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Author Topic: Master cylinder size 850 GT  (Read 1029 times)

Offline motogman

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Master cylinder size 850 GT
« on: August 03, 2019, 06:27:59 PM »
What is the diameter (in order to buy a rebuild kit) for the front brake master cylinder on a '74 850 GT?
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Offline Furbo

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Re: Master cylinder size 850 GT
« Reply #1 on: August 04, 2019, 08:36:54 AM »
I'm guessing....11mm as it was only supposed to operate one disc.
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Killeen, TX
'96 Sport 1100
'72 N. Falcone
'72 Eldo

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Online Antietam Classic Cycle

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Re: Master cylinder size 850 GT
« Reply #2 on: August 04, 2019, 08:39:08 AM »
There should be a number on the underside of the master cylinder that denotes what size it is. If it's the same master cylinder as used on the US market disc Eldorado, it's "15 mm" (actual piston diameter is 15.84 mm).
http://www.mgcycle.com/index.php?main_page=product_info&cPath=110_112&products_id=753

That 15 mm master cylinder was never a good match for a single F08 caliper (as on the Eldo), although it does work well with two F08s.
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