Ford 9 inch brakes ?

[THE VIKING]

I am putting a 9 inch axle on my my car what i would like to know what are the popular rear disc conversions for these axles ? Will need quite big brakes as It has to stop a 5.9 V8 in a 100e.

[weemark]

you would be better off sticking with drums on the rear, these 9" axles were under 3ton cars and stopped them no probs, a little 100e will be half the weight of whatever the 9" was under originally. putting disks on the rear might cause it to lock up you would then need to add in a brake balance to stop it locking up making the disks as inefficient as drums...

[Alcoholic Rat]

yep, i agree with Mark. We MOT limos,(9" axles) some have drums some have discs, the drum brakes never fail MOT and easily achieve SVA efficiency whereas discs are a nightmare, we all ways have to do loads of work to get them upto spec. Stick with the drums!

[langysrodshop]

Yep drums for me too, Hotrods don't really need rear discs.

[THE VIKING]

If I do keep the drums is there any better looking back plates maybe in stainless or ali to make them look a little better than just the stock Ford items ?

[langysrodshop]

They can be made to look nice with a bit of paint and detail.


http://i65.photobucket.com/albums/h229/stevelangylang/32%20Roadster%20Project/Sept110813.jpg

[THE VIKING]

Those do look Nice steve but a bit over the top for a pro street car Are the wheel cylinders, drums and shoes still avalable ?

[langysrodshop]

Just to show you what a bit of paint can do m8.

You can get cylinders etc etc from most U.S. spares places.


Those do look Nice steve but a bit over the top for a pro street car Are the wheel cylinders, drums and shoes still avalable ?

[THE VIKING]

Well drums it is more £££££££ saved :) just goes to show what a fresh coat of paint can do.

[56Chevynut]

I am putting a 9 inch axle on my my car what i would like to know what are the popular rear disc conversions for these axles ? Will need quite big brakes as It has to stop a 5.9 V8 in a 100e.
I'm using redrilled mercedes discs with Citroen BX front brake calipers, the bx was unusual in that the emergency brake is on the front wheels, the pads have a large surface area and the cable operated emergency brake is self adjusting, the down side is that citroen Bx calipers are getting a little thin on the ground now due to lack of demand! let me know if you are interested in this solution, I can find out which model mercedes the discs are, I can give you a template for the caliper brackets, I even have a spare pair of calipers if you can find the rebuild kits.

[Alcoholic Rat]

Xantia also has handbrake on front calipers. Millions of them lying around.;)

[langysrodshop]

If you use the discs from a W126 Merc you don't need to drill them as they slip straight on.


http://i65.photobucket.com/albums/h229/stevelangylang/T%20Bucket/PICT5470.jpg



I'm using redrilled mercedes discs with Citroen BX front brake calipers, the bx was unusual in that the emergency brake is on the front wheels, the pads have a large surface area and the cable operated emergency brake is self adjusting, the down side is that citroen Bx calipers are getting a little thin on the ground now due to lack of demand! let me know if you are interested in this solution, I can find out which model mercedes the discs are, I can give you a template for the caliper brackets, I even have a spare pair of calipers if you can find the rebuild kits.

[langysrodshop]

And Saab's



Xantia also has handbrake on front calipers. Millions of them lying around.;)

[THE VIKING]

Everything you do Steve has nice attenton to detail. I see on your Rocket project you have used some nice star style bolts in stainless where do you get these from ?

[56Chevynut]

If you use the discs from a W126 Merc you don't need to drill them as they slip straight on.


http://i65.photobucket.com/albums/h229/stevelangylang/T%20Bucket/PICT5470.jpg
That setup looks really well fitted, but shouldnt the brake line be flexi as the caliper moves on sliders to take up pad wear :confused:

[merryknees]

I'am using
Ford Probe discs same PCD as the Ford 9" and BMW mini ali calipers with hand brake cables from Lokar
You may need to turn down the outside dia of your half shafts to allow the Probe hat to clear. I had to BUT that maybe because they are after market Strange shafts.
Custom brackets will have to be fabricated to mount the caliper to but these can incorporate the half shaft retaining bracket.
http://www.hotrodders.com/journal_photos/00019871/11860386140.jpg
http://www.hotrodders.com/journal_photos/00019871/11860386141.jpg

[THE VIKING]

That setup looks really well fitted, but shouldnt the brake line be flexi as the caliper moves on sliders to take up pad wear :confused:

Well spotted Chevynut I think you are right

[langysrodshop]

All the bolts on my car are ARP stainless, I think the one's you are referring too are the 12 point type.



Everything you do Steve has nice attenton to detail. I see on your Rocket project you have used some nice star style bolts in stainless where do you get these from ?

[langysrodshop]

In theory yes but they wear very little being on the rear so therefore movement is nil, Andy Robinson has the the same setup on his racecars. Havn't had a problem in 12 years, and yes i do check.



That setup looks really well fitted, but shouldnt the brake line be flexi as the caliper moves on sliders to take up pad wear :confused:

[langysrodshop]

Ian i've tried the probe discs myself but as you found they need the flange turning down, If you use the Merc discs they slip straight on.



I'am using
Ford Probe discs same PCD as the Ford 9" and BMW mini ali calipers with hand brake cables from Lokar
You may need to turn down the outside dia of your half shafts to allow the Probe hat to clear. I had to BUT that maybe because they are after market Strange shafts.
Custom brackets will have to be fabricated to mount the caliper to but these can incorporate the half shaft retaining bracket.
http://www.hotrodders.com/journal_photos/00019871/11860386140.jpg
http://www.hotrodders.com/journal_photos/00019871/11860386141.jpg

[nobler]

the mercs that may fit are still 112mm pitched circles - not 4.5 inch=114.2mm
they only fit as they use an m14 bolt, whereas the majority of mercs use m12

-why not use a vw golf caliper, as they look similar to the pics

-and what about mazda discs, they are 4.5 inch pcd's

go here
www.speedways.co.uk

-get some calipers with cable doings from a golf
-find out the golfs discs diameter and thickness
-find a mazda disc that fits the caliper, with enough offset to get to the caliper, and the custom bracket give you some leeway
you may stumble on a vented disc/caliper set up even,

for example an edosx 6 disc at 10 inches 250ishmm, vented and 24mm thick = 40 quid a pair, with the correct pitch circle, plu s just one mount hole,

i bety the golf 4 with rear discs, uses a similar sized rear disc 256mm roundy roundy, and 22mm thick = vented

[langysrodshop]

Yes i know that, You can use anything you like but the fact remains that they all will need modification whereas the Merc disc fits without any mods at all. Why make it difficult when its easy ???



the mercs that may fit are still 112mm pitched circles - not 4.5 inch=114.2mm
they only fit as they use an m14 bolt, whereas the majority of mercs use m12

-why not use a vw golf caliper, as they look similar to the pics

-and what about mazda discs, they are 4.5 inch pcd's

go here
www.speedways.co.uk (http://www.speedways.co.uk)

-get some calipers with cable doings from a golf
-find out the golfs discs diameter and thickness
-find a mazda disc that fits the caliper, with enough offset to get to the caliper, and the custom bracket give you some leeway
you may stumble on a vented disc/caliper set up even,

[nobler]

because
golf 4 rear calipers are plentiful
and the discs are cheap
-maybe?
-looking at the probe disc picture, would simmise that they are the same as the mazda ones
-the calipers are probably the same items as the vag golf 4 ones too....


Steve, I do not wish to appear impertinant, its just I have bought lots of merc discs, as I planned on using some s class fronts on a vw van=same pcd
-know the mazda are ford, plus the golf rear calipers are used in the vw world
-sorry!!

plus, while you are on, do you get your wheel studs and stuff from that place in middlesex?
i.e. trade

[langysrodshop]

I pay £18 each for the Merc discs, cheap as chips. No machining charge.

Not sure i know the place you mean ??? Whereabouts in middlesex ?



because
golf 4 rear calipers are plentiful
and the discs are cheap
-maybe?
-looking at the probe disc picture, would simmise that they are the same as the mazda ones
-the calipers are probably the same items as the vag golf 4 ones too....


Steve, I do not wish to appear impertinant, its just I have bought lots of merc discs, as I planned on using some s class fronts on a vw van=same pcd
-know the mazda are ford, plus the golf rear calipers are used in the vw world
-sorry!!

plus, while you are on, do you get your wheel studs and stuff from that place in middlesex?
i.e. trade

[56Chevynut]

In theory yes but they wear very little being on the rear so therefore movement is nil, Andy Robinson has the the same setup on his racecars. Havn't had a problem in 12 years, and yes i do check.
I had a nine inch built by Andy Robinson with this setup and it had aircraft quality braided steel flexible brake lines, just my opinion and with respect, but very little wear means very little movement, not nil movement, and even very little movement could cause a fracture or undue stress on the brakeline.

[chevy2]

done a few disc conversions on 8"-9" axles,
found the best disc is the Merc ones, if you use the factory wheel studs which have a shoulder you need to lightly file the 5 holes on the disc for it to fully seat on the half shaft face, no problems with Moroso studs as they dont have the shoulder,
also if you're using large bearing shafts the centering hole on the disc needs turning on the lathe to fit over the half shaft centre hub,

used Golf calipers, work OK but the mounting bracket fits very near the ends of the axle tubes, you cant use 2 of the T bolts, regular nuts & bolts needed,

Citroen calipers work OK, heard from a Citroen mechanic you need to change the seals to use regular brake fluid, never heard any problems with them though?

I personally prefer using Ford Granada/scorpio/cosworth calipers,
easily available still as most escort guys use them for rear disc conversions.

dont throw away the factory drum back plates as you'll need them to make a spacer from them that goes between the 4 bolt half shaft retaining flange and the end of the axle.

[langysrodshop]

Funny you should mention that but Andy built this axle for my racecar 12 years ago.


I had a nine inch built by Andy Robinson with this setup and it had aircraft quality braided steel flexible brake lines, just my opinion and with respect, but very little wear means very little movement, not nil movement, and even very little movement could cause a fracture or undue stress on the brakeline.