Is this signs of a bad master cylinder?

[ShadowRejects]

My brake light came on and my brakes have sucked ever since. If i stomp on the brakes, my wheels dont even lock up, i just ease to a stop. the pedal goes all the way down to the floor and i barely have to press it..

its been getting on my nerves and I have already changed and bled my brakes. Is it the master cylinder?

 

[great white]

Sounds likely if you're not leaking....could be a bad booster, but more likely the master bypassing.

Could be the abs module. Try pulling the codes for it....

 

[MSCustoms]

Sounds likely if you're not leaking....could be a bad booster, but more likely the master bypassing.

Could be the abs module. Try pulling the codes for it....

X2 my brake light came on in the 90 and it was a brake code

 

[twomanymontes]

It sounds like you have a leak someplace. Has there been any fluid loss? A master cylinder will do that as well.

 

[KReePiN]

I had my light come on for like a month straight.....i couldnt figure it out for the life of me.....i replaced the module and all was well

 

[RHamill]

Bad brake booster causes no vacuum assist with brakes, which means very stiff brake pedal because its not holding vacuum.

 

[RHamill]

Id bleed your Brake pulse modulator valve (BPMV) with a GM tech II.

 

[ShadowRejects]

i replaced the master cylinder but its still spongy. any other suggestions?

 

[great white]

i replaced the master cylinder but its still spongy. any other suggestions?

Even money on it being air after changing the master....

 

[Smitty1021]

I had this same issue up till yesterday. Brake light was on so I bled the brakes multiple times and replaced master cylinder. It worked a little better but the brakes finally ended up going back to being spongy again after a less than a month. I talked to a mechanic and he told me to change the master cylinder again, so I spent a little more cash on a bendix mc yesterday and all seems well now. Not saying your luck is as bad as mine but it may be something to consider.