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#Post#: 99494--------------------------------------------------
remote servo on Series ii
By: chrismpw Date: October 25, 2015, 8:04 am
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Hello chaps (and chappesses)
My series 2 is behaving oddly - it idles badly and cuts out on
braking, and the servo assist is ... erm ... intermittent. I
suspect the remote servo diaphragm may be leaking.
I have been looking at replacement units available for MGBs on
ebay and am wondering if there is anything more that i have to
consider other than physical fit.
I have no idea of the actual make of the servo that is fitted.
Below is a a link to a picture of my existing remote servo
HTML https://dl.dropboxusercontent.com/u/17357174/brake%20servo.jpg
I'd welcome any opinions or advice, ta.
Chris
#Post#: 99556--------------------------------------------------
Re: remote servo on Series ii
By: spitfiremk1uk Date: October 27, 2015, 2:20 am
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Diameter and stroke of the cylinder are mega important.
Personally I would junk it all and go back to a standard landy
system even if it was non servo assisted.
The standard series 3 servo assisted system can only be
described as awsome! And even non servo assisted 109 brakes can
easily lock up the wheels unless you carry a very heavy load.
88 Brakes are a little less effective but even in non servo form
they can litarally stand an 88 on its front wheels and put a lot
of air under the rear wheels.
If your brakes do not behave like this then you have something
wrong. And I would put the time and effort into fixing the
brakes rather than anything else.
#Post#: 99571--------------------------------------------------
Re: remote servo on Series ii
By: fv1620 Date: October 27, 2015, 5:18 am
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"I have no idea of the actual make of the servo that is fitted.
"
It is a Clayton Dewandre 701686. The repair kits are:
Minor repair kit 701865
Non-return valve kit 700966
Poppet valve kit 700986
I doubt that you will find those. I repaired mine from a NOS one
I had on the shelf.
It was a standard fit for early Shorlands
[URL=
HTML http://smg.photobucket.com/user/fv1620/media/Shorland/20150325_115006%20Medium_zpsfl1zlwgp.jpg.html][IMG]http://img.photobucket.com/albums/v684/fv1620/Shorland/20150325_115006%20Medium_zpsfl1zlwgp.jpg[/img][/URL]
#Post#: 99578--------------------------------------------------
Re: remote servo on Series ii
By: GlenAnderson Date: October 27, 2015, 8:01 am
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It should be as simple as swapping one for the other. I've a
generic modern 1.9:1 boost ratio one from an MG specialist on
eBay. It works well.
With drum brakes you want around the 2:1 boost ratio mark. With
discs about 3:1.
#Post#: 99667--------------------------------------------------
Re: remote servo on Series ii
By: NoelC Date: November 1, 2015, 1:18 pm
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[quote author=spitfiremk1uk link=topic=9499.msg99556#msg99556
date=1445930456]
Personally I would junk it all and go back to a standard landy
system even if it was non servo assisted.
[/quote]
I'd entirely agree. My '66 109" had a Girling Powerstop 6209
remote servo fitted on the N/S footwell, presumably as an
ex-Wilts Fire Brigade motor they assumed it would be driven
quickly(!) and wanted a reduction in pedal pressure. A few years
after buying it I noticed white/yellow smoke on overrun that
smelled odd. Scratched my head for a while until the brake pedal
hit the deck. It'd obviously failed in such a way as to burn
brake fluid on overrun. Nasty. I did away with it and returned
to a standard 109 system, must be 10 years ago now. No
complaints on performance. Plus the LPG vapouriser fits lovely
where the remove servo was. :-)
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