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O/T Figure this one out

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old

04-16-2008 08:56:28




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Have this old 1965 Ford 1 ton with dump bed, well it didn't have brakes. So yesterday I figured what the heck I would take the master cylinder apart and look it over. Well the kit I got was wrong so I could not put in a kit. So I cleaned it up and spray every thing down with carb cleaner, didn't have any brake cleaner on hand. Lite honed the cylinder and reassembled it. Put it on the truck this morning and pumps the pedal about 10 times and I now have brakes. So how in the world did I fix it and not put in new parts??

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KEB1

04-16-2008 19:11:02




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
Probably a combination of two things, first the cylinder was probably coated with enough crud or rust the piston couldn't seal, which you fixed by honing, and second, as noted below, the carb cleaner made the rubber swell.

Keith



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Roy in georgia

04-16-2008 18:21:34




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
maybe you could go to a newer master cylinder off a junk yard truck I have made them work on other vehicles before 1974 AMC matador was one that I couldn't find one for and used another one off a 1979 Ford LTD. just remembered it was the booster not the master but I still had to make it work. Now, with that said I am sure you can pull out that engineering degree and put it to use on this one.



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old

04-16-2008 19:34:09




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 Re: O/T Figure this one out in reply to Roy in georgia, 04-16-2008 18:21:34  
What engineering degree, unless your talking afro which I have a degree in LOL



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Roy in georgia

04-17-2008 17:52:24




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 Re: O/T Figure this one out in reply to old, 04-16-2008 19:34:09  
that would be the one I got mine some time back and use it often also called a class A or N depending on your choice of terms my dad calls it (air flow engineering) which I think is funny



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old

04-17-2008 19:32:04




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 Re: O/T Figure this one out in reply to Roy in georgia, 04-17-2008 17:52:24  
Is that like the electric go cart I built when I was 15 or 16. Only problem it had was when you ran out of extension cord the motor stopped working. I used washer and dryer parts and a 1.4 hp electric motor on it. Never got it to full speed because it would un-plug its self



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Roy in georgia

04-18-2008 15:00:56




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 Re: O/T Figure this one out in reply to old, 04-17-2008 19:32:04  
thats pretty funny never tried one of those I mostly tinkered with old cars we seemed to have plenty beck then. My dad would get another after a few years and let the broken down ones sit until I got old enough then I had to figure them out.



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jose bagge

04-16-2008 12:51:42




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
That Carb cleaner is probably what fixed it- caused all them rubber peices to swell up almost to brand new size!

I once threw a rubber mastercylinder cap diaphram
into the parts washer overnight- I could wore it as a hat the next morning! It was HUGE!



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greg b

04-16-2008 11:07:20




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
its a miracle,that never works for me



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huntingreen59

04-16-2008 09:56:20




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
You just have to admit you are good. LOL. Now I have a lot of stuff that I could use some no cost repairs on.



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Gerald J.

04-16-2008 09:53:42




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
I had a 65 F-350 for a couple decades. It came with a master cylinder that would stop it maybe one time out of three tries, but not a regular function. Fortunately it had a NP-435 transmission with a 6.5:1 granny gear and and a 5.125 rear axle so it would almost stop by shifting down.

The old master cylinder's problem was a separate rubber check valve that was broken so it only closed when pushing on the piston part of the time.

Gerald J.

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Mike M

04-16-2008 09:22:25




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
We had one of those same trucks around 1980 ? area. It had the best brakes of anything I can remember. It would darn near throw you through the windshield if you hit them hard empty and did really well loaded down too. With that flat frame the seat is low to the pedals and it was really hard on the back driving it though.



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Ebbsspeed

04-16-2008 09:00:10




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 Re: O/T Figure this one out in reply to old, 04-16-2008 08:56:28  
I'd guess that you had a chunk of rust or other crud in one of the holes in the bottom of the reservoir, and wasn't letting brake fluid get into the cylinder. I will usually disassemble a non-working master cylinder first, before I even buy a rebuild kit. A lot of times a good cleaning and light hone will bring them back to life.



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old

04-16-2008 09:02:55




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 Re: O/T Figure this one out in reply to Ebbsspeed, 04-16-2008 09:00:10  
Also forgot to say before I did this it would leak all the fluid out in less then 24 hours and now if is not leaking as it did before



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Mathias NY

04-16-2008 10:07:40




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 Re: O/T Figure this one out in reply to old, 04-16-2008 09:02:55  
Sometimes leaks will fix themselves with corrosion and caked dirt/oil. Do worry too much, with a little use the leaks will probably come back.



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Ron in Nebr

04-16-2008 09:40:31




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 Re: O/T Figure this one out in reply to old, 04-16-2008 09:02:55  
It musta been leaking back past the master cylinder piston seal, which is why it didn't work before too.

One thing to consider, especially since ya sprayed it with carb cleaner, assuming you sprayed everything including the rubber seals with the carb cleaner....Carb cleaner, and most any solvents, will soften up rubber and make it swell a bit. Which could be why it's working now. However, it also deteriorates the rubber at the same time it's softening it. If this dumptruck is something you use on public roads, it would probably be safest to go ahead and get a new kit for it.

And, like mentioned before, it's usually the best bet to dissassemble any master cylinder or wheel cylinder and measure the bore size before buying the kit, especially on older stuff. Seems like 9.99 times outta 10 if you purchased the kit ahead of time, it'll be the wrong size!

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Bob

04-16-2008 12:05:05




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 Re: O/T Figure this one out in reply to Ron in Nebr, 04-16-2008 09:40:31  
I agree with you 100%, Ron.

NEVER use carb cleaner on brake parts.



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old

04-16-2008 14:40:42




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 Re: O/T Figure this one out in reply to Bob, 04-16-2008 12:05:05  
Bob normally I would not have used carb cleaner on it but I figured I had nothing to loose since it didn't work any how and then today I found out that the kits can not be had any how. I can replace the master for $116 plus tax and for a truck that gets maybe 100 put on it once every 4-5 years I figure its not worth that

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old

04-16-2008 10:16:28




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 Re: O/T Figure this one out in reply to Ron in Nebr, 04-16-2008 09:40:31  
Its not used out on the road just around the farm. It has so many problems it would take way to much money to put back on the road. King pins are bad, lights do not work etc. etc. I just use it here on the farm to haul gravel and dirt and fix fences



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Ron in Nebr

04-16-2008 22:35:42




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 Re: O/T Figure this one out in reply to old, 04-16-2008 10:16:28  
Kinda figured it was a farm-use only vehicle. Heck, around here, I'd been driving tractors for several years before I finally drove one that actually still had working brakes on it! Although I did end up repairing a barbed-wire gate or two....

Use it as-is around the place till the brakes quit working again in your situation I'd say....that is, unless you're backing up to dump stuff over high cliffs, etc! Long as you're going slow and allow yourself plenty of time for good ol' granny gear to slow you down, and don't have to worry about other traffic, should be no problems...been there, done that!

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