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| | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | A few months ago, I bled the brakes and hydrovac on my 1950 GMC 2 ton and noticed the brake pedal was very hard to push and would only go down about an inch and I moved on to other more fun things to work on. Today I had to test run it again  and the brake pedal would go nearly to the floor so I checked the fluid and it was almost empty so I refilled it and checked all around for leaks but didn't see anything. Everything in the brake system except the hard lines is new and the engine was just professionally rebuilt. Where did the brake fluid go? | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | these things lose fluid cuz the master cap is vented, but is the bladder on the hydrovac letting it into the air chamber?
Bill | | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | I'm not sure. Is there an easy way to check? | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Take the vacuum hose off at the booster & see if fluid is in there.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | now did I say brake fluid evaporated :confused: it most likely does, as most things that are liquid and go thru heating cycles do 'vaporize', tho I was thinkin more of expansion and moisture-laden air displacement prolly - the reason rust happens so easily in these old open systems, and fluid should be changed ocassionaly - ever notice the master cyl and surrounding area is always rusty? - I do think it's most likely to be the hydrovac in this case [providing everything was bled completely], where it sounds like the truck hasn't been used much, and ya'll must be aware of the tech-tip here about those Bill | | | | | Joined: Dec 2003 Posts: 265 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 265 | Thanks for the help guys. I climbed under today and checked the air chamber and it was as dry as a bone. I also got all four wheel cylinders adjusted and the park brake cables back on. Everything seems to be working OK but it will be a while before I get the sheet metal back on and can take it for a test run. I'll keep an eye on the brake fluid. | | |
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