Master Cylinder Pipe and Nut size?

Talk about the E-Type Series 1

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Airborne62
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#1 Master Cylinder Pipe and Nut size?

Post by Airborne62 » Sat Apr 01, 2023 8:27 pm

Greetings - I have installed new masters for Brakes and Clutch on a restoration. I don't have the old pipes/nuts from the Reservoirs to the cylinders. Does anyone know if these are 1/4" pipe (7/16 20 UNF nut) or 5/16" pipe (1/2 20 UNF nut).
Thanks for the insight -
Airborne62
'62 FHC

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Airborne62
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#2 Re: Master Cylinder Pipe and Nut size?

Post by Airborne62 » Sun Apr 02, 2023 1:50 pm

Found a 7/16 20 UNF bolt that fits the cylinders. Must be a 1/4" line so I will order proper long brake line nuts from Fedhill.com
Airborne62
'62 FHC

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tim wood
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#3 Re: Master Cylinder Pipe and Nut size?

Post by tim wood » Sun Apr 02, 2023 4:38 pm

Hi,
If you mean the feed into the masters then I believe that it’s choline ( rubber) that the feed to 1/4 copper.

If you search “ choline” on the forum you will find lots of info
Series 1 FHC purchased 40 years ago. Courted my wife in it.
Series 1 2+2 when the kids were small now sold.
Series 1.5 OTS in opalescent maroon, Californian car. My retirement present.

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abowie
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#4 Re: Master Cylinder Pipe and Nut size?

Post by abowie » Mon Apr 03, 2023 12:18 am

Airborne62 wrote:
Sun Apr 02, 2023 1:50 pm
Found a 7/16 20 UNF bolt that fits the cylinders. Must be a 1/4" line so I will order proper long brake line nuts from Fedhill.com
I've got a feeling that the feed pipe from the reservoir is bigger than 1/4", but I don't have a car here to look at ATM.

If your thread is definitely 7/16" it might be 5/16 pipe.

All of the other brake fittings are 3/8"UNF and have 1/4" pipe.

EDIT. This is wrong see below.
Last edited by abowie on Mon Apr 03, 2023 11:24 pm, edited 1 time in total.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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mgcjag
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#5 Re: Master Cylinder Pipe and Nut size?

Post by mgcjag » Mon Apr 03, 2023 8:25 am

Typical is 1/4 inch pipe with its flare fitting needing 7/16 -20 unf........brake calipers etc 3/16 pipe with 3/8-24 fitting ......the fitting that screws into the master is an outlet union part 10921 the thread on the master is 5/8-18 unf.(depending on your master)and accepts the 7/16-20 into it....this is from memory so please feel free to chip in with more detail.....Steve
Steve
69 S2 2+2 (just sold) ..Realm C type replica, 1960 xk150fhc

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abowie
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#6 Re: Master Cylinder Pipe and Nut size?

Post by abowie » Mon Apr 03, 2023 9:38 pm

I'm pretty sure Steve is right.

EDIT. I have measured some pipe and fittings I have.

the 3/8 UNF fittings take 3/16" pipe. The pipe I have is 0.190" OD.

The bigger fitting is 7/16 UNF, and has a bore of 0.260", so uses 1/4" pipe.

Sorry for any confusion.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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Airborne62
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#7 Re: Master Cylinder Pipe and Nut size?

Post by Airborne62 » Tue Apr 04, 2023 1:01 am

Thanks for the input - it is appreciated
Airborne62
'62 FHC

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