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Vacuum leak between Master cylinder and brake booster?

Tiny
KEVIN ARJUNE
  • MEMBER
  • 2003 TOYOTA VIOS
  • 999,999 MILES
The brake booster and master cylinder were replaced (not sure if it was replaced with the original). After a month, we observed that the check engine light was on. The car was scanned, and the fault P0171 was found meaning system too lean bank 1. We found there is a vacuum leak between the master cylinder and brake booster. The master cylinder was removed, but there is no gasket or o-ring seal. Shouldn't there be one?
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Monday, April 1st, 2024 AT 8:02 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

This vehicle isn't offered in the US, but I did some research. There should be an o-ring between the master cylinder and the booster. I attached a pic of what I found below.

Let me know if this helps.

Take care,

Joe

See pic below.
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Monday, April 1st, 2024 AT 4:25 PM
Tiny
KEVIN ARJUNE
  • MEMBER
  • 3 POSTS
Hi Jacob, thanks for your support. The image u attached is not the system I have. I have attached the info of the one I have, can you please provide the drawing as you did previously for this one? Thank you
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Monday, April 1st, 2024 AT 4:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

When I look up the number from the pic you provided, it takes me to a 2005 Toyota Camry. This is what makes it hard for me without having the specific info in a manual.

Take a look at the pic I attached and let me know if that looks correct. That is a 2005 Camry set-up.

Joe
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Tuesday, April 2nd, 2024 AT 10:27 AM
Tiny
KEVIN ARJUNE
  • MEMBER
  • 3 POSTS
Yes, this seems to be correct, according to the drawing there is no gasket or o-ring between the Master Cylinder and booster therefore there shouldn't be a vacuum leak. It's most likely a bad booster. Thanks for the support.
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Tuesday, April 2nd, 2024 AT 10:45 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,262 POSTS
Hi,

I believe there should be an o-ring there. Have you tried checking with a dealer?

Joe
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Wednesday, April 3rd, 2024 AT 6:19 PM

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