Brake Master cylinder bench bleed?

Tiny
CWILSON911
  • MEMBER
  • 1997 TOYOTA 4RUNNER
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 341,000 MILES
Bought a used Toyota master cylinder. When bench bleeding only one of the lines will work. I got all air out of that one but nothing from other? Please help.
Sunday, January 14th, 2024 AT 8:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,949 POSTS
It sounds like the brake master cylinder is bad, but I need to ask, there are two stages inside the master did you push through both stages? Here is a video and guide to help us see what's going on:

https://youtu.be/WDxvEQrMkBg?si=uLb1B7BxT_X-6SMj

and

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Please upload pictures or videos of the problem so we can see what's going on.
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Sunday, January 14th, 2024 AT 1:36 PM

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