would enjoy someone adding precise maths to all this data.

Rotor Diameter does make a huge difference to stopping

Anonymous

Rover SD1 Brake Calipers

Rover SD1 Brake Calipers

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