homedad wrote:
I had the extensions on my rear duals. I found that if they've been on a long time the valve that the extension is pushing gets stuck open. You need to bite the bullet and let the air flow and deal with the stuck valve. I found that it's fine with the extensions on but if it's flowing just re-seating the valve with a pressure gauge or pointy object re-seats the valve. Then refill the tires. The cheap solution I found was the 135deg stem extension on the outers and just using the braided extension as a temporary extension for checking and filling the inners. You'll need a flashlight to find the valve and need to leave the cap off. I had too much anxiety putting the braided lines on permanently.
Leaving the cap off is not recommended. Modern caps provide a seal and a backup in case of valve failure. They also prevent the possibility of dirt getting into the valve stem and causing a leak.