Question about fitting brake lines, small leak under pressure.

[meep]

Helping a buddy - 1965 Chevy. Had to install a new master cylinder. The single brake line outlet was in the front instead of the side, so he also ordered the oem shape brake line to fit the MC outlet. After rebuilding the RR caliper, he gets a firm pedal. BUT, there is a Very Slight fluid leak under pressure where the new flare fitting screws into the distribution block. I grrr’d on it super tight, and when it still leaked under pressure, grr’d past my feel for what‘s appropriate. It helped a small little. It’s a flare fitting.

we did have to wrestle with it to get it in place and lined up well enough to thread it. Practical advice?

the leak is small…. You can hold the pedal for a minute and *might* perceive pedal sinking, but the fluid immediately shows at the fitting upon pedal press.

 

[GSCJR]

Threads need a closer examination for damage, is what I suspect.

 

[Accent Abuser]

Something is wrong with the threads or the flare fitting, brake lines do not need to be very tight to hold pressure and just ham fisting it on tighter will not help.

 

[Chris142]

Can't have any leaks. It will suck air and cause no brakes.

 

[clinebarger]

Try loosening the nut & tighten it again. Push comes to shove.....You may need the re-flare the end and/or replace the Block as the seat in the Block might be distorted.

 

[Lubener]

May have been overtightened.

 

[meep]

Thank you all. We plan to back it out and have another go at it.
- threads are silky smooth the whole way
- we were wondering how sensitive these are to the lines being “perfectly bent” - we had to hold a little tension on it to get it to thread smoothly. are they sensitive to that?
- will also take a look at the block.