ABS Brakes

My anti lock light comes on after the 'self test' at 4 mph. Can you pull an error code from the ABS system?

[Ken]

If the dashboard warning lightcomes on and stays on while the vehicle is in motion, the ABS is in need of attention.

Preliminary checks you can do before taking the vehicle in for service include:

• Check that the control module connection is secure.
• Follow the wiring harness to each wheel and check all connections.
• Check the brake fuse.
• Check the gauge fuse.

Other than that, I can't find a method for pulling codes from the ABS; you'll have to take it to a qualified mechanic.

Good luck.

I haven't seen one of these tester for sale but I'm sure a GM Service Shop should have em but as to them knowing how to use them is another story.

[Ken]

Unless one is proficient with braking systems, it's best left to the professionals when it comes to anti-lock braking and today's cars.

_ken

[CyberFire 12]

Shortly after I got my car, the Service ABS light came on. Two separate mechanics diagnosed a bad controller. (I had a NAPA rebuilt one installed for half the cost of a new GM one!)


Anyway, It really affected my braking big time to the point the car would not respond at all to the pedal!! The symptoms included constant noise (self-test?) and a rock hard pedal. Sometimes the problem would last several minutes and sometimes would abate quickly. I even removed the fuse because of the pedal problems.

Anyway, I agree you should have it looked at by a qualified mechanic soon. FWIW I'm a fan of ABS. Despite what some posters here have written, the safety and control afforded by the system are well worth the cost of repairs.

Good luck.

[Ken]

Originally posted by CyberFire 12
... the safety and control afforded by the system are well worth the cost of repairs.

Amen brother!

_ken

[Hib Halverson]

Originally posted by Vrotate
My anti lock light comes on after the 'self test' at 4 mph. Can you pull an error code from the ABS system?

Unfortunately, with 86-89s, you can't. The ABS in those MYs has no on-board diagnostics so a special tool, an "ABS Tester", is required. Worse yet, in many cases, repairs suggested by the service manual on the basis of ABS Tester data require another device, the Pinout box to acomplish the repairs.

It wasn't until 1990 when GM gave Corvette ABS self-diagnostics. At that point, the DIY's life became easier.

I'd suggest finding a service facility that has both those tools.