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Starfire61 · 02-09-2008, 03:30 PM

Tom- The valve goes between the carburetor & the brake booster. It helps to maintain a relatively constant level of vacuum at the booster regardless of throttle position.

There's not supposed to be a check valve between the booster & the fender vacuum tank. If there were a valve there, one of two things would happen (depending on how the valve was oriented)- either you couldn't apply vacuum to the tank, OR vacuum would be trapped in the tank & couldn't be applied to the power brake booster.

If you have brake fluid in the tank, then you likely have bad seals in the master cylinder that leak fluid into the booster. Was your brake booster full of fluid, too? Check your master cylinder bore. If it's pitted it can chew up even a new set of seals fairly quickly & you'll be right back where you started.

If you have the original master & want to keep the car looking stock, you can have the cylinder bored & sleeved to the original diameter. Since the car's all apart it would also be a good opportunity to have the booster rebuilt.

Chuck Tuma

02-09-2008, 03:30 PM	#4 (permalink)
Starfire61 Member Join Date: Dec 2006 Posts: 59	Tom- The valve goes between the carburetor & the brake booster. It helps to maintain a relatively constant level of vacuum at the booster regardless of throttle position. There's not supposed to be a check valve between the booster & the fender vacuum tank. If there were a valve there, one of two things would happen (depending on how the valve was oriented)- either you couldn't apply vacuum to the tank, OR vacuum would be trapped in the tank & couldn't be applied to the power brake booster. If you have brake fluid in the tank, then you likely have bad seals in the master cylinder that leak fluid into the booster. Was your brake booster full of fluid, too? Check your master cylinder bore. If it's pitted it can chew up even a new set of seals fairly quickly & you'll be right back where you started. If you have the original master & want to keep the car looking stock, you can have the cylinder bored & sleeved to the original diameter. Since the car's all apart it would also be a good opportunity to have the booster rebuilt. Chuck Tuma Last edited by Starfire61 : 02-09-2008 at 03:37 PM.