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Jul 21st, 2025 | | | | Joined: Jul 2011 Posts: 5 New Guy | | New Guy Joined: Jul 2011 Posts: 5 | Any help would be appreciated to better understand the following circumstance.
The brakes on my 1958 Viking C40 were working great. Then work was done on something unrelated, but the truck idled for 15-20 minutes. Later when trying to move the truck there were absolutely no brakes. The master cylinder was bone dry, but no evidence of leaks on the ground or stains on the tires. After filling the master cylinder the brakes needed to be pumped to respond. But after using a pressure bleeder, the pedel is back hard and the brakes are functioning as before. No leaks were found while the system was on pressure bleeding.
Is there some way the fluid could get sucked onto the vacuum side of the Hydrovac? This is a very discomforting mystery.....to have brakes and then have them suddenly not work with no apparent reason.
Need help. Thanks!
Keith | | | | | Joined: Dec 2006 Posts: 92 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 92 | Hi Keith. The brake fluid can in fact get to the vacuum side of the hydrovac. To check to see if this is what happened to you, pull the vacuum hose off where it's connected at the hydrovac. If there is evidence of brake fluid, that is probably your culprit.
Paul.
1948 Chevy 6400
1964 Chevy 1/2 Ton
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