Did you happen to use a National tool installer to install our seals? That tool will damage our seal, a Stemco seal, and SKF seal, and any other seal. Having said that, we do pay for the brakes (and sometimes the labor) if our seals fail. So long as the installing technician takes out free online. 30 minute training course.

I got tricked into buying these from fleet pride for my 20 ton tag trailer and 3 of the 4 seals started leaking the first day. The 4th one started leaking a couple months later. I have used national seals on my trailer for the last 10 years and never once had a leak. Nothing is more frustrating than tearing apart a hub brake setup to do it all over again a couple days later.