Review on 🔧 ACDelco Professional 18M67 Brake Master Cylinder Assembly: Efficient and Reliable Brake Performance by Mark Adlesh

1986 E150 Van has over 300,000 miles and the mechanic is gone. Installs in 20 minutes per minute, very easy. Of course, I didn't read the instructions, but this time it helped. It's also worth mentioning that I've been involved with cars since the 70's; grumpy old geezer could be me :) Anyway, disconnect the wires, unscrew the master, if you have a shift knob there are four nuts and unplug the master. Do not remove the tank cap. Install a new master, do not connect the lines yet. Pour liquid into two reservoirs and pump the pump until liquid comes out of two inlet lines; This fills the master cylinder. It took a while but eventually the air gets pumped out but you end up on the ground with some brake fluid. With two people, one of whom is watching, everything goes faster than running back and forth and checking. My front reservoir filled first, and as soon as that happens, fluid spills out at the top as the brake pedal returns to its original position. I just screwed the cap on the tank to keep it from splashing. Once both reservoirs are full, connect the brake lines, pump up the brakes to make sure the pedal is stiff and you're good to go. Since the brake lines aren't sucking in air and you're deflating the Master, no air should get into the line. You will notice when the pedal softens and in the worst case you will have to bleed the lines; mine seems ok. If you are having trouble pumping the Master, try using a syringe to force liquid through the Master. I hope you liked my dissertation :)