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Jan 25, 2007 20:26:08 GMT
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Another possibly stupid question  Can a master cylinder from one car be used on a completely different car? Say it had it right number of outlets (or even too many and a blanking plug?) and was a similar physical size. Are the mounting holes for where they bolt to the servo generic? They look to be pretty much the same on all master cylinders. Would it be possible for a master cylinder to be too powerful??? Reason for considering this it that I think the brand new master cylinder I bought for the Viva has gone up the swanny  (not sure why either ) and I was thinking it might be easier and cheaper to buy a genuinely brand new one as in more modern, produced more recently. Any thoughts people??? Sorry for rambling on there lol |
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Jan 25, 2007 20:31:16 GMT
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there are subtle differences mate, tried a new one on my dolly (duel line) and leaked everywhere.
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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Jan 25, 2007 20:46:19 GMT
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The important issue will be the bore of the cylinder. If you fitted one with the wrong bore the relationship of brake pedal movement to braking force could go all pear shaped. Is it single or dual circuit brakes? Is there a servo? The common single circuit girling master cylinders are available in several bores and are all the same bolt fitting. I'm not familiar enough with Vauxhalls to know what kind of thing you've got.  Edited to add: What is the problem with the one you've got? You may well be able to rebuild it if the bore is OK. |
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Last Edit: Jan 25, 2007 20:47:29 GMT by Seth
Follow your dreams or you might as well be a vegetable. |
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Jan 25, 2007 20:51:26 GMT
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Theres numourous differances tbh ranging from major design differances (slingle line, dual line, digaonal split, front rear split etc.) Differnt bores, Different outlets, differant threads (M10 or 3/8unf, differant mounting holes, even differnt stroke lengths. Better off finding a viva one. |
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Jan 25, 2007 20:51:58 GMT
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The important issue will be the bore of the cylinder. If you fitted one with the wrong bore the relationship of brake pedal movement to braking force could go all pear shaped. Is it single or dual circuit brakes? Is there a servo? The common single circuit girling master cylinders are available in several bores and are all the same bolt fitting. I'm not familiar enough with Vauxhalls to know what kind of thing you've got. Edited to add: What is the problem with the one you've got? You may well be able to rebuild it if the bore is OK. you got much sperience with triumph brakes seth? |
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Jan 25, 2007 20:53:31 GMT
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need a single line girling triumph dolomite one if anyone has one spare?
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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Jan 25, 2007 20:54:06 GMT
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you got much sperience with triumph brakes seth? Plenty of experience with single circuit, non-servoed ones, yes. Not sure if that helps you hugely though. Tell us whats up in a PM or new thread |
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Follow your dreams or you might as well be a vegetable.
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Jan 25, 2007 20:55:58 GMT
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will do seth, sorry for the hijack
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Jan 25, 2007 20:58:11 GMT
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It's currently got a lockheed master cylinder and a servo, the master cylinder is supposed to be brand new but maybe it's not the correct one? When you say single or dual circuit brakes I'm not sure if I know the difference  It has three brake pipes coming out of it, two of them go to the front calipers (disc brakes at front obviously) and one goes to the rear brakes (drums) Does that make it single or dual circuit? I don't really feel confident rebuilding it to be honest as I'm sure it would go tits up, the Viva owners club has them new for £45.00 so I may try one of them first. I didn't know about the club when I bought the first one and it was more than £45.00  Cheers for help so far Ps Russell sounds like you have my luck with brakes too, I don't know why but I have an irrational fear of brake systems they always seem to break  on me. |
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Jan 25, 2007 21:10:08 GMT
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Nah where mine has been sat for 20 years all the lines have coroded to dust and my servo unit was fooked, rusted through!
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Kris
Posted a lot
Posts: 1,631
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Jan 25, 2007 21:17:59 GMT
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Sounds like a single circuit setup to me, the rear line will split at a T-piece to each of the rear brakes.
When it come you brakes you really can't mess around, £45 isn't too bad for peace of mind IMO.
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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Jan 25, 2007 21:49:21 GMT
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It's currently got a lockheed master cylinder and a servo, the master cylinder is supposed to be brand new but maybe it's not the correct one? When you say single or dual circuit brakes I'm not sure if I know the difference It has three brake pipes coming out of it, two of them go to the front calipers (disc brakes at front obviously) and one goes to the rear brakes (drums) Does that make it single or dual circuit? Well, if all three pipes are coming out of the same place on the cylinder and look like they come from the same chamber then it is probably single circuit. But if the front ones come out in a different place to the rear one then it could be a front/rear split system. This means that should you have a failure at one end you'd still have brakes at the other. I think most cylinders are actually pretty simple. Its only a piston in a bore with a few rubber seals and a circlip or two. You just need to keep track of what order you took the bits off and which way round they go. Digital cameras make this sooo much easier. If you do re-build it you need to ensure that the bore is in perfect condition with no pitting - and you can't use wet 'n' dry to make it so!  That's what this place of for, not just looking at pictures of awesome Aussie campers and bizarre J-tin |
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Follow your dreams or you might as well be a vegetable.
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Jan 25, 2007 22:41:08 GMT
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They can, but as already said there are to many variables that affect what you can and can't use safely. Not worth the effort or risk. Saying that, I run a Land Rover Defender 90 M/C on my Celica.  Clicky |
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I had a right mess on my hands when I tried to use a FE Venotra master cylinder on a FD... Bah lambs... Looks the same is not the same. Also beware of gits who switch from imperial to metric threads part way through production run, these will leak unles you change the unions.
However, Newark Autojumble is a good bet for a M/C. Theres a stall in the main hall bit, usually second rom top end by the burger bar. He sells loads of master cyls, gasket sets, water pumps, etc. thats all he has on his satll. His prices are very good. I've bought loads of stuff from him and I got a couple of FD master cyliners for liek £15 off him. Bargain. Make sure you take the part number or the old MC with you as being a Vauxhall there are bound to be two or more options for you car which will be incompatible.
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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as an example early sierras have two different master cylinders that look identical except that one is for a car with rear drums and one is for a car with all round discs, if you fit the drum brakes one to an all disc car, you get way to much pedal travel as the rear discs need more fluid moved than the rear drums so the internals are different.
if its a standard car i'd fit the right one (be tempting to look into fitting a dual circuit set up, we did it to our mk1 escort and its not very complicated and much safer) if its modified i'd be looking at a bias ajustable set up so you can tinker with it.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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Jan 26, 2007 10:33:29 GMT
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IIRC a mate of mine has a Pug jobby on
his mk2 polo, that's running a 'rocco servo
on a custom built kit though, all his own work.
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(not sure why either 
It has three brake pipes coming out of it, two of them go to the front calipers (disc brakes at front obviously) and one goes to the rear brakes (drums) Does that make it single or dual circuit?
on me.
