Brake light came on and pedal went all the way to the floor a couple days ago on my 1980 Buick Regal. Went ahead and got a new master cylinder to install. Followed a YouTube video and did a bench bleed on it before installing, seems like I followed everything correctly but after installing and trying to bleed the rear drums, no fluid came out of them. Found a thread on here that it could be the proportioning valve and some kind of safety feature within that? Wondering if I should start there or if anyone has other advice.
Thanks
Thanks