Brake System Light in Dash

PS2Gamer1988 said:

I was driving home earlier tonight and saw in my 69 Mustang, the Brake System light came on for the first time. I recently just had a new master cylinder put in and the brakes gone over. I was wondering if anyone could tell me what the Brake System light means.

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Do what Worth said to find the source for the lamp to light.
If it comes from the prop block under the master cyl, there is an imbalance in the system pressure.
This will light the lamp to let you know there is a problem.
Sometimes when Brake work is done like your master replaced,
The fluid pressure is not Equal on both sides of the block.
even after bleeding the wheep cyls.
A Bleed from the master cyl will recenter the pin in the block and the light will go out.

It takes a SLOW pressure bleed off from eather the front or rear on the master to allow the pin to move to center.
with key in the on position and a watchful helpers eye on the light.

PB