line ??

[CCWKen]

Sorry, that is incorrect. Average is 1000-1500 for automobile braking systems, and they do not see the shocks/spikes is pressure that a tractors hydraulic system does.

In "average" braking, that would be true. Typically, it's 100 bar or about 1450psi for power assisted brakes. In emergency or panic stops, initial fluid pressure can be up to four times that! The design of the braking system components takes that into consideration. Including the brake lines.

Added:
This discussion is mute. The OP said he has brake line rated to 16k psi burst which is the common 4x safety margin for designs.

 

[kennyd]

In "average" braking, that would be true. Typically, it's 100 bar or about 1450psi for power assisted brakes. In emergency or panic stops, initial fluid pressure can be up to four times that! The design of the braking system components takes that into consideration. Including the brake lines.

Added:
This discussion is mute. The OP said he has brake line rated to 16k psi burst which is the common 4x safety margin for designs.

I just looked up a typical brake hose, in this case for my old 92 F250 7.3L IDI truck, they are "tested" to to 4000psi, so they are obviously expecting the average working pressure to be much lower.




Yes, the OP did say what his tubing is spec'ed at-and that does sound usable in this case, but the average steel brake lines are NOT rated to what he posted-hence my first reply.

Here is a Dorman "kit" for a GM truck, again notice the rating at 4000psi:
Dorman Products - 919-116

Here is a few brake line gauge kits, notice the pressure range on them:
Brake Pressure Tester Gauges : Brake Pressure Gauges : Racing Brake Pressure Tester Gauges

Brake Hydraulic System Pressure Bleeder Pressure Gauges - Free Shipping @ Speedway Motors

Auto Meter 4426 | Buy Auto Meter Ultra-Lite Gauges at JEGS

Fact are facts sir, your just not going to generate that high of pressure in an automotive braking system.

 

[Tractor Seabee]

Uniquely just the other day I was discussing flaring Hyd tube with my local hydraulic shop and using brake line material. He stated they use a 45 degree flaring tool due to the very costly 37 degree tool. He stated he would not flare tube for someone unless they had hydraulic rated tubing or bought the tube from him due to liability. Brake tube is seamed whereas hydraulic is extruded seamless. I asked about double flare as I have the tool for 45 degree. He stated double flare is not required or recommended for hydraulic work. He said doing a regular flare is hard enough w/o trying to double. Tube wall thickness is much thicker.

During my pipefitter days I did a lot of industrial hydraulic work. We always used compression type fittings rated for the system pressure. 10,000 PSI was not uncommon. They are critical to get on properly and torqued down but can be done with standard wrenches. Learning curve is pretty short. It is easy to screw up a flare when inexperienced; we used a lot of flares on refrigeration so we got pretty good at it.

The OP sounds like a novice at this so I highly recommend he do some practice joints before tackling the ones that count. Boo Boos can eat a lot tubing up fast.

Ron

 

[TMGT]

Yup, double flare on the heavier .040+ DOM isn't going to happen.
Not sure why everyone is talking about expensive tools for 37* flares though, cheap tools are about 50 and nice hyd. tools are about 250-500 depending on what dies it comes with. 45 and 37 dies for the hyd. tools cost the same.

 

[love4god]

i have flared and done plenty of lines, i just didnt no what ends to use,
i have a good 45* flare tool i dont see any problem with using ,it as others have said
the tube is soft enough to form to it , with the double flare,the DOM is nice , if i had the cash i would get it,
but,,ill have to make do with what i have, thank you all for your help,godbless