I was driving my 1992 S10 Blazer 4x4 last week and the brake pedal went to the floor. Then the anti-lock brake and parking brake dash lights came on and stayed on. I changed the brake master cylinder and bled the brakes and now it stops better than ever. I have only pulled the battery cables to try to get the dash lights to clear, but they are still on. Any info to clear the dash lights would be appreciated.

 

There is a switch/sensor on the combination valve that controls that light I believe. I had that happen once, rear wheel cylinder popped. After I repaired everything the light went out. Maybe try disconnecting it the switch wire?

 

If/when there is a hydraulic failure in one of the brake circuits, (front or rear brakes) the centering valve shuts off the failed circuit and turns the dash light on. After the repair is complete, and the system is properly bled, the valve is centered and the light will shut off. Either the centering valve is stuck, or there's a leak in one of the circuits that has not been repaired. When you bled the brakes, did you bleed all 4 wheels? If not, which wheels did you bleed?

 

I bled all 4 wheels, right rear first. Then left rear, front right and front left. I did this sequence twice after changing the master cylinder to make sure all the air was bled out.

 

Which circuit had low flow while bleeding?

 

It looked like all 4 wheels had good fluid push when bleeding them. That's why I figured the antilock system needed to be reset or maybe cleared with a scan tool?

 

Follow the brake lines, they will go into the centering valve, usually near the master. There will be a connector with one wire. Un plug it and see if the dash light goes out.