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Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 7:51 pm
by cbez
The splitter/switch on the firewall and the fitting to the clutch master are both giving us headaches. The incoming line and the bottom line on the fitting are both leaking. all the fittings are down tight (probably too tight...)
Gonna take everything out tomorrow, check the flares and the unions.
Never had an issue with DOT 5 before.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 7:56 pm
by JT68
Its not the brake fluid.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 8:00 pm
by cbez
JT68 wrote: Fri Aug 06, 2021 7:56 pm
Its not the brake fluid.
that's my thought too...gentleman I'm working with thinks its junk but I've never had a problem getting it to seal up or get a good brake pedal.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 8:26 pm
by redroadster
I did a line double flare not long ago ..it took me 6 times to get it right . And I've done ? 8-9 cars
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 8:43 pm
by cbez
redroadster wrote: Fri Aug 06, 2021 8:26 pm
I did a line double flare not long ago ..it took me 6 times to get it right . And I've done ? 8-9 cars
I am told they are original lines that have been cleaned up and zinc'd.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 9:16 pm
by JT68
cbez wrote: Fri Aug 06, 2021 8:00 pm
JT68 wrote: Fri Aug 06, 2021 7:56 pm
Its not the brake fluid.
that's my thought too...gentleman I'm working with thinks its junk but I've never had a problem getting it to seal up or get a good brake pedal.
the only folks I know who have problems with it try to bleed too fast. From what I've seen it forms smaller bubbles than conventional Dot3-4 which are more difficult to eliminate. The key is push the pedal SLOOOOW..if you pump it quickly, you will chase your tail for hours. Then let it sit overnight and re-bleed. Kind of tedious, but better than repainting an engine compartment IMHO.
(I have to redo an engine compartment this fall ruined by some dot3. That's way more annoying than extra bleeding.)
Another possibility...with the original fittings and junction blocks, I've seen situations where the threaded fitting is VERY tight in the block, but not clamping the line so well. If the fittings are difficult to turn, the threads may need to be chased (and then cleaned very well of course). You would need a 3/8-24 bottoming tap and a 3/8-24 die.
yet another possibility, if over tightened, the mating fittings of the junction block may be damaged. You would need a replacement block in that case.
hope this helps!
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Fri Aug 06, 2021 10:02 pm
by cbez
JT68 wrote: Fri Aug 06, 2021 9:16 pm
cbez wrote: Fri Aug 06, 2021 8:00 pm
JT68 wrote: Fri Aug 06, 2021 7:56 pm
Its not the brake fluid.
that's my thought too...gentleman I'm working with thinks its junk but I've never had a problem getting it to seal up or get a good brake pedal.
the only folks I know who have problems with it try to bleed too fast. From what I've seen it forms smaller bubbles than conventional Dot3-4 which are more difficult to eliminate. The key is push the pedal SLOOOOW..if you pump it quickly, you will chase your tail for hours. Then let it sit overnight and re-bleed. Kind of tedious, but better than repainting an engine compartment IMHO.
(I have to redo an engine compartment this fall ruined by some dot3. That's way more annoying than extra bleeding.)
Another possibility...with the original fittings and junction blocks, I've seen situations where the threaded fitting is VERY tight in the block, but not clamping the line so well. If the fittings are difficult to turn, the threads may need to be chased (and then cleaned very well of course). You would need a 3/8-24 bottoming tap and a 3/8-24 die.
yet another possibility, if over tightened, the mating fittings of the junction block may be damaged. You would need a replacement block in that case.
hope this helps!
Thanks! My brain was saying it can only be the flare, threads or block but I was praying for a magic trick haha.
My thoughts exactly on the silicone. We already leaked down the firewall by the master AND the junction. It already paid for itself.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Sat Aug 07, 2021 11:08 pm
by cbez
OK well here was the main culprit:
No idea how the flare ended up like this. But, we reflared it and cleaned up a new junction. At some point in all that the bottom was able to seal up also.
Interestingly we found 2 versions in the parts pile. One with smaller passages and less threads on the female ports, and one with bigger passages and fewer threads. Identical from the outside. Not sure if one style is 1500 and one is 1600 or what.
Clutch master fitting still has a tiny seep despite the flare looking good and being in pretty tight. I'll have to take it apart and try again soon.
Re: Anyone got leaky brake fitting tips before I tackle tomorrow?
Posted: Sun Aug 08, 2021 1:22 am
by redroadster
That's what it looks like with the 1st step creating the double part , then use the flair wedge to flair it , which looks like they forgot to do , easy to forget
Also sometimes it takes much more strength to get the flair than other times