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1955 1st Series Master Cyl Question
#1332348 Sat Nov 02 2019 11:14 PM
Joined: Jul 2018
Posts: 8
B
New Guy
I have a 55 1st series and am putting in an new single master cylinder like the original and stainless lines. My brake line to the master cyl is a 7/16 and it appears the new master cyl is a 1/2" connection. The adapters that I have seen both online and at the auto parts places don't seem to be long enough to reach the inside of the master cyl to make a good compression connection. I expect it will leak if it isn't long enough. I am not sure why the new one has a 1/2 in connection. Appreciate any advice.


Bill Pease
Re: 1955 1st Series Master Cyl Question
Bill Pease #1332352 Sat Nov 02 2019 11:51 PM
Joined: Mar 2007
Posts: 1,003
T
Crusty Old Sarge
Check with Speedway. they carry a line of fitting and should have what your looking for. You can talk to their Tech folks and let them know what your working on.


Craig

Come,Bleed or Blister somethings got to give!!!
59' Apache 31, 327 V8, Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
Re: 1955 1st Series Master Cyl Question
Bill Pease #1332435 Sun Nov 03 2019 05:23 PM
Joined: Mar 2010
Posts: 9,524
5
Master Gabster
The 55.1 master cylinder does not have an inverted flare hole in the end of it. It requires a special banjo fitting, consisting of bolt with an inverted flare in the head of it. This bolt passes through a brass block which provides for attachment of an additional brake line.
For some reason, this setup splits the front left wheel from the other 3 wheels at the master cylinder. Models prior to '51 did not. There was simply one single inverted flare on the end of the master cylinder which fed all four wheels.
Carl

Re: 1955 1st Series Master Cyl Question
Bill Pease #1332574 Mon Nov 04 2019 05:09 PM
Joined: Nov 2018
Posts: 85
D
Awesome Grandpa
I replaced the brake master cylinder on my 1954 Chev 3100, and also couldn't find a replacement Banjo bolt fitting, so I bought new copper compression ring and reused the old one.
I would like to find a new one if possible.
Below is a picture of it.

Attached Files
20190117_184929.jpg (213.01 KB, 93 downloads)
Banjo Bolt
Re: 1955 1st Series Master Cyl Question
Bill Pease #1332595 Mon Nov 04 2019 10:28 PM
Joined: Jul 2018
Posts: 8
B
New Guy
Mine is an automatic which appears to have a different routing of the lines due to the transmission brace. The drivers side is fed across the front of the truck from the passenger side. As a result, it doesn't have a double connection at the master cylinder. I tried getting the old nut off the master cylinder so I could use the old 7/16 fitting, but wasn't able to get it off.


Bill Pease
Re: 1955 1st Series Master Cyl Question
Bill Pease #1332596 Mon Nov 04 2019 10:41 PM
Joined: Sep 2001
Posts: 30,929
Boltergeist
That is correct, Bill

The clutch-transmission lines/fittings and master-cylinders are different for clutch trucks and Hydra-Matic trucks.
Of course, due to the extra/different cross-members, the H-M lines-routing is also different from the clutch truck.

Keep all your old H-M brake line fittings (with small pieces of lines connected to each fitting).
Draw a diagram of the routing of all lines.

Luckily, I was able to either reuse fittings and/or find new fittings (several years ago).


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]

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