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7 members (Gdads51, MickeyP, 1955 1 Series, thekid1950, RoadsScholar, tclederman, klhansen),
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guests, and
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Global Mod,
Mod | | | Forums66 Topics128,081 Posts1,056,068 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!
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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: Apr 2011 Posts: 10 New Guy | | New Guy Joined: Apr 2011 Posts: 10 | I have a '52 GMC that has a cable-operated hydraulic brake valve at the end of the hydrovac unit. It is used when operating the fire pump. The knob is pulled at the dash, and the cable pulls the lever about 90 degrees. This "locks" the pressure in the brake system, providing a "parking brake" effect. The normal parking brake squeezes the drive line, which needs to spin for pumping the midship fire pump.
Question: What is this unit called, and how can I fix the leak from the shaft (comes out of the valve and has the lever attached to it. I am tired of losing brake fluid.
Thanks! | | | | | Joined: Apr 2011 Posts: 10 New Guy | | New Guy Joined: Apr 2011 Posts: 10 | Thank you. I was looking at replacing it with the "cable lock" they sell, until I found out it retails for $990.
I'll try to find the right rubber seals and copper discs so I can repair it (hopefully).
I appreciate the help!
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