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Contributor
Location: Prescott, AZ | Are there aftermarket replacements for these check valves? I have the larger boosters. I've uploaded a photo of one check valves in my albums.
Also wondering who the manufacturer of these boosters is. All I can get off mine is "assembled in Mexico"
Thank you!
Vincente |
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Elite Veteran
 
Location: Victoria, BC. Canada | IF you have the large hydo-vacs they should have the check-valves in them. IF they are the large ones, they should be set up with the LARGE master-cylinder which should NOT have the check valves in the outlet ports. If you are running the small master-cylinder that also HAS the check-valves in them (outlet ports) with the large h-vacs (w/check-valves) you have a problem. And vise-versa.
Hope I got this right and I hope it helps.
Terry
#846 |
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Contributor
Location: Prescott, AZ | Terry,
I have the large MC and large boosters, one front and one in the back engine compartment. There I also have the check valves connected to both boosters. The photo I uploaded shows the check valve which was connected to rear booster (I removed the hose). So you're saying this is a wrong setup? |
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Elite Veteran
Location: Victoria, BC. Canada | Vincente,
It struck me that you were looking to replace the check-valves or discovered that you were missing them. Regardless, I just went through all this H-vac shit and learned that you cannot get parts or rebuild-kits for them any more. As far as I can tell, Cardone are the only ones building (re-building) them now. Up here in Canada prices for the large H-vac vary from over $400/ea (Napa) down to about $300-ish. I found out that O'Reilly's Auto parts in the States will sell them for about $135-ish each plus about $50-bucks to ship them to one of their stores near the Canuck border. Planning on ordering them in the not to distant future (along with 8-new wheel-cylinders and a gallon or so of DOT-5 silicone fluid) then the wife & I can have great excuse to spend a weekend in Seattle and bring the whole works home with us.
There's lots of guys on here that are awesome with FMC brakes but if no one chimes in and you need part #'s or anything, let me know and I'll dig up the info on the O'Reilly stuff.
Terry |
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Extreme Veteran
Location: Scottsdale, Aridzona | http://www.ebay.com/itm/C3TZ-2365-A-FORD-FORD-POWER-BRAKE-BOOSTER-B...
CHEAP ! and FREE Ship !
Or . . . nine other sources:
http://www.rearcounter.com/C3TZ-2365-A-parts47678.html
Lou #120
Edited by hemi354az 2015-02-08 12:42 AM
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Contributor
Location: Prescott, AZ | Lou, thanks for the links!
Though after Terry's post I'm confused on whether i even need these. I definitely have the large boosters just don't know if they have check valves installed and I can't ID them. |
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Elite Veteran
Location: Victoria, BC. Canada | Shows what/who you should believe I guess.
Perhaps I was premature with my statement that, "...you can't get parts" as maybe these particular 'parts' are not considered part of the re-build kit which- I do remember - reps at Cardone/Raybestos and/or Bendix all said was not available any more.
I hope someday someone finds an alternate source/method for an easy and relatively inexpensive DISC-BRAKE conversion on these cool old rigs. I know Frank Boormann was working on it for some time and others have mentioned they had disc-brakes on their coaches; just don't know how many were converted by using FMC Transit parts. If I ever get my crap together ("ever" being the operative word here) I'd really like to dive into this either on my own or with a group of other owners. Frank would be a good guy to start with as I recall he said an older GM med/truck or bus set-up showed some promise with only minimum machine work required.
Even a front brakes only conversion would be hugely useful in my view. I digress, we were talking about H-vacs and check-valves.
I went out and measured the booster can-circumference (pulled a light gauge wire around it right next to the clamp-ring where the 2-halfs join) and it came out at about 35 1/2". I also checked an older email
from Randy Bradshaw back when he was helping me with the brake-work I did on #509 (Randy's done a ton of work/research on FMC brakes -we all owe him) and back then I had measured both the large & small H-vac drum dia and I wrote that the large one was 36" and the small one was closer to 30". Big difference.
I also was concerned -back then- about confirming the presence/absence of check-valves in the H-vacs; after I bought and drove #509 a thousand miles back up to Canada - with 'VERY-SCARY-BRAKES' - I wanted to make sure they were set up right. Randy pointed out that with the unit sitting on the bench you can actually see the check-valves in the end of the thing. Take this with a grain of salt but I seem to recall (don't remember if it was at Randy's suggestion, or, if it actually happened for that matter) that I could stick a small nail or such in the end of the hole and actually push on it and feel the spring-tension. Again, don't quote me on this and maybe someone else could chime-in here to corroborate this.
Hope this helps.
Terry
#846 |
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Extreme Veteran
Location: Scottsdale, Aridzona | Lagunacat,
You are getting your check valves mixed up.
Perhaps you should make the time to take the Auto Brake Course at Yavapai College right there in Prescott AZ:
http://www.yc.edu/academics/degrees-and-certificates/automotive-tec...
Brake ON, Lou #120
Edited by hemi354az 2015-02-08 11:34 AM
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Contributor
Location: Prescott, AZ | Hi Terry,
Yes that helps! I measured my booster and got 36". I am going to assume that I have the check valves already in these, but will still try to confirm. If so I'm not sure why the PO had the hoses connected to the old body check valves, which look they might be the originals and probably long past any usefulness. I did notice there are clamps missing at the tee.
Yes discs in the front would be a huge plus! |
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Extreme Veteran
Location: Ignacio Colorado | Slow down, You are talking about different check valves now! Vacuum check valves are as you said "in line" but the check valves dealing with the boosters are in the brake hydraulics. The booster check valves are only on the large boosters, the small booster system has the check valves in the master cylinder. Looking at the large booster the valve looks like a 1" thick or so nut/fitting in the end of the cylinder farthest away from the booster vacuum can. The small boosters have a similar fitting that is more like 1/2" thick and has no check valve.
Please don't go poking nails in anything but wood Terry. Dang carpenters!!
Bill |
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Elite Veteran
Location: Victoria, BC. Canada | Ha-ha! Raza-Raza!
Note I did say that I couldn't remember for sure. Memory ain't what it used to be... |
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Check valves for brake booster.
