Tired of throwing parts at my Blazer brake problem. When you hit the brakes, the pedal drops half way to the floor before it stops. The tires squeel but I cna't tell if the front or rear are engaging. this thing supposely has a rebuilt master cylinder and I put another proportioning valve in there that is used but is supposed to work. I replaced the rear wheel cylinders, drum shoes, resurfaced drums and bleed them multiple times. I checked the front rotars, had them resurfaced and bleed them as well. Would really like this sob to stop better then a 61 falcon. Need someone who really knows brakes on these trucks and can walk me through the process of what to do first etc. I've looked at the books and they haven't helped me yet. The freakin brake light is one no matter what i do with the proportioning front pin thingy!!!!
HELP