FDNY 343 Posted January 14, 2019 Share Posted January 14, 2019 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 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/ Share on other sites More sharing options...
1958 F.W.D. Posted January 15, 2019 Share Posted January 15, 2019 Jimmy, As with many parts, it is not proprietary or exclusive to Mack. In all likelyhood, it was probably a Ford or GM master cylinder. Both the brake master cyl and the clutch master cyl in my 1958 F.W.D. are FoMoCo OEM parts. Take the old one to an old-school NAPA parts counter. The older the better. Drop it on the counter and say "I need one of this." DO NOT TELL THEM WHAT IT CAME FROM. This will only make matters worse- you will say Mack which may make them blink, and then you'll say Fire Truck, which will make them go into vapor lock. Just drop it on the counter and say "Gimme a new one or a rebuild kit." Chances are that one is available through Wagner or Bendix. 2 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-413291 Share on other sites More sharing options...
609albert Posted January 15, 2019 Share Posted January 15, 2019 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 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-413293 Share on other sites More sharing options...
609albert Posted January 15, 2019 Share Posted January 15, 2019 do exactly as 1958 FWD said at Napa, funny but true. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-413294 Share on other sites More sharing options...
CaptainCrutch Posted January 15, 2019 Share Posted January 15, 2019 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. Quote Who needs a back yard when you could have a Yard?! Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-413295 Share on other sites More sharing options...
1958 F.W.D. Posted January 16, 2019 Share Posted January 16, 2019 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. 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-413359 Share on other sites More sharing options...
David Johnson Posted February 22, 2019 Share Posted February 22, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416364 Share on other sites More sharing options...
Quickfarms Posted February 22, 2019 Share Posted February 22, 2019 Is the red item in the bottom of the pictures a hydro-vac? Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416385 Share on other sites More sharing options...
kscarbel2 Posted February 22, 2019 Share Posted February 22, 2019 Be sure to change over to Motul synthetic brake fluid, to avoid the low-use condensation corrosion issue. Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416388 Share on other sites More sharing options...
41chevy Posted February 22, 2019 Share Posted February 22, 2019 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. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416393 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416444 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 (edited) 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 February 23, 2019 by David Johnson 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416446 Share on other sites More sharing options...
Quickfarms Posted February 23, 2019 Share Posted February 23, 2019 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? Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416450 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 (edited) 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. Edited February 23, 2019 by David Johnson 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416452 Share on other sites More sharing options...
Quickfarms Posted February 23, 2019 Share Posted February 23, 2019 What Mack trans is that Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416453 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 1 hour ago, Quickfarms said: What Mack trans is that It’s not. Th400 behind a LM7 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416458 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416460 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416461 Share on other sites More sharing options...
David Johnson Posted February 23, 2019 Share Posted February 23, 2019 Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416462 Share on other sites More sharing options...
609albert Posted February 25, 2019 Share Posted February 25, 2019 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 ? Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416611 Share on other sites More sharing options...
David Johnson Posted February 26, 2019 Share Posted February 26, 2019 (edited) 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 February 26, 2019 by David Johnson Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416683 Share on other sites More sharing options...
David Johnson Posted February 26, 2019 Share Posted February 26, 2019 Here is the master cylinder I used. It has the same bore and stroke of the original single chamber. Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416753 Share on other sites More sharing options...
609albert Posted February 27, 2019 Share Posted February 27, 2019 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. Quote Link to comment https://www.bigmacktrucks.com/topic/55293-1955-b-model-master-brake-cylinder/#findComment-416801 Share on other sites More sharing options...
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