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FDNY 343

1955 B-Model Master Brake Cylinder

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Hi All,

Going over my 1955 Model B85 rig for the first time I realized the Master Cylinder was empty. I filled it and went around to bleed all the brakes. All was good, pedal felt high and firm. Came in the garage this afternoon and there was a puddle under the Master Cylinder area, I checked the Master and it was empty. Upon further inspection I noticed it was leaking from under the front boot are. I pulled the Master and took it apart to check it out and came to find the cap (which didn't fit well at all) must have allowed for years of debris to get into the brake fluid chamber which made it's way down into the piston area, it was almost a 1/4 filled with sludge, piston had sludge all over etc.. I started to clean everything and now have found pitting in the piston area, the piston and a few other areas. I was wondering if anyone has any of these for sale or know where to get one if possible. It's a Wagner Lockheed CG27. Any help would be much appreciated

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TRY NAPA FIRST (SEE THE OLDEST COUNTER GUY FIRST) ,IF NO LUCK SEE WHITEPOST REBUILDERS IN VA.   they rebuild my master cylinder and hydrovac ,quick turnaround . check their website

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do exactly as 1958 FWD said at Napa, funny but true.

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Same thing just about anywhere really. Went to Autozone for radiator hose and the lady kept pestering me what it was for so she could look it up.

There were no Mack fire engines in her database.

Surprisingly it’s the local places that end up acting like it’s a normal day when you tell them what you have.

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22 hours ago, CaptainCrutch said:

Same thing just about anywhere really. Went to Autozone for radiator hose and the lady kept pestering me what it was for so she could look it up.

If they absolutely, positively MUST "look it up" in a computer and cannot fathom looking at the part casting numbers or measuring the piece and cross-referencing, take your business elsewhere. 

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I thought about just doing a direct replacement of my type 45 master cylinder but I decided to go a different route and converted to a dual chamber.

B2265B00-95A0-4663-858A-2EA3C265DB31.jpeg

4D42F824-0F48-4E1C-8A08-504B90B42571.jpeg

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Is the red item in the bottom of the pictures a hydro-vac?

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Be sure to change over to Motul synthetic brake fluid, to avoid the low-use condensation corrosion issue.

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2 hours ago, Quickfarms said:

Is the red item in the bottom of the pictures a hydro-vac?

 It sure looks like it, wonder how the great the pedal effort will be with out it.

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10 hours ago, Quickfarms said:

Is the red item in the bottom of the pictures a hydro-vac?

It is the booster. My first experience dealing with that particular style. Kind of a bugger to get adjusted.

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8 hours ago, 41chevy said:

 It sure looks like it, wonder how the great the pedal effort will be with out it.

I rebuilt the booster and properly adjusted it. That thing works awesome now. Just by closing the vacuum rod by hand is enough to apply the brakes fully.

Edited by David Johnson
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I rebuilt the booster and properly adjusted it. That thing works awesome now. Just by closing the vacuum rod by hand is enough to apply the brakes fully.


How did you plumb the dual master cylinder into the booster?

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23 minutes ago, Quickfarms said:

 


How did you plumb the dual master cylinder into the booster?

 

The booster is a separate vacuum assisted brake booster. It attatches to a mount on the frame and then on the bottom of the brake pedal.

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42824998-7543-4645-975F-0EEA8D3FAFF6.png

Edited by David Johnson
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nice job on the master cylinder, is that an adapter plate that you had to make for the master cyl. and what is the new  master cylinder from? what engine is that ?

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22 hours ago, 609albert said:

nice job on the master cylinder, is that an adapter plate that you had to make for the master cyl. and what is the new  master cylinder from? what engine is that ?

Thanks. I did have to make the adapter plate but I did it just with a plasma cutter and basic power tools. I believe the master cylinder is off a ‘70’s or ‘80’s motorhome. It had the same bore size and stroke of the original single chamber. I’ll have to get the p/n when I get to work. The engine is a 5.3 out of a ‘05 Tahoe with a FiTech efi system.

Edited by David Johnson

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Thank for the info, when I get ready to change I'll go to the dual master cyl.  the hydovac on my 54 LS85 is a little different than yours.,wish I had air brakes sometimes too.

   You did a nice clean job on all your upgrades.

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