Ok, I have read the threads about people's abs acting up. Each of them though throw Slip, VDC and ABS lights.. Mine does not.

When coming to a stop the abs will pulsate when it clearly shouldn't Nothing illuminates on the dash.. I tested the lights prior to start up and they are all functional.

I then tried an Abrupt stop from 60mph Abs did engage and worked under hard braking.

I don't know what this requires.. My rotors and Pads are in great shape and less than a year old and plenty of meat on pads..

How do I diagnose without throwing lights? Does anyone know what this is?

 

possibly loosened ABS line?

 

How do I check? Where is it located?

 

Do you have wheels and tires different from the original OEM specs?


What tread depth do you have on all your tires?

 

I had similar issues; mine was caused by my ABS sensor by the rear diff being misaligned with the axle flange after a pumpkin swap...

 

Yup, Id say its either a tire size issue and or a abs sensor out of place.

Does it act up when VDC is off?

IF IT DOESNT, then its mis sized tire/wheel setup.
if it does check the sensors. They are at each corner held on by a 12mm bolt. just look for a wire/plug. its the ONLY electronic thing in the front wheel wells and on the rear they are ousted to the diff housing facing the "gear" looking axle part.

 

This could be it, since my rear Diff mount is torn recently...

I jacked the car up last week and the sensor wires appeared to be intact.

 

Not just the wires...the abs sensors needs to be aligned with the little spokes on the axle flange...