# corroded brake booster/leaky brake MC

**URL:** <https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828>\
**Category:** SON240sx Automotive\
**Created:** [May 23, 2007, 8:26pm UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828 "2007-05-23T20:26:34Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\
**Post date:** [May 24, 2007, 3:13am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/2 "2007-05-24T03:13:47Z")

</div>

> [@got a bike!](https://forums.speedlife.net/t/got-a-bike/12679/17):
>
> i lose about half the brake fluid in the master cylinder reservoir each month. i changed both the MC and brake booster last year because of the same problem. the paint on the tower/frame under the MC and brake booster is all eaten away and i’d just like to know if the cause is from a faulty master cylinder or brake booster or both. thanks.
> 
> -Roel

as with all disappearing fluid… follow the leaks… if there are no leaks that also tells us something… leave a sheet of newspaper under the car held down with tape

check the slave cylinder? are the soft lines weeping?, any drips on the driveway?

---

_[View the full topic](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828)._