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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!
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| | | | Joined: Feb 2006 Posts: 16 Junior Member | | Junior Member Joined: Feb 2006 Posts: 16 | The 1941 COE my dad and I are currently working on has an oddity I have never seen before. Under the driver's side of the cab is something that looks like a hydrovac, but isnt! It is some sort of vacuum brake assist that pulls to amplify the power you apply to the brake pedal. There is no fluid in it or going to it. Just a lever that activates it. Has anyone ever seen one of these on one of thier bolts? Was this an option? | | | | | Joined: Oct 2003 Posts: 363 Member | | Member Joined: Oct 2003 Posts: 363 | | | | | | Joined: Feb 2006 Posts: 16 Junior Member | | Junior Member Joined: Feb 2006 Posts: 16 | It's kinda hard to get a picture of it under the cab, but I will try. | | | | | Joined: Jul 2005 Posts: 71 Member | | Member Joined: Jul 2005 Posts: 71 | simbalion
I haven't seen one, but I know vacuum boosters were available (aftermarket) for early mechanical brake trucks.What you have must be a step on from these. | | | | | Joined: Nov 2001 Posts: 481 Shop Shark | | Shop Shark Joined: Nov 2001 Posts: 481 | I have a 1945 1 1/2 ton GMC COE with a vacuum assist hydrovac. Standard equipment.
A 1941-46 shop manual gives all the hook-up and rebuild information. | | | | | Joined: Jan 1970 Posts: 365 Shop Shark | | Shop Shark Joined: Jan 1970 Posts: 365 | The 1942 1.5 ton I sold to JLucas has such a brake booster on it and it does work. It helps considerably with pedal effort. | | | | | Joined: Nov 2005 Posts: 355 Member | | Member Joined: Nov 2005 Posts: 355 | so are there any pic's of this setup? | | |
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