| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,094 Posts1,056,051 Members48,433 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | If you're checking the Hydrovac for brake fluid by removing the small plug on the back of the piston can you're looking on the wrong side of the piston. That side is the fresh air side and the vacuum side is between the piston and the hydraulic cylinder so the fluid may be trapped and the piston seal is keeping it out of the fresh air side. If the vacuum side has fluid in it the engine will smoke as it sucks it up the vacuum hose. Remove the hose at the engine and see if it's wet on the inside. Mike B  | | |
|
|
| |
