FS Digest

I have a light rod and the line that it came with is 4 pound mono the last time I went fishing I lost 2 out of the three treble hooks that I used I’m not sure if it was my knots or the type of line or the weight so I’m thinking on re spooling the reel but I don’t know if it would be a good idea

--
by outlawcreature9977

FixorFish Loc: SW Oregon

It's usually easy to tell, when you break off, the end that comes back will be straight. If your knot failed (came undone, slipped) there will be a "curly-q" at the end.
You didn't tell us what Zebco you have, so kinda tough to say, especially if you have sights on 30#. If it's a spincast, not sure braid is the way to go, might be better to stick with mono.
If your reel came with 4#, kinda don't think 30# is the jump, maybe 8# or 12#.
Knots are often the culprit, so learn good ones and test each outing, before you first cast.
Good luck !
(If you give the specific gear, size, type, targeted species, and type of waterway, you will get more specific answers... the really useful ones, rather than generalities, as I have attempted)

Egghead

Or just take the old line off, and put #4 or#6 back on. Old line gets brittle. 4lb line will haul in a big fish if your careful.

Gmckayak Loc: Missouri

Don't forget to wet the line to lubricate it just before pulling the knot tight. Otherwise the line over stretches and becomes thin at the knot making it weak. I had the same problem a few years back when an "old timer" told me to spit on the line. Not a problem any more.

Kerry Hansen Loc: Bremerton, WA

If you do choose to use braid, then be sure you learn correct knots for braid.

Ben Bragg Loc: Dayton Ohio

Agree 100% with KH. But no substitute for a good knot with any type of line. An old “ granny “ knot will fail big time.
What knot are you using?
Also. Mono line really don’t have a very good shelf life. It will rot . Sometimes within a season.