Bad master cylinder symptoms - ABS light comes on under pressure -

[GWerks]

So last night I bled the brakes using the two men way, and I still got the same spongy feeling on the brake pedal, so I decided I would bleed them by gravity, used 3 quarts of brake fluid and still the same.

I get the spongy feeling, and it's not hard to put the brake pedal to the floor, ABS light comes on when I release the brakes.

Bad master cylinder or air in the system? If the car is not running, the brake pedal feels really tight after pumping it once or twice.

[NefMoto]

Try cycling the ABS pump using VAG-COM.

I have also found going for a drive and hitting the brakes hard enough to activate ABS helps with the spongy feeling.

[Silver Bullitt]

I just did the above. After a rotor/pad change I did a brake bleed. Was spongy on the test drive. I hit the brakes on some gravel, which cycled the ABS, then bled then again. Much better now.