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Old 11-05-2020, 02:19 PM   #1
jerry shook
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Default Master cylinder

I have a 31 A with the master cylinder on the right side. Is this done on a lot of cars. Don’t have good brakes. everything has been put on new. Photos or any help would be appreciated.
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Old 11-05-2020, 02:46 PM   #2
1931 flamingo
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Default Re: Master cylinder

There was a recent thread on this (maybe yours??) with the pic you want.

Many conversions were done this way using the brake cross shaft. Do you have 39-42 backing plates or the easier to adjust 42-48's??
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Old 11-05-2020, 03:05 PM   #3
Charlie Stephens
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Default Re: Master cylinder

Without seeing it I would suspect the leverage of the linkage. When you push the pedal how much does the rod at the master cylinder move? When you say you don't have good brakes what are they doing? Any photos?

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Old 11-05-2020, 06:13 PM   #4
jerry shook
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Default Re: Master cylinder

I did put a thread. Just trying to get more info. Charlie you wrote about leverage of the linkage. I will look tomorrow morning to see how for the rod is going into the cylinder that may be my problem. On having good brakes the peddle goes nearly to the floor pumping don’t do any good it will stop but not good enough to trust driving. Don’t know how to send pics. The plates are 40. How much should the rod move. Thanks everyone.
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Old 11-06-2020, 08:41 AM   #5
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Default Re: Master cylinder

Have you adjusted the brake shoes?? New shoes?? Bled the system?? Maybe 1/8" brake rod clearance.
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Old 11-06-2020, 12:22 PM   #6
Charlie Stephens
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Were they good at one time and then went bad?

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Old 11-06-2020, 02:28 PM   #7
jerry shook
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Default Re: Master cylinder

Charlie the car was did not have good brakes when I bought it. All the brakes except the metal lines I have put on new adjusted bled an rod clearance.
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Old 11-07-2020, 12:25 PM   #8
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Default Re: Master cylinder

What kind of master cylinder does the car have? Maybe it's undersize?
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Old 11-07-2020, 07:43 PM   #9
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Default Re: Master cylinder

Katy. The master cylinder is for a 40 ford.
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Old 11-08-2020, 02:55 AM   #10
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Default Re: Master cylinder

A Ford Truck master cylinder has a larger piston.
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Old 11-08-2020, 03:55 PM   #11
jerry shook
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Default Re: Master cylinder

Chris would the larger piston push more fluid or more pressure to the wheels. An how for should the rod go into the master cylinder.
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Old 11-08-2020, 04:06 PM   #12
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Default Re: Master cylinder

Quote:
Originally Posted by jerry shook View Post
I have a 31 A with the master cylinder on the right side. Is this done on a lot of cars. Don’t have good brakes. everything has been put on new. Photos or any help would be appreciated.
Model A Ford Mechanics Handbook Vol 2 by Les Andrews excellent with parts needed How to install etc. Hydraulic Brakes.
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Old 11-09-2020, 02:51 AM   #13
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Default Re: Master cylinder

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Originally Posted by jerry shook View Post
Chris would the larger piston push more fluid or more pressure to the wheels. An how for should the rod go into the master cylinder.
Larger piston = more volume. Bolts on exactly like the passenger car cylinder and looks the same.
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Old 11-09-2020, 08:35 AM   #14
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Default Re: Master cylinder

Do you get a hard pedal after bleeding?? Which backing plates do you have?? 39-42 or 46-48?? Wheel cylinders mounted correctly?? Go to the V8 forum and search : Brake Adjust.

Paul in CT
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Old 11-09-2020, 09:34 AM   #15
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Default Re: Master cylinder

After toying with that idea and not feeling comfortable with the geometry, I went with Daves battery box set up, dual Mustang master is hard to beat.
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