Shimano olives, is there a too tight?

Building a new road frame up.  My brake hoses have inline connectors.  One seems to have attached fine, the other was weeping fluid.  I nipped it up tighter, but after bleeding and a few squeezes on the brake it started weeping again. I’ve now cranked it as tight as possible and it seems to be holding, but I’m worried I’ve crushed the olive too much, is this possible?

I’m out of olives and fluid (more on way) and would really rather not bleed again, though this may be the least of my issues if the seal has gone in the calliper  I popped the piston out of (bleed block fell out and I noticed too late, piston popped back in so keeping fingers crossed).

Fun story,
my brand new GRX 8100 dropper/brake lever seemed to be missing its olive, no problem as I had a bag of spare uns.
Hose was just the right size out of the box, joy.

Barb and olive installed I proceeded to nip it up, no torque wrench?no problem as I’m an experienced fetler.

Couldn’t spanner the olive home, scratched my head and thought ‘I’ll give it one extra little turn’

Shattered the assembly as I didn’t see the new olive was already installed inside the assembly.

Cost £150 for a new one ☹️

You can sometimes reuse a secondhand olive if you wrap it in PTFE tape.
Defo works with mineral/shimano, not sure if it works with dot/scam

Oreetmon- old olive definitely removed, cut off with old barb and the one on there is a new one.  Just worried I’ve now over tightened it (it felt pretty tight the first time, and then tighter the second time).  I did back off the connector and gave the hose another push in before tightening again.

You cant overtighten an olive if its seated properly – thats what the barb is for, to prevent the olive crushing the hose. Well I say you can’t, I guess you could, but I’d expect you to strip threads before the barb gave up.

Thanks Ben, that’s encouraging.  Hopefully the olive will hold this time then!

Excuse the obvious question, but are they the correct olives?

I only ask as i mixed up some shimano olives and some magura olives back in the day, and they were minutely different. caused no end of grief.

If you think youve got it seated, there should be no issue pulling it out and checking it. Is it square, has it been evenly deformed.

Had exactly this issue. Turned out the preinstalled olive had somehow skewed when installing causing it to mangle on the inside of the lever. I complained to bike-discount and they helpfully had it professionally removed at no extra cost.

I used sram olive and screw in barb on a shimano xt lever before with no issues.

Deffo Shimano olives with the correct barb, it just felt like I was needing to use more force than normal to get to a point of no leak.  This is at an inline hose connector (rather than a lever thankfully, so if parts are damaged it’s a cheap fix), so it may be that I’m used to tightening against levers clamped to the bars (when doing hoses into the brake) rather than using 2 x small spanners which I need to do for this one.

Will give it another test with some hard lever squeezes later.  Just as well it’s too icy to take it on the road anyway and have some new olives and fluid on the way just in case I need to re-do.