brake proportioning valve is reading a problem for the brakes you can bleed rear brakes they might have air in them chck you rear wheel cyl. or unplug the wire to the valve near the master cyl.
the abs plug in on the wheel came off or it is a higher possibility that the brake fluid is low and when it gets to the limit line the light comes on
are brake lights staying on or is brake in the dash on ?
It is located just above the brake pedal pad.
Low brake fluid possible
It is quite simple to change the brake light switch on your 1998 Chevy S 10 pickup truck. The brake light switch simply plugs in and out.
Check the fuse, check the bulbs, then check the brake light switch.
that light is the low coolant warning light
This light is trying to tell you that your brake fluid may be low. Check your brake fluid and fill if it needs it.
If the light is in the center of what looks to be a tire with tread then it is the low tire pressure warning light. If the light is in the center of a symbol that looks like this (o) then that is the brake light warning. It can mean your parking brake is on or there is a problem with the brake system. Check the level of the brake fluid in the master cylinder resivoir.
You can reset your Chevrolet 2500 pickup truck airbag warning light by removing the airbag warning light fuse. Keep the fuse out for 10 seconds and replace it to its original slot.
You may have a blown fuse or a defective brake light switch.
By repairing the problem. Low brake fluid, defective master cylinder, etc.