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Brake combination valve

MassMan

MassMan

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Well, it's always something, isn't it? I just got the engine running after a year of headaches and just as i tried to take it for a ride around the yard the brake pedal went to the floor and i had brake fluid all over the frame. The leak is coming from the driver's side of the combo valve, but i can't be sure where. I took it off for a better look but the lines were rusted to the pressure fittings and i snapped the one closest to the leak off and had to cut another with a hack saw. The valve is really beaten up and even if it was just a bad fitting i want to replace it and re-flare the lines.

The first question is where can i get a new combo valve? I checked all the usual online parts stores and all they have is adjustable proportioning valves. Should a local auto parts store have one in stock or available for order?

Also, i've never really done brake stuff before and i'm scared to death of messing something up. anything i should watch out for when flaring the lines and installing everything?

And, finally, a completely unrelated question. The fuel supply hardline rusted out about six inches from the end on top of the tank. I'm planning on cutting all the lines back to the frame cross-member in front of the tank and installing rubber to the tank. Do i need to flare the hard lines like they are from the factory, or will a tight clamp do fine on a straight length of line?
 
double flares on all brake lines... and yes, you should put something of a flare on the fuel line... NEVER a good idea to run hose over straight pipe, even double clamped... ya always want something of a barb...

combo valve, i had a link around somewhere, i'll see if i can dig it up...
 
Seriously consider some of the premade brake line kits. I bought one in stainless for my F250 when I had the bed off.
I had discovered that the lines going to the rear were rusty, and not safe.
I was going to buy a roll of the new stuff that is easy to work like copper, but strong as steel, and dig out my old double flare tool.

When I priced the complete set of brake lines for my truck, prebent, correct fittings, and with all the spring-type protection pieces on, in stainless yet, it was no contest.
 
well, i've inspected the lines and they look ok, it's just the valve and everything around it. looks like a spot road salt collects. i may have to replace lines but i think i have enough to play with.

can i get a flare tool that will do both the brake and fuel type flares for various sizes of line or do i have to get specific stuff?
 
I think this is the place I bought my lines from.
Plus they sell the valve too.

http://www.inlinetube.com/

If you are worried about doing a wrong flare, or kinking a line, this is the way to go. They are just bolt on, bleed, and go. All the lines are bent at the right places, and the fittings are already on.
 
Oops, cross posted.

can i get a flare tool that will do both the brake and fuel type flares for various sizes of line or do i have to get specific stuff?
Click to expand...

Yep, they sell kits that will do single and double flares. Don't know who right now, but I'll look around.
 
would it be a crazy idea, since you need to mess with tubing anyway, to just run one solid line from the MS to the front block. Then run the cheaper adjustable prop valve for the rear brake feed. Does the same thing and you can adjust to your liking.
 
it works.. but you lose the brake failure light aspect... tho I suppose you could add a dual switch system, front and rear.....
 
ryoken said:
it works.. but you lose the brake failure light aspect... tho I suppose you could add a dual switch system, front and rear.....
Click to expand...

oh, is that the tan wire? Mine seems to end shortly after the combo, looks like someone hacked it off at some point :whistle:

don't have a dash light anyway :D
 
I found that a single flareing tool made for plumbing uses will not work with double flare adapters,after buying a set of the little "buttons" you need to make the double flare--my tool wasn't tall enough to let the double flare adapters work!..ended up buying a used double flaring tool at a flea market for 10 bucks..most parts stores sell them for about 20 bucks.........................................................................................................................................................................................................I have replaced many brake lines using just a single flare when the single flare tool was all I had--I know its not reccomended,but I never had a problem either--I figured a new steel line with a single flare HAD to be better than a rotted original line thats ready to pop...or using compression fittings!..which do work,but are illegal and hazardous,I have used some before in a "emergency" while plowing ,but I do not trust them...I found 3 of them on the rear brake line on one of my trucks when I replaced the line after it rotted thru!--I was shocked to see them,and surprised they never failed or leaked!.......................................................................................................................................................................................................I like the new rolls of brake tubing thats becoming more available at parts stores--its much thicker than the ready made lines,and only costs about 20 bucks for a 25 foot roll of it...resists rust much better than pre made ones,and they come with an assortment of line nuts and adapter fittings too,saves hunting down the right fittings or having to save and re-use the originals..
 
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