Brake Fluid. Shelf life?

5 replies to this topic
  • slowxr

Posted April 08, 2006 - 10:46 AM


I opened a bottle of Honda brake fluid in June. I closed the lid tightly and haven't opened the bottle since then.
Is this fluid still good to use? I've heard that it attracts moisture after the bottle has been opened.

  • DaveySprocket

Posted April 08, 2006 - 12:28 PM


Yes, glycol based brake fluid is hygroscopic, so it is designed to absorb some level (3% max?) of water. If the container has been sealed since the last use, it should be fine. However, if it is something that you will continue to wonder if it was ok to use, then just buy some new stuff. Sometimes, peace of mind is worth the $6 :thumbsup:

  • gnarly sprockets

Posted April 08, 2006 - 06:09 PM


Are you in an area that's been humid during this period? This makes a difference. I've used previously opened brake fluid that spent years on the shelf in my garage in AZ w/o problems.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • slowxr

Posted April 08, 2006 - 08:12 PM


Sounds like good advice. And yes, I'm at the beach which is pretty humid.

  • XR250rdr

Posted April 09, 2006 - 02:28 AM


If its in a plastic bottle toss it. Metal...its probably okay.

Brake fluid should be changed every year or two on a car depending on the manner of use. For a bike, really it should be done frequently (though I'm guilty of blowing it off).

  • EddyWhoGoes

Posted April 09, 2006 - 02:44 AM


Just on the shelf life issue, over to transmission oil for a moment if I may....
I use motul 10w40 2t gearbox oil in my sons '05 YZ 85, and a half full bottle that had sat for 6 months or so, untampered, sealed well, looked as if someone had poured half a cup of old diesel engine oil into it when I opened it to use it....
This blackish gunk substance had found its way to the bottom of the bottle.

Did it just need a good shake up or was I lucky I pour it in a beaker prior to pouring it into the bike ?
I disposed of it and purchased a new bottle to be safe.

My thanks in advance.

Related Content


2015 XR650L Squeaking noise by Crayjay

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 3 replies

ignitech programmable XR650L CDI by brianhare

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  60 replies

Cle Elum Sunday 5/29: Looking for dual sport tips by TigerTanker

Dirt Bike   Dirt Bike Regional Discussion   Northwest
  • Hot  32 replies

93 xr650l Restoration Project by Zigster

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 17 replies

XR650L super moto wheels by greggkklee

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  28 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.