Hi. I haven't posted in a while, but I still have my Buick. Have Powermaster brakes. Today I changed some of the brake fluid out in the reservoir with the turkey baster. Pumped the brakes 10 times with the car off, then turned the ignition on to listen for the brake filling sound. Done this many times before. Now I have no brakes. I looked back in the reservoir and it was too full. I took some fluid out but stll have no brakes. How do I know what part to replace? The switch or the bowl or both? Thanks for any help.