Was the vacuum hose on the Australian Cooper S engine made by Dunlop?
Hose size 1/2 inch ID 3/4 OD ????
Length for each hose?
Could anybody help with the above questions please.
Cheers.

The hose was changed during MK II production as described in the following technical bulletin. As the old hose had a "criss-cross pattern", presumably like that used on hydrolastic displacers, it seems likely that Dunlop was the manufacturer, and maybe of the newer hose too.

The new hose is part number AYK5419.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Hi Doug
Thank you for that information on the vacuum hose.
I really do like those Technical Bulletin's and interesting reading.
looking into some Dunlop hose at this stage and would like to know what the original length was if anybody has that information.
Do you have a photo of the original hose clamps?
Pete

Pete,

Here are some pics of the brake booster hose on my car. I don't know for sure if it's original but I suspect it is, partly because there are no manufacturer markings on the outside. More modern auto hoses for fuel and water seem to have makers details, McKay Rubber for example.

You can see a sort of criss-cross pattern to the reinforcing layer. The OD is a smidgeon under 3/4" and the length is 38cm.

Each end is fitted with Tridon worm clips, interestingly with Canada marking. I note the vacuum hose and heater hose clips in the Clubman GT crash test photos are also worm clips, so maybe they are original.

viewtopic.php?f=2&t=85906

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Doug those photo's and information will be so helpful to complete the tasks.
Amazing how you come up with these! and noted the hose length thanks.
I also noted the plug lead caps on the Clubman GT. Hoping to find some.
Cheer's Pete.

Pete. The hose looks like it's been hacked at each end, presumably to clean it up when a new booster was fitted. It looks a bit tight as well so I'd say it should be a bit longer.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Sorry to hijack the thread but my question is about the connectors used at each end of the hose. Did aus built cars have a one way valve in line and if so was it on the inlet manifold or on the booster ?
I have searched cars other than Coopers that had a booster fitted to try and locate a replacement. I know English mk1 had one fitted but the only replacement is an inline valve from Mini Spares but it has 3/8" spurs not 1/2'. I cant find anything definitive re aus built mk1

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Mk1 Cooper S
Mini K Rally car

The Australian assembled Mark 1 and some early MK II Cooper S's used a Lockheed brake booster, replaced by the locally made PBR VH44 booster in 1969. Both boosters have a non-return valve fitted to the body, with a simple adapter (no valving) on the inlet manifold.

Assuming yours is a Lockheed booster the non-return valve is item 75 in the following parts list.

For the VH44 you can see the big white plastic non-return valve in one of the crash test photos I linked in a post above.

Does that answer your question?

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Just a bit of trivia, but remember the recall on PBR non return valves. It was across all manufacturers that fitted PBR Boosters.

1. Lockheed boosters had a non-return valve fitted to the booster - as Winabbey has said. This allowed air to flow FROM the booster TO the manifold to create a vacuum in the canister.
There is/was a valve available new (17H2646ORIGINAL from Mini Spares UK) that looks similar to the originals, but they fit on the manifold and work in reverse to the booster valves. If you were to fit this valve to the booster where they were fitted to Oz Ss, it would not work. I am told that some booster set-ups on UK cars used this reverse arrangement.

2. I have several of the old valves but they are all faulty. I intend to fit one to the booster for appearances but fit an in-line valve inside the hose where it cannot be seen as most modern cars do. These in-line valves are from Mitsubishi and cost $5.

Hi Doug
That answers my question
Thanks to all who contrubuted

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Mk1 Cooper S
Mini K Rally car

Hi Bill
If you can put up with changing the hose to 10mm and the and machining up suitable connectors, you can use the replacement one way valve from mini spares. This is what I did to get it going and included turning up the connectors - Hours of work
Your solution solves all the problems and I will now redo it with the Mitsubishi in line valve > The car is an English Mk1 that is being built as a pedants replica of the 1966 Geneva rally car so I am now able to visually make it look right
Many Thanks

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Mk1 Cooper S
Mini K Rally car

The Mini Spares one-way valve that sits as a visible joiner in the vacuum line does look clunky.
The Mitsubishi valve p/n is "MR475124 - Hose - Brake Booster". It comes with a short section of 11/32 inch hose. The valve may have to be sleeved somehow to make a tight fit in a 1/2 inch mini vacuum hose.

Bill
Thank you for that- I cant find a suitable valve on ebay. There is one for an Alfa that looks identical - its NOS and for sale at about $50. but metric thread
I am off to Mitsubishi
Chris

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Mk1 Cooper S
Mini K Rally car