[Asshat]

Originally Posted by caseyjones

I’ve had a similar problem when I didn’t properly bench bleed the master cylinder. I’ve also had the misfortune of tripping the proportioning valve safety feature because I did t lock the piston in place before attempting to bleed the system. That electrical connection on the valve is a switch that engages when the valve closes due to a leak or lack of fluid in one half of the system. When first filling and bleeding the system you need to lock the valve in place with a little tool like this:
https://www.amazon.com/WISPAUSU-Comp...70711188&psc=1

If the brake lines are removed and the fluid drains from the rear brake lines, do I need to bench bleed the master again?

Also, I would think the proportioning valve is not tripped since I get fluid from all calipers.