BRITAX ONE4life strap issues can’t tighten


New member
We have 2 of these and one has never worked right. No matter how hard I pull the straps will not tighten enough to secure my son when he is in the seat. If he’s not in the seat it works fine? I’ve taken the car seat out multiple times to try and figure out the issue and can’t. It’s especially strange that it works without him in it but when he’s in the seat it won’t tighten well. And trust me, I’ve pulled with both hand using my leg up to get as much force as possible. Any ideas?


CPST and ketchup snob
Staff member
Hi! Have you followed the harness straps from one end to the other to make sure they aren't caught up on anything? I would also sit the seat next to the one that works and compare it to make sure they look the same. If you've done those steps and all seems as it should be, I would advise calling Britax for help.

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