Alfa Romeo Bulletin Board & Forums - View Single Post - White smoke from tailpipe on hard left turn
View Single Post
post #9 of (permalink) Old 05-16-2019, 01:57 PM
But Mad North-Northwest
Platinum Subscriber
Gubi's Avatar
Join Date: Sep 2003
Location: SF Bay Area, CA
Posts: 9,659
Originally Posted by davbert View Post
leaky booster/mc or not... i reckon the reason brake fluid is coming out of the tail pipe as white smoke is the check valve from the intake port to booster has failed allowing fluid into the motor.

the check valve is the silvery thing that on the intake manifold runner closes firewall with hose attached to it. disconnected it, plug the hole and drive it to test it to see if it still smokes. be extra CAREFUL since your pedal effort has doubled or tripled without the vacuum assist.
That's not how the check valve works. The check valve allows flow from the booster to the engine. If there's fluid leaking into the booster it'll get into the engine even with a perfectly functional check valve.

The check valve is there so if the engine shuts off or you've got low engine vacuum you still have vacuum stored in the booster to enable power brakes.


1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
Gubi is online now  
For the best viewing experience please update your browser to Google Chrome