Basically this is how it works. That ball on the top (Accumulator) has a couple thousand psi of air in it, and it discharges when you push the brakes and recharges when the pump turns on. When the car is sitting overnight the accumulator leaks down, some worse than others, and then the next day the accumulator is empty so it cant assist the brakes so they go hard until the pump can repressurize the accumulator. There are 3 conditions in which the pump and warning lights work.
1. Accumulator drops in pressure a little bit, the pump turns on to recharge.
2. Accumulator drops in pressure more, which turns on the pump AND turns on the yellow ABS light.
3. Pressure drops a lot which turns the pump on, AND the yellow ABS light, AND the red brake warning light.
If your yellow and red lights are going on when you push the brakes it might be because the pressure is either lower than it should be, or it uses a lot more pressure than it should to activate the brakes.
This is one possible cause of your problem. It happened to my car when the pump died.
"-@--------@--" 1990 SSE " Black Ice " 220,000+ kms, GX3, sunroof
16" Streetwear Diablo wheels | Blazer Fog Lamps | Silverstar 9005 low beams | Mesh Grille | STB | '94 Top end | Delco Type 2 Ignition | Blue interior LEDs | LED 3rd brake light | Auto-dimming rear view mirror | Pioneer DEH-P7600MP | Rockford 5 1/4 Components and 6x9s
Daily driver : '95 Buick Regal Custom | Blue under dash LEDs | Infinity 5 1/4 components | 8 Inch sub under dash | 12 inch Bazooka sub in trunk | Rockford 4 ch amp | Trunk mounted EQ | Pulsing trunk LEDs