need help double flaring a brake line

[oldblue1968chevy]

Ok, that sounded dumb...

I think I have 5/16 or 1/4 going to the rears, I did some of the front in 5/16 as well?

Im talking from Mc to prop. valves AND line comming off prop. vavle going to rears is all 5/16 i believe

The line going to FRONT brakes from bottom of prop vavle is 1/4 or 3/16 not sure, I htink 3/16, ECE sent it to me prebent, so i assume its correct?

[ERASER5]

Nope. 1/4" for the rear. At the MC, the NUT is bigger, but still only a 1/4" line. As said by cparman, you will not get a good pedal with line that is too big.

[oldblue1968chevy]

Hmm....

I'll check it all out morrow and letchall know...may have all my lines wrong

So JUST the lines from Mc to prop. vavle, (F/R) What size should those be? Thank you.

Ps, I will double check the rears morrow afternoon!

[chevy_mike]

Yes, don't let the nut size make you think the lines are bigger than they are. I have never seen ANY GM, Ford or Mopar (pre metric ones) with lines that were not either 3/16" or 1/4". Typically you want the same line size from the MC to the prop valve as the lines are to the rest of the system. If you are converting to disc brakes but NOT redoing the hard lines on the frame, everything would be 1/4" lines, which though not correct for the disc brake (i.e. front) lines, will work. If you only were picking one size to use, use 3/16" for everything as it's a little less volume to the drum brakes in the rear but the rears don't do as much work as the front discs.

I have seen some cases where the MC to prop valve, they were bigger than the rest of the system. Still from the prop valve to the brakes they would be one of those two listed above.

[oldblue1968chevy]

ok i looked on the label its 1/4" line, imma get some more today though. 3-16? right

[oldblue1968chevy]

right now i have 1/4 on everything but prop valve to wheel calipers (FRONT)

so its ok to leave the 1/4 lines from mc to prop valve alone?

[lolife99]

Did you ever figure out your front brake caliper issues?

[cparman]

YEP. If you go to MP brakes site you will find a page that describes what you should have ( line size) for a disc/drum set up. If you were to look at a 72 truck you will see 3/16 front and 1/4 rear. It just works brother! Get busy!

Originally Posted by oldblue1968chevy

So ya sure on the lines? I got bigger lines going to rear than the fronts..

[ERASER5]

Save your self a lot of aggravation and get the Ni/Cu line at AutoZone. You will thank me later.

[chevy_mike]

Originally Posted by oldblue1968chevy

right now i have 1/4 on everything but prop valve to wheel calipers (FRONT)

so its ok to leave the 1/4 lines from mc to prop valve alone?

It's not ideal but yes it will work fine. As long as you have 3/16" from the prop valve to the front calipers, you'll be fine.

[oldblue1968chevy]

lolife-No front lines were slightly kinked, im hoping that was it, idk though.

I have 1/4 on the rear everything

1/4 on Mc-prop valve

3/16 from prop vavle to wheel calipers (FRONT)

imma try to bleed em today i'll letchall know how it goes