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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: May 2008 Posts: 5 New Guy | | New Guy Joined: May 2008 Posts: 5 | When i am bleeding the brakes can someone tell me what causes the fluid to come back out the master cylinder? i can't seem to get anything out of the top valve on the hydrovac. Can it be pressureizing itself inside the can? | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy mem, a little geyser out of the master cylinder when bleeding the brakes is normal, it happens when the piston seal uncovers the compensating port, on it's way back to the at rest position. I would remove the upper bleed screw on the hydrovac, and make sure it is not plugged solid with dirt, hope that helps. | | |
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