Took truck into the shop for the abs light and brake light coming on and saying service brake system. They determined that the ABS Modulator Valve needs replaced and quoted me $640 plus an additional $150 to flash the ebcm and ecm once done. I found the modulator valve on rockauto for $134, and would like to just replace myself. I generaly do all my wrenching on my vehicles but I am unsure on replacing the modulator as I have heard that to bleed the brakes after replacing the modulator you have to use a tech 2 to be able to acuate the valves in the modulator while bleeding. Has anyone heard of this? Or had to replace the modulator?