I have a similar problem. I just bought a 1999 Silverado LS 1500 5.3L. The Brake and ABS lite stay on all the time. Checked the fuses, and they were good. Took it to the local Chevy dealer, and asked the Service writer ( a firend of mine) what he thought it was. He replied the ABS pump was shot. I dont have a running pump sound at all.
If I can replace the pump for $100.00 with a rebuilt unit I would love to know where to get it.
Thanks,
Ed Crabb
Molalla Oregon
[email protected]