Looking for some advice on this as it has hit the point now where the dash boards an xmas tree. About 2 years ago, started to notice when the jeep was cold (and when the weather was cold) i could push the brake pedal down to a point and get a very loud whistle noise from the master cylinder brake booster area. Nothing to do with the physical brakes themselves as this would be at a stand still. Thought nothing really of it as my brakes were working just fine. Pedal would eventually get squishy, bleed the brakes and I'd always have a fair amount of air in the lines. No leaks though and the master was never low. Now 3 weeks ago, brake light comes on the dash, brake performance hasnt changed and I haven't had the whistle because it's not cold out. I'm thinking it has to be related to that whistle though... vacuum line or the booster is shot?? Stuck on this one as I haven't had a chance to scan it.
On top of this, abs and traction control lights have been on (got tired of it going on and off so just pulled that fuse over a year ago), but when the brake light came on I put the fuse back in and the lights stayed on. Abs doesnt work, cruise control doesnt work so Im thinking this is a wheel speed sensor issue and not the abs module. Will be swapping out the front hubs anyways as they are due, and the rear sensors I replaced last year.
Is the brake light being on tied to my abs system not functioning due to speed sensors not working or is this an issue with air trapped in the abs manifold or the abs module being toast, mc/booster gone bad, or something else all together?
Any help would be great.