Me and a friend are working on reviving a 2001 Mitsu Eclipse that had a hard time starting(IAC isn't working - it starts and idles OK when it's warm, I'll clean the idle air passages first before throwing a new IAC valve) and has a constant soft pedal.
I filled up the reservoir with DOT 3 after sucking out the old stuff and I had someone inside the car pump and hold the pedal while I cracked the fittings loose at the MC to bleed it out. The pedal did firm up and drop again - I repeated this a few times. I didn't check the rest of the brake system but my plan once I get a new gasket for my Motive Power Bleeder is to pressure bleed and flush the brake system, replace the pads and rotors and inspect the hard/soft lines and rear wheel cylinders/front calipers for leaks.
If the rest of the brake system is bled and leak free, would the master cylinder be at fault - but wouldn't a internally leaking master cylinder also result in brake booster failure and a hard pedal since brake fluid destroys the diaphragm and you can't compress a liquid?
I filled up the reservoir with DOT 3 after sucking out the old stuff and I had someone inside the car pump and hold the pedal while I cracked the fittings loose at the MC to bleed it out. The pedal did firm up and drop again - I repeated this a few times. I didn't check the rest of the brake system but my plan once I get a new gasket for my Motive Power Bleeder is to pressure bleed and flush the brake system, replace the pads and rotors and inspect the hard/soft lines and rear wheel cylinders/front calipers for leaks.
If the rest of the brake system is bled and leak free, would the master cylinder be at fault - but wouldn't a internally leaking master cylinder also result in brake booster failure and a hard pedal since brake fluid destroys the diaphragm and you can't compress a liquid?