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MG MGB Technical - Rear axle brake pipes

I am rebuilding a 75 mgb roadster and the PO had fitted the dual line brakes from the latest level. I bought a copper brake pipe set but found that the 2 pipes that run along the axle don't fit. The long one is too short and (you've guessed it!) the short one is too long. Did MG move the 3-way connector along the axle about 2" when they changed to dual line brakes?
J Tampkins

It's quite possible. I can't say for sure but the latest models went from 6V batteries to 12v & the mounting bracket for the 3 way connector is bolted to the battery cradle.Is it possible to move the mounting bracket to suit your current set up? Barrie E
Barrie Egerton

Barrie,

Thanks for the input but surely the 3-way is mounted on the welded tag on the axle casing with the flexible pipe going into the 3rd hole?

john
J Tampkins

John, Having just upgraded my CB car to dual circuit brakes, I have identified that the mounting on the rear axle for the 3 way union is much closer to the diff than on the later cars, hence your pipe length problem.

You can get earlier pipes for the rear axle, or (as I did) weld a new bracket on the axle where the flexi and the copper pipes meet.

Cheers,
Andrew
Andrew

I have an 80LE and replacing the brake pipes as well due to crushed points in both pipes from towing or such by a PO. I've looked at Moss' pipes (not pre bent) and opted to have them built by a local brake company. The 3 way connector attaches to a bracket welded to the passenger side of the axle a few inches from the differential housing. Some auto stores carry standard pipes with "british" ends, but the lengths I found were all in increments of 10 inches. Thus, similar results to yours. A rough measurement of my old pipes comes to about 24 inches for the passenger side and 38 for the driver's side. My new pipes should be ready today. Hope this helps.
Rick Penland

Thanks all for your comments.

Andrew, I have spoken to the company that supplies the kits and they are going to supply the old level rear axle pipes to solve the problem. I have also found out from them that the master cylinder threads are metric on the dual master cylinder hence 3 of the pipes have metric threads at one end and imperial at the other.

John
J Tampkins

John,

Can you help me please? Has the connector under the seat in the line to the rear got different threads in each end? Mine (from Moss) appears to have same threads and the pipe to the rear will fit in, but the pipe from the master cyl will not !

Is it the connector or pipe from master cyl that is wrong?

Thanks,

Andrew
Andrew Walton

Oh no! I've just taken this connector off my 76 BGT, before taking the RHS floorpan out. Is this connector (a hexagonal tube taking a brake pipe connector at each end) a standard part? Should it really hang loose in the air? I had assumed it was a bodge from some previous owner! I will have to dig deep into my scrap bin and see if I can find it.

Mike
Mike Standring

The dual system with servo does seem to have a hex connector in the middle of the run from front to rear. The single line and non-servo dual line systems don't seem to have that. Presumably the pipe is supported quite close to it.
Paul Hunt

The connector was between the front of the floor pan and the first crossmember. It was supported by the rubber pads with the metal plates which also support the wiring loom, fuel lines etc. which run from front to rear. I suppose this was sufficient support but it still looked like a bodge job!
Mike Standring

All my B's with dual line circuit have this connectors. There is no difference between servo and non servo systems. May be the MK I B's did not use it?

If the original bras connector is lost, there is a refabrication of galvanized steel available from Moss.
Ralph

This thread was discussed between 09/02/2009 and 25/02/2009

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