'12 G37 with Brake Booster Vacuum Leak

SouthArk370Z · 11-18-2019, 12:56 PM

The FSM (link in sig) should have test procedure and more info about possible problem causes.

Dentt42 · 11-18-2019, 01:41 PM

Quote:

Originally Posted by SouthArk370Z

The FSM (link in sig) should have test procedure and more info about possible problem causes.

Looks like I may have found it:

Quote:

Originally Posted by FSM

Check the air tight condition when the master cylinder and the brake booster is installed.
1. With a handy vacuum pump, apply vacuum pressure of −66.7 kPa (−500 mmHg, −19.70 inHg) to the
brake booster.
2. If the air tight condition cannot be maintained, perform the following operation.
a. Check the no dirt and dust are present on the brake booster and brake master cylinder mating faces.
Clean it if necessary.
b. Check O-ring on the master cylinder. If anything is found, replace the O-ring.
c. Check the air tight condition again. If the condition still cannot be maintained, replace the brake booster

I'll report back. Thanks a ton!

Rusty · 11-18-2019, 09:04 PM

With the engine running. Spray engine starting fluid around the connections. If the rpms goes up. You found your leak.

Dentt42 · 11-18-2019, 09:15 PM

Quote:

Originally Posted by Rusty

With the engine running. Spray engine starting fluid around the connections. If the rpms goes up. You found your leak.

I’m familiar with the trick, but I was concerned that getting a solvent inside the booster diaphragm would cause further problems.

Rusty · 11-18-2019, 09:36 PM

Quote:

Originally Posted by Dentt42

I’m familiar with the trick, but I was concerned that getting a solvent inside the booster diaphragm would cause further problems.

If you are just spraying around the connections. It won't hurt it. You're not spraying directly on the diaphragm.

11-18-2019, 12:56 PM	#1 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	The FSM (link in sig) should have test procedure and more info about possible problem causes. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

11-18-2019, 09:04 PM	#3 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 69 Posts: 35,430 Drives: 2011 Nismo GM 6M Rep Power: 2684438	With the engine running. Spray engine starting fluid around the connections. If the rpms goes up. You found your leak. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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