Cooper S servo

Looking for that elusive part, shout about it here.
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Rev 1.2 (16.09.20)
ntonio
Posts: 57
Joined: Tue Jun 19, 2018 7:43 am

Cooper S servo

Post by ntonio »

Hi!
Does anybody know where to find a MK1 Cooper servo or a website where buy a reliable repro one at good price?

Regards
Antonio
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iain1967s
Posts: 1609
Joined: Sat Jun 10, 2017 12:46 am
Location: Cambridge, MA, USA

Re: Cooper S servo

Post by iain1967s »

https://www.alfaholics.com/parts/105-se ... rake-servo

That’s the nearest repro I’ve seen.
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Peter Laidler
Posts: 3535
Joined: Sat Jul 15, 2017 5:35 pm
Location: Abingdon Oxfordshire

Re: Cooper S servo

Post by Peter Laidler »

Did I hear that the overhaul kits are interchangeable too?
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Andrew1967
Posts: 6811
Joined: Thu Jun 24, 2010 6:35 pm
Location: Usually in my garage on the east coast of Norfolk, UK

Re: Cooper S servo

Post by Andrew1967 »

Not sure of the difference to braking effect in practice but remember that not all Type 5 1/2’s are equal ….

Different bore sizes are indicated by machined grooves on nose of body. S servos have no groove.

What bore size are the repro ones ?
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iain1967s
Posts: 1609
Joined: Sat Jun 10, 2017 12:46 am
Location: Cambridge, MA, USA

Re: Cooper S servo

Post by iain1967s »

I have one on order, so I’ll report back when I fit it in Spring.
LuisM
Posts: 485
Joined: Tue May 27, 2014 3:47 pm
Location: Porto, Portugal

Re: Cooper S servo

Post by LuisM »

Hello Antonio ,

I have a genuine mk1 servo for sale , needs a full rebuild though.
Please PM me if you have any interest .

Cheers
Luís
TECH396
Posts: 192
Joined: Sun Feb 16, 2020 10:12 pm
Location: Vancouver Island BC Canada

Re: Cooper S servo

Post by TECH396 »

I looked into those Alfa ones some time ago.
I was informed that the Pressure Ratio was higher on the Alfa one, due to the larger Diaphragm size.
The bore size was 5/8". Here's the reply I got from them.

[quote....The Bendix servos are similar to Mini ones but the pressure ratio is higher on the Alfa one.
BR006 diaphragm for the BR100 servo is 6.85” o/d. the seal that goes against the piston is 5/8”....quote]
Paul H.
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Nick W
Posts: 2577
Joined: Sat Jan 17, 2015 9:59 pm
Location: sheffield

Re: Cooper S servo

Post by Nick W »

I used to use the alfa one one my old green S, it worked perfectly fine.
The mini spares one, is a more accurate looking one, but don't think they make it any more due to some having issues. Although the 2 that I fitted worked fine.
Up North in Sheffield
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spoon.450
Posts: 1615
Joined: Fri Jan 20, 2012 10:13 pm
Location: DERBYSHIRE

Re: Cooper S servo

Post by spoon.450 »

I once had an Alfa servo but was put off slightly as it had metric ( M10 x 1 ) threads for the brake pipe fittings, rather than the 3/8 UNF as Mini.
jaknight
Posts: 123
Joined: Fri Jan 09, 2015 2:58 am
Location: South Lyon, Michigan USA

Re: Cooper S servo

Post by jaknight »

Nick W
I purchased a Mini Spares reproduction brake servo a few months back but not installed.

Do you know what issues those servos may have ?? That concerns me as to the safety depending upon issues.

Thanks

Jim K
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