Bakes locking up and ABS light turns on

NATEKLEIN

MEMBER
2007 ISUZU TRUCK
2.9L
4 CYL
2WD
AUTOMATIC
114,000 MILES

Vehicle listed above is a i-290 model. Had a friend help me to change the brakes and rotors and forgot to take off the terminals off the battery before doing so. Took about 9 hours and was hard getting the ABS wheel speed sensor off the wheel hub and putting it back on. My friend did hit the wheel speed sensor against the wheel hub multiple times to put it back together. Rotors are new, I cannot recall if he bleed the brakes to be honest. I have no experience in that area and I am barely learning about cars. One more thing my brakes only lock up when I turn the car on and no more than 30 seconds it will last. Brakes work fine when need to brake and when driving. The ABS light on dashboard will be off when turning truck completely on and after driving it, the ABS light will appear on and that is when the brakes stop locking up. Would really appreciate any help or feedback as to why that happens or to change any specific parts?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,536 POSTS

This happens when the brake booster push rod is adjusted out too far which does not allow the brake master to return fully holding the brakes on . To confirm the issue loosen the brake master mounting bolts 3 turns to see if the car starts to roll again, if so remove the master and adjust the booster push rod inward. Also a brake flex hose can come apart internally causing a short of check valve in the system but this is usually isolated to one brake either front or rear. For the ABS light It sounds like you may have a wheel speed sensor that is out. These videos will help us find the problem:

https://youtu.be/rTtAnsOlZU4

and

https://youtu.be/Pb6nXV-iamI

and

https://youtu.be/ANWVTh2RQoQ

and

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

Please run down these guides and report back.