What do you mean by "dash lites up". If it is the Brake Light Failure indicator, I would suspect the Line Pressure Sensor has tripped because you have low pressure somewhere. If all your Lights tend to get Brighter I would suspect that you have a Bad or NO Ground on the Brake Light circuit.
If you suspect a ground problem, use a Digital Volt Meter (DVM) to measure the voltage drop between your various grounds and the negative battery connection. You'll want to do this with the circuits loaded in various ways (lights on, brake depressed, etc.). In all cases you should very small voltage readings (< 0.05 volts or so). If you see higher readings you've found a bad ground. You'll probably need to extend your meter leads some way. I have about a 10' piece of wire with allegator clips on it that I use. I've also used jumper cables or an extension cord.
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