24 replies to this topic

[LX 0076]

I need to replace my existing booster (VH271) and master cylinder(P7210) on my early 76 LX. I have a bw diff with vr disc brakes and HQ brakes up front. System has worked perfect until booster master issues. I have decided to remove the proportioning valve by going the Commodore booster/ Ford master cylinder for the A9X look. After searching the forum and looking at the sticky by rorym in the brake section I want to check on booster / master part numbers and make sure I am on the right track. So Commodore booster will be a VH512 DD unit and the Ford master is a P10050. I know I will need to replace some fittings and lines but that is all good as I want to tidy this as I go. Anything I am missing E.G. new brake warning electrical connection ?

Thanks Jayson

[dattoman]

Does your car currently have the black single pin or the brown double pin switch on it ?

 

If its the brown one... plugs straight onto the Ford master

[LX 0076]

Thanks for helping out Datto.

My proportioning valve has a single bullet style connector. A single brown wire runs to this terminal.

Do I have the correct part numbers for the booster and master?

Jayson

[dattoman]

Part #'s are correct

You will have to wire the switch differently though

[LX 0076]

Ok cool, thanks. Any info on what needs to be done electrically? 

Thanks Jayson

[dattoman]

http://www.gmh-toran...ltr-conversion/

[LX 0076]

Champion. Thanks heaps Datto.

[LX 0076]

Have been taking a few measurements and I am concerned about valve cover / booster clearance. I have roller rockers and tall valve covers. I only have about 20 mm to existing vh 271 single diaphragm booster atm. Does anyone have measurements of a vh 512 dd booster. Would it be a better bet to get my existing booster rebuilt with a commodore front to take the falcon master by someone like hydraboost ? 

Jayson

[dattoman]

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[Uncle Chop Chop]

So Neil I assume you would have similar diagrams for any/all HQ-WB and LH-UC boosters as well? It would be really handy, as we're going to be running a P5489 master without a booster.

[LX 0076]

Thanks once again Datto. Your help is outstanding, I really appreciate you taking the time to help me out.

Jayson.

[dattoman]

So Neil I assume you would have similar diagrams for any/all HQ-WB and LH-UC boosters as well? It would be really handy, as we're going to be running a P5489 master without a booster.

 

I have a PBR mastervac catalogue

Infact... got a few catalogues... but not all have pictures with dimensions

 

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[LX 0076]

I have been ringing suppliers for parts to do this conversion. I am still leaning towards doing it this way but a very reputable brake supplier has told me he can supply me a vh319 with a p10050 master cylinder. He tells me this will bolt straight up but i will have to re drill my auto brake pedal, (currently straight rod from booster). All up $600 for everything new/reconditioned. I am not really sure about this but he is very confident and has told me he has done a dozen torana's like this. I didn't think re drilling a brake pedal worked. Surely the falcon booster does not bolt up? 

I have not named the supplier because I believe they are very reputable and well known but this info just does not sit right in my head. Any ideas / experience using these parts.

 

Cheers Jayson

[dattoman]

VH319?

[LX 0076]

Maybe I stuffed up and he said VH329? That would mean he would be changing the front of the booster i suppose? Still supplying a bent rod booster and my pedal is for straight rod.

[dattoman]

A VH329 is a straight rod booster---- originally

Yes he may be modifying the front can for the diagonal bolt master

[neglectedtorana]

I have what I think is a Torana DD booster that I had a VN front fitted to and have the 10050 MC on, I am fitting an LS1 and the length of the booster from the MC has been annoying me for a long time so I am going to swap it for the VN DD to give more clearance around the valve covers for the coils and maybe run the heater hoses past it.

 

I use a guy in Sydney called 'Auto Brakes' 97484944 he is supplying my new/rebuilt booster for $260 +gst with the bent Torana push rod to suit my car.

His workshop was a dark dungeon last time I went there but it was full of collected brake parts so he may have the bits you want.

 

When I get my new one you would be welcome to try my current one and see if you like how it fits before you decide if you want to order the VN booster

 

From the pics I have seen on here I think the VN and Torana are the same diameter just the VN is not as long so does not protrude as far forward from the firewall

 

Cheers, Tom

[LX 0076]

I have what I think is a Torana DD booster that I had a VN front fitted to and have the 10050 MC on, I am fitting an LS1 and the length of the booster from the MC has been annoying me for a long time so I am going to swap it for the VN DD to give more clearance around the valve covers for the coils and maybe run the heater hoses past it.

 

I use a guy in Sydney called 'Auto Brakes' 97484944 he is supplying my new/rebuilt booster for $260 +gst with the bent Torana push rod to suit my car.

His workshop was a dark dungeon last time I went there but it was full of collected brake parts so he may have the bits you want.

 

When I get my new one you would be welcome to try my current one and see if you like how it fits before you decide if you want to order the VN booster

 

From the pics I have seen on here I think the VN and Torana are the same diameter just the VN is not as long so does not protrude as far forward from the firewall

 

Cheers, Tom

Thanks for the info Tom, I unfortunately live about 6 hrs from Sydney so probably not able to take you up on your offer of a trial fit, but thanks heaps for the offer mate. I will call your guy and see what he can do. 

Cheers Jayson.

[neglectedtorana]

if you want I can post pics when I receive mine and it might help you decide

will be a few weeks

[LX 0076]

Pics would be appreciated. Thanks Tom.

[neglectedtorana]

Got my VN booster and fitted it, much smaller and takes up a lot less room than the Torana booster I had which could have been a VH329

I kept the VN master cylinder and re-bent 2 of the pipes but will have to replace 1 to reach the master cylinder as it is now closer to the firewall.

 

Hope pics help

top is new VN booster

mid is VH329 with VN front

not is VH329 and original master cylinder

 

Cheers, Tom

 

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[LX 0076]

Thanks Tom, I have got myself a vh dd booster and adapted rod to suit my pedal. I am using the P10050 ford master for the a9x type look, which leads me to my next question. From the sticky on this topic, booster push rod needs to be flush with face of the booster. When i measure the mounting face to internals on brand new master i get 1.75 mm that the booster push rod needs to be reduced as to not load the master which will obviously make push rod shorter than flush with booster. Am i correct or do you not worry about 1.75 mm. Does the ford master need this small difference? Sorry if this is a stupid question but I don't want to cut booster push rod to find it is now to short.

Thanks Jayson.

[LX 0076]

So after a bit of a web search the gap should be about 20 thou between push rod and master internals. Sound right?

Jayson

[neglectedtorana]

Don't know Jayson,
I trusted the brake guy to set the length, have nit finished the last pipe so also haven't filled and bled it.

I do vaguely recall the brake guy saying it had some preload so maybe it does push on the master cylinder but I don't know and can't 100% recall