I recently installed a Wilwood Tandem Master Cylinder (part number 261-13270) and an adjustable proportioning valve in my 1972 Chevelle. My car came with power disc up front and drum in the back. I got the brakes bled, bench bled the master multiple times but still could not get a good pedal. Ended up being the booster pin to master cylinder gap was out of adjustment.
Here is the tool I purchased on eBay from seller tomsclassic: [ Ссылка ]
I received no compensation to post this video.
Hopefully this saves someone the headache it caused me. Of course, make sure you have the proper bore size for your application, and make sure there are no leaks anywhere or air in the lines.
