1996 LT4 car. I've seen several posts about the brake pressure warning light. My car seems to fit the profile of; "I just bled the brakes and shortly thereafter the brake pressure light came on." I replaced the rear rotors and pads, the left rear caliper and both rear brake line hoses. I bled all 4 brakes to flush out old fluid. I have a solid/firm brake pedal and the car stops straight with no pedal fade. In one of the posts I read here someone suggested taking the car out and getting the ABS system to engage in case any air got into the ABS module. So I did that yesterday. Frankly, the car just stops, and stops quickly! LOL! It was all I could do to get the ABS to engage but eventually I went fast enough and stood on the brakes hard enough and got the ABS system to engage twice. The light remained on. BTW, did you know that according to posts Ive read here, the '96 only takes about 15' +/- longer to stop from 60 mph than the C8 base car? Impressive for sure...

I am going to bleed the brakes again as I've seen that as a possible remedy. Does the fact that the car does not pull to either side when stopping indicate that there is most likely no air in the front lines?

My service manual just says to fix whatever is causing the issue then apply firm pressure to the brakes to reset the light so I will try that after bleeding the brakes. I will also check all the brake lines I touched while replacing the rear parts for leaking.

If all that fails I am going to look at the switch in the MC that controls the light. Will there be fluid loss when changing out that switch? When removing and/or changing the switch should I be able to access the piston that slides to engage the switch and move it back to a center position? There is no fluid leakage around that switch.

Anything else I should try?

TIA for any and all suggestions!!

 

If all that fails I am going to look at the switch in the MC that controls the light. Will there be fluid loss when changing out that switch? When removing and/or changing the switch should I be able to access the piston that slides to engage the switch and move it back to a center position? There is no fluid leakage around that switch.

That switch is a toggle switch that is moved by a shaft when the master cylinder pressure is not equal. No fluid should come out if you remove the switch. Unplug the wire at the master cylinder and see if the brake light goes out. If yes that is your problem. If no the parking brake is the problem.

 

Thanks. I did remove the switch and cleaned the spring and plunger and put the switch back in and now the light is out. At least for now!!! ;-)