SOURCE: abs default light is on
You have replaced the Master Cylinder and ABS sensors, That only leaves the calipers and Vacuum line to the master Cylinder. When you replaced the sensors and Master Cylinder I assume you reset the ECM module. If you didn't try resetting the ECM by removing the Negative Terminal for 1 min then reconnect it and see if that ABS light comes back on. If it does then you need to check the Vacuum line on the Master Cylinder and make sure you have Good vacuum. If the Vacuum is good check your Brake Calipers to make sure they aren't malfunctioning.
SOURCE: abs light
This is a (4) four wheel sensor system and more than likely one of them has failed. This will cause ABS module to turn on warning lamp and make the brake pedal 'act up' under the right conditions.This 'acting up' is the ABS system getting a false signal that a wheel is not turning the same as the others when it actually is. Have it scanned for codes and a streaming data scan on a road test under the same conditions that you are experiencing the 'act up' to pinpoint the fault. Hope this helps! Please rate me.
SOURCE: how do you test abs wheel sensors on 2006
with a scanner driving. all should read the same., yes they are in the hub and need to be replaced as a whole. You could ohm them to see if one is bad but alot of times this is inconclusive. You will have better luck driving and monitoring the sensors.
SOURCE: how do i change out the knock sensor on a 2006 chevy colorado
You didn't list your engine size so please pick the applicable to your motor size:
Removal & Installation
2.8L & 2.9L Engines
To Remove:
Knock sensor (KS) (A), Engine harness (B), Knock sensor (KS) connector (C)
To Install:
SOURCE: who do i replace the rear ABS speed sensor on 2006
i belive theres two ,one on each wheel in the rear, you unplug connector, then remove the bolt holding sensor to backing plate and then remove, two wheel drive vans you need too replace the wheel bearing asm,heres two pictures too show you and then you see which type you have,one is the sensor the wire type the other is the bearing asm, hope this helps,
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