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Mod | | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | 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!
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| | | | Joined: Oct 2005 Posts: 43 'Bolter | | 'Bolter Joined: Oct 2005 Posts: 43 | Does any one know what is the best fluid additive for the diaphram in the hydrovac brake system? The manual talks about adding fluid to the breather but my local Napa store is not sure what to use. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy ROUGIE, I think the fluid is called Bendix vacuum cylinder oil, if they can't find that ask them what they sell for vacuum pumps which diesel engines use to create vacuum for their brake systems. Hope that helps. | | | | | Joined: Sep 2006 Posts: 1,276 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 1,276 | | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I think I have heard castor oil, like from the drug store.
Anyone else heard that? | | | | | Joined: Mar 2005 Posts: 2 Junior Member | | Junior Member Joined: Mar 2005 Posts: 2 | Permatex Hydraulic Jack Oil #78E is supposed to be similiar to the old hydrovac oil and is more readily available. | | |
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