Just a quick question to all those that have had experience with the Bosch ABS system, since it could save me some time and $$$; when I turn the key to the on position, I hear the relay one of the relays click about 3 times and the ABS light flashes in unison as well, then the light goes out; it will stay out until I begin to drive, and then it will stay on; I am familiar with the fact that the system is supposed perform a self-test at about 4 miles per hour, which unfortunately, the system is not doing now; before I pick up one of the Kent-Moore J35890 ABS testers on line, which I can get pretty cheap, are there any other easy checks to perform? I have the FSM, however it doesn't say you can do much other than check the "BRAKE" and "GAUGE" fuses, and make sure all the wheel speed sensors are seated properly; any suggestions to those who have gone through some testing? I'm guessing it's probably not the relays, since I can hear one clicking; hopefully it's just one of the wheel sensors, but will need the tool so I don't just start replacing unnecessary parts; actually, now that I'm mentioning it, does anyone have the AC Delco parts #'s for both the pump motor and solenoid relays that sit on top of the modulator valve? If they are fairly cheap, I may start with those 2, since even though I can hear one of them clicking, not sure if the other is working as well.......


Regards, Chris

 

There is no connection between the ECM and ABS so there are no codes from the ECM.
The Kent-Moore box will check the chassis side of the ABS. That is the wheel sensors.
Unfortunately it does not check the control box nor pump. Our only recourse is to R&R the brake control module.
I'd start with the wheel sensors. Check each sensor/wiring visually and clean the tips with compressed air.

Fleabay has ABS modules from 90 bucks and up.
Remans are a lot more...

 

Forgot to ask. How are the brakes?
Does the ABS function when hard braking on wet surfaces?

 

http://www.corvettefever.com/howto/19239/

My issue was the relay that this article points to as the most common problem. I removed the relay and jumpered 30 to 87, I think (double check me on this by reading the schematic on the relay). I then tested the system and it worked perfectly. The relay is OOP and difficult to get, I used a boneyard part I picked up on EBay.

 

Jr. Thanks; I'm hoping it's just one of the wheel sensors..........

Jr. I tried it on a sandy surface, and the brakes do lock up, so no, the ABS system is not functioning as it should........

Dino: Thanks for the article; I remember seeing that article way back when; never thought I would ever need it again; I will try those checks and report back on my findings.........