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Cooper S servo

Posted: Sun Nov 21, 2021 7:51 pm
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

Re: Cooper S servo

Posted: Mon Nov 22, 2021 12:31 am
by iain1967s
https://www.alfaholics.com/parts/105-se ... rake-servo

That’s the nearest repro I’ve seen.

Re: Cooper S servo

Posted: Mon Nov 22, 2021 4:42 pm
by Peter Laidler
Did I hear that the overhaul kits are interchangeable too?

Re: Cooper S servo

Posted: Tue Nov 23, 2021 10:19 am
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 ?

Re: Cooper S servo

Posted: Tue Nov 23, 2021 1:04 pm
by iain1967s
I have one on order, so I’ll report back when I fit it in Spring.

Re: Cooper S servo

Posted: Wed Nov 24, 2021 9:07 pm
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

Re: Cooper S servo

Posted: Wed Nov 24, 2021 11:31 pm
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]

Re: Cooper S servo

Posted: Thu Nov 25, 2021 9:36 am
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.

Re: Cooper S servo

Posted: Thu Nov 25, 2021 11:55 am
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.

Re: Cooper S servo

Posted: Sat Nov 27, 2021 3:03 am
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