# Leak from rear of new master cylnder

**URL:** <https://community.cartalk.com/t/leak-from-rear-of-new-master-cylnder/100561>\
**Category:** Maintenance/Repairs\
**Created:** [February 28, 2017, 2:15am UTC](https://community.cartalk.com/t/leak-from-rear-of-new-master-cylnder/100561 "2017-02-28T02:15:44Z")\
**Posts on this page:** 1\
**Showing post:** 25

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**Author:** ![Jack-Dak87](https://avatars.discourse-cdn.com/v4/letter/j/c6cbf5/32.png) [@Jack-Dak87](https://community.cartalk.com/u/Jack-Dak87)\
**Post date:** [February 28, 2017, 9:37pm UTC](https://community.cartalk.com/t/leak-from-rear-of-new-master-cylnder/100561/25 "2017-02-28T21:37:49Z")

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Just remembered running across this yesterday:

"Does your 4Runner have rear drum brakes instead of discs? If so, worn or out of adjustment rear brake shoes can cause a low pedal and even mimic a failing master cylinder."  
[Low brake pedal after new pads and bleeding?](https://community.cartalk.com/t/low-brake-pedal-after-new-pads-and-bleeding/88939/4)

I just installed the brake shoes yesterday. Cleaned and lubed the threaded self-adjusting mechanisms, and adjusted to just allow the drums to be installed. I figured that the self-adjust mechanism would fine tune it. I didn’t turn the drums and the shoes need to wear in.

After pedal sinks, one or two pumps brings it right back. And as I mentioned in another reply, the pedal never loses braking power. It sinks just so low and no lower.

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_[View the full topic](https://community.cartalk.com/t/leak-from-rear-of-new-master-cylnder/100561)._