drum to disc sorted. now the rear please

farkamhall · Post by **farkamhall** » Sun Oct 28, 2007 6:29 pm

hi all, using the great advice from the guys who answered my previous post,many thanks all, i have managed to get UC torana stub axles with everything attached,radiator, brake booster etc for the front end of my fb.now i need some more help, what can i do with the diff and rear brakes to make them disc brakes as well.cheers

Thommo · Post by **Thommo** » Sun Oct 28, 2007 6:51 pm

You could fit an early volvo diff,
complete with disc brakes & early holden stud pattern.

farkamhall · Post by **farkamhall** » Sun Oct 28, 2007 6:59 pm

thanks thommo, do you mean the early volvo diff already has disc brakes and early holden stud pattern and will fir straight up? also, what year volvo and what model.thanks

Thommo · Post by **Thommo** » Sun Oct 28, 2007 9:00 pm

Yes they share the same bolt pattern, and come with disc brakes.
I do know that much

Has any forum member fitted one?

farkamhall · Post by **farkamhall** » Sun Oct 28, 2007 9:05 pm

thanks thommo, i will take a look into it.any idea what year or model volvo?

Malcolm · Post by **Malcolm** » Mon Oct 29, 2007 12:09 am

Hey farkamhall,

As Thommo said about the volvo diff, you should only have to weld springs saddles onto the diff as per original diff then make brake pipes to match up with FB pipes. Not sure about handbrake though. Only other thing to modify that I can see is the tailshaft.

Cheers

Post by **Blacky** » Mon Oct 29, 2007 8:32 am

Getting the right ratio is the trick with Volvo diffs, a lot of them are 3.9:1
I think the ones out of a 264 model are the best with a ratio of 3:45 or thereabouts.

If you have torana brakes on the front , why not fit torana brakes on the back ? UC toranas had rear discs as an option

farkamhall · Post by **farkamhall** » Mon Oct 29, 2007 9:18 am

would the torana diff fit the fb if i went with the torana discs on rear,if not, what would i do.

stinky · Post by **stinky** » Mon Oct 29, 2007 12:02 pm

Is the car built for cruising or performance?
If you are only going to be cruising it, the easiest thing to do is replace the rear brake cylinders with ones suited for a disc front(smaller bore) and leave it at that.
If you are going to track days or like to take the car around the windy stuff then go disc rear.

farkamhall · Post by **farkamhall** » Mon Oct 29, 2007 1:28 pm

thanks all for the info. Stinky, doe you mean i can just put the disc brake cylinders onto the old drum rear brakes and that will do it? sorry if i sound dumb but i am.

stinky · Post by **stinky** » Mon Oct 29, 2007 11:26 pm

You need to replace the existing wheel cylinders with ones that suit a disc brake front end. They have a smaller bore than ones you probably have now and if I remember correctly the pads will need replacing too as the new wheel cylinders will have a nub (short rod) as opposed to the the longer slotted rod you have now.
If you don't swap wheel cylinders the rears will lock up at 1/4 to 1/2 braking force.

Below is a picture of the drum/drum rear brakes. The slots that the arrows point to are not on the disc/drum brake shoes.
Any decent brake shop or parts store should be able to help you with parts.

farkamhall · Post by **farkamhall** » Tue Oct 30, 2007 9:43 am

thank you very much stinky, really great advice and pic.cheers.

vintageholden · Post by **vintageholden** » Fri Mar 14, 2008 9:10 pm

vovlo 240 1978
i have used on my eh holden
have rear disks and lsd
cost me $150 from the paper here in perth

fbekholden.com