Guys, my ABS acting really weird after my rotor and SS lines upgrade brake pads and brake fluid are fine, along with a changed of right side wheel hub(because I ran the car to sidewalk once and messed up), and wheel hub it was from my mechanic so i dont' know if it is new or used. the ABS will goes off sometime when I didn't even step on the brake, and after a while the ABS light comes on, or the speedometer shows unmatching numbers to my actual speed, for example if I am going around 40mph, the number drops to 20 sth and jump up to 60 sth it gose up and down for few second before ABS light comes on.

This problem is really bothering me, I hope someone can help me here.

 

Sounds like the wheel speed sensor on the hub that was replaced was either damaged or not reconnected good.

 

Hmmmm, do you have a picture where is the speed sensor locate on the hub? this is may be where the problem comes from.

 

Its the only part on the backside of the hub with a wire attached to it.

 

Any other thing will makes the problem?

 

The back side of the hub should have a serated area where the ABS sensor reads the serations or notches as speed or difference of one wheel to another as wheel slip, or loss of traction. A wheel sensor not set to spec or the hub area damaged could cause your problem.

 

just finished another upgrade to my brakes, from oem slotted and rotor, ss lines to stop st40 front and st22 rear kit, haven't test drive it too tired from working on it day and night, lol. will do it tomorrow, see if the ABS is still acting weird or not.