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Post by Deleted on Feb 4, 2006 19:50:28 GMT
hi,can anybody put into layman terms how the servo works? i think i know but would be obliged if someone can comfirm cheers matt
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Post by Phil Nottingham on Feb 4, 2006 20:32:53 GMT
It uses engine vacuum suck the air out of both sides of the big rubber diaphrgm in the servo body - letting air in through the air valve on one side - the opposite side - of the brake cylinder in the servo allows the outside air pressure to help push the cylinder that applies hydraulic pressure to the brake lines. Any stickiness in the air valve or diaphragm (on Girling type as its leather) make the brakes lock on
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Post by Deleted on Feb 4, 2006 21:26:47 GMT
had mine apart again today and replaced the new foam rubber behind the leather with the original one.the spring is pretty strong so would have to be very sticky to lock up ........ no? anyhow if it doesent work after ive bled the brakes tommorow im getting a new one from wadhams matt
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Post by Phil Nottingham on Feb 4, 2006 22:05:00 GMT
Air valve?
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Post by Deleted on Feb 5, 2006 13:27:31 GMT
hi phil, the air valve blows one way from the servo out.thats correct yes? servos out agaain and next time it goes in it will be a new one ! matt
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Post by Deleted on Feb 5, 2006 13:47:21 GMT
i see wadhams are listing 2 in the p5 section an exchange 3 litre unit or a new one used on the v8. the exchange one will fit straight in but do you think im better off getting the new one? matt
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Post by Phil Nottingham on Feb 5, 2006 13:59:07 GMT
I fiited the simpler/cheaper and brand new Lockheed type 7 as used on the V8 its also a P6 and a Land Rover part so its easier to obtain if not exactly "cheap" Do not bother with secondhand ones either as these can be troublesome although the service kits are cheap
As regards the air valve if this sticks even very partially the brakes will be held on. The Girling type is notorious for this especially when not used often - the same can happen with the Lockheed but then its more often the master cylinder free adjustment that causes it - it can of course be this with any brakes - have you checked it? Its best to allow slightly too much than too less
Personally I would not bother with the Girling type
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Post by Deleted on Feb 5, 2006 15:00:31 GMT
cheers phil,i think ill go with the v8 one. if you get a moment would you mind checking out this one on ebay.its new just not sure its the right one item number 4604669462 cheers again matt
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Post by Phil Nottingham on Feb 5, 2006 16:04:17 GMT
It looks the same - although I did not think the boost ratio was that big? 3...something
springs to mind. The Unipart/Partco number on my two I bought was APLLR18231 (Land Rover) This also may be an 8" whereas its definitely the 7 inch one # Its a good price though but also remember that P6's were discs all round so need more assistance and the V8's which did have the 7" servo were lighter at the front
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Post by Deleted on Feb 5, 2006 16:15:35 GMT
guess id be better ordering one from wadhams. i wll need to make a bracket i presume, how did you make yours phil?
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Post by Phil Nottingham on Feb 5, 2006 17:36:45 GMT
Its just an angle off the original - dead easy - posted some pictures the other week but its not very easy to spot with engine/ manifold in. Dead easy though.
Make sure servo has built in non return valve for vac hose otherwise separate in line one has to be fitted. Brake pipes had to be moded slightly as well
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