This stuff is my specialty, sounds like POSSIBLY your abs pump motor failing (the abs module mounts to the abs hydraulic pump where all the brake lines go into) i.e abs module=brain abs pump=muscle to put it simply. get the fault code(s), its going to be something like C0265 or C1214 basically "C" then 4 numbers. I can tell you EXACTLY what your problem is WITHOUT having to throw a bunch of money away by replacing unnecessary parts.
- BRAKES - SQUEAK NOISE ON BRAKE PEDAL APPLICATION
TECHNICAL SERVICE BULLETIN
Bulletin No.: 08-05-22-002C
Date: April 07, 2009
Squeak Noise On Brake Apply (Remove Brake Fluid
from Master Cylinder and Refill)
Some customers may comment on a squeak noise when the brake pedal is applied or when released. This noise is normally heard when the brake pedal is slowly applied with the engine on or off, but can occur when the brake pedal is released. The noise may be isolated to the master cylinder area.
To correct this concern, remove as much of the old brake fluid
from the master cylinder as possible and refill with a new DOT 3 brake fluid, P/N 88862806 (in Canada, use P/N 88862807). Start the vehicle and fully cycle the brake pedal until the noise diminishes to allow the new fluid to enter the system. hope this helps! -Tim