Originally Posted by
wiredgeorge
You aught to know what type calipers it has. Brake pad material can make all the difference if the brakes are not spongy. If spongy, put speed bleeders on them and use a MityVac and suck out as much as possible then bleed the little remaining with just the speed bleeders. The two brakes off one m/c means there is a good possibility of air still int he system. Sometimes it seems almost impossible to get all the air bubbles out. If the pedal is firm, you have good pads, time to look at a m/c with larger diameter plunger. If you are using the original and it was intended to provide hydraulic pressure to one pot and you now have four, then it may not be large enough diameter.