Small hole on replacement magura louise lever

olryst
olryst Posts: 48
edited February 2012 in MTB workshop & tech
I've recently had to order a new magura louise lever.

I noticed it now has a samll hole level and to the side of where it says mineral.

Anyone know what this is for?

Thankyou.

Comments

  • nicklouse
    nicklouse Posts: 50,673
    A breather? Pics?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • olryst
    olryst Posts: 48
    Here is pick of magura louise lever with small hole, next to the word mineral.
  • nicklouse
    nicklouse Posts: 50,673
    It will be a breather.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • olryst
    olryst Posts: 48
    Breather?
  • nicklouse
    nicklouse Posts: 50,673
    Yes. You other lever will have one somewhere as well.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bikaholic
    bikaholic Posts: 350
    It allows the hydraulic fluid to expand and contract as it heats up and cools down. Usually, a rubber membrane in the master cylinder of the lever seals the fluid inside the system - it's the membrane that expands and contracts.

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