Bench bleeding creates leak at rear seal

1988 TOYOTA PICKUP
300,000 MILES • 2.4L • 4 CYL • 2WD • MANUAL
Avatar
PUMPKINTRUCK79
  • MEMBER
  • 2 POSTS
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?
Dec 11, 2020 at 4:15 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 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
Dec 11, 2020 at 4:29 PM
Advertisement
Avatar
PUMPKINTRUCK79
  • MEMBER
  • 2 POSTS
Brakebest Select is the newest one from O'reilly's. Other 3 from Advance were remanufactured.
Dec 12, 2020 at 5:41 AM
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
I would get a better brand.

I attached a Raybestos from Rock Auto for you.

Roy
Image (Click to enlarge)
Attached Media
Dec 12, 2020 at 5:46 AM