Thread: Brake problems - gurus needed!

you should be able to change out to a disco MC. (even if you need to custom fab the tower/mounts This is how I would go as then you maintain the correct mc/slave relationship, actually Id copy the entire disco brake system at the end of the day)

you can blank off the unrequired ports on the rangie MC but you need to be careful to blank them off in such a way that you allow flow through both the primary and secondary brake circuts otherwise you could get some entertaining braking action.

I dont have the schematic in front of me ATM and since I dont normally do rangies will have to dig for one in RAVE (if it goes back that early) I dont have any paper based rangies books I can research. I'll post again if rave shows anything.

Ok check out the pic...

what you want to do is this (to reuse your range MC)

remove and blank off the lines from the secondary side of the system after the tpiece that in the schematic is attached to the biasing/protection valve and route the primaries directly to the front brake cylinders, thats it your done for doing the spannering

now take it to an engineering shop cause you've just changed the braking system for your vehicle and get an engineers certification for a mod plate, get the mod plate, get the insurance company to sign off on it and in some cases go through the registration process again so that the RTA (or equivelent) is aware of the modifications to the vehice (may not be required but always best to find out from them).

cheers

I have done a few Disco to early classic changeovers, And found it is an engineering requirement in most states to retain the original braking system the vehicle was manufactured with.
The way to retain the RRC braking system is to run a 10mm drill through the mounting holes in the RRC original brake calipers(Which are 3/8" holes, and use 3'8"unf bolts), and then you can use the Disco 10mm metric mounting bolts. You then end up with Imperial RRC calipers attached to Disco metric axle housings. The RRC disc offsets are the same as a D1, and line up perfectly.
The only problem exist when you want to go to vented front discs/calipers, this requires a caliper spacer kit to retain the early RRC twin circuit caliper, or find a pair of 1990 on RRC Vogue calipers, stubs, hubs and discs etc and graft these to the end of the D1 swivel housings.

JC

Your MC is probably different to mine. But on mine the extra banjo fittings simply unbolted, reducing each double port back to a single.

Thanks all. Really appreciate the information and will have another look tonight (what fun!)

It's for a comp car (slow work) so luckily the engineering certification won't be needed.

Will let you know how I get on

Thanks

Tony

Hi Rockrover,

Whichever calipers you end up using have a look here:

Outer Limits 4x4 Board :: View topic - Trouble bleeding brakes?........you won't believe this!

You should have the same (81.....Lockheed) M/C as mine. The thread above details an issue I came across when installing a brand new same M/C.

Can email you the relevant manual if you want. The key diagram is on the next page of what Blknight posted.

cheers.

would love to see the next page mate

tberson@airlandlogistics.com.au

Cheers and thanks

if its for comp work then you can omit the t pieces and the proportioning valves entirely and you will have a 50/50 brake distribution as opposed to the normal 70/30