dgdarien

Flushed out the brake fluid with the standard brake bleeding procedure. (Did not bleed the ABS though because the Helm's did not mention to do it.)

There was a little evidence of air bubbles in the line but I flushed them out. But the brake pedal still feels mushy and will tend to drop the floor a bit. Does this mean the Master Cylinder is definitely defective or are there other possibilities?

boosting sol

i would say the master cylinder

killahatch

did u mess with ur rear drums? cuz after u change them you gotta adjust them. cuz i had a really low pedal feel wen i did mine cuz i didnt adjust them. i hope this helps.

[713]

this

dgdarien

Is this the definitive answer? Is there any other possibilities before I replace this part?

RyanA

If the brake system is "tight" and there are no leaks, everything points to a bad master cylinder. If you have air in the system, the pedal will be spongy or low but it will not drop to the floor over time. There are only 2 things that will cause the pedal to drop to the floor. 1. external leak in brake system evidenced by fluid leaking out. 2. master cylinder leaking internally, causing the pedal to drop to the floor. It can also leak externally; if it's leaking externally, you will probably notice a run of brake fluid where the master attaches to the booster cylinder.