Bench bleeding creates leak at rear seal

Tiny
PUMPKINTRUCK79
  • MEMBER
  • 1988 TOYOTA PICKUP
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 300,000 MILES
On my third new master cylinder, and bench bleeding is causing the rear seal to leak on each one. Any idea what I can be doing wrong?
Friday, December 11th, 2020 AT 4:15 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Good evening,

You are doing nothing wrong.

That seal should not leak at all. You need a different brand master cylinder.

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

What brand master are you using?

Roy
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Friday, December 11th, 2020 AT 4:29 PM
Tiny
PUMPKINTRUCK79
  • MEMBER
  • 2 POSTS
Brakebest Select is the newest one from O'reilly's. Other 3 from Advance were remanufactured.
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Saturday, December 12th, 2020 AT 5:41 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
I would get a better brand.

I attached a Raybestos from Rock Auto for you.

Roy
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Saturday, December 12th, 2020 AT 5:46 AM

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