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BUSY BOLTERS Are you one?  The Shop Area
continues to pull in the most views on the Stovebolt. In August alone there were over 22,000 views in those 13 forums.
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Mod | | | Forums66 Topics126,776 Posts1,039,277 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | Joined: Jul 2008 Posts: 86 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 86 | When replacing the master cylinder on a truck with a hydrovac, do all the brake lines need bled or just the line from the master cylinder to the hydrovac? | | | | | Joined: Sep 2006 Posts: 1,972 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,972 | According to the manual (you can see it online at http://chevy.oldcarmanualproject.com/shop/1954truck/index.html) if you work on the hydrovac, you need to bleed the entire system. I sure would anyhow. Basically you are adding air to a closed system.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Jul 2008 Posts: 86 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 86 | Thanks! I have an experienced GMC mechanic that will be doing most of the work, but wanted to know just what to expect. | | | | | Joined: Jan 2008 Posts: 165 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2008 Posts: 165 | Once you bench bleed the new master cylinder you would normally need to bleed only thru the hydro vac, really shouldn't need to bleed all wheels, but it wouldn't hurt to do that as you'll get new clean fluid throughout. | | |
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