ABS always engages when stopping
Thread Starter
Racer
Joined: Aug 2001
Posts: 416
Likes: 0
From: Astoria OR
ABS always engages when stopping
Hey everyone, Each time I stop since yesterday my ABS comes on. It pulses and the light comes on. It does the testing each time I start going like normal but after that even in traffic when I slow to almost a stop it pulses again. Any thoughts?
Pro
Joined: Nov 1999
Posts: 623
Likes: 0
From: Toronto, ON, Canada
Re: ABS always engages when stopping (Tim89)
Did you change your rims / wheel size? I've read that a 5-8% size deviance from front to back can cause ABS to trigger.
Beyond that I'm surprised you haven't triggered an ABS error, maybe try pulling codes.
Beyond that I'm surprised you haven't triggered an ABS error, maybe try pulling codes.
Thread Starter
Racer
Joined: Aug 2001
Posts: 416
Likes: 0
From: Astoria OR
Re: ABS always engages when stopping (96LT1)
I havn't changed anything but I did a search and read that I should top off my brake fluid. I did that and it helped but I still got the light and pulsing once after. Maybe I need still more fluid? Air in the lines? If anyone knows, I'd love to find out. If the fluid fixes it I'll let you guys know.
Melting Slicks
Joined: May 2001
Posts: 3,270
Likes: 26
From: Winchester VA
Cruise-In V Veteran
Re: ABS always engages when stopping (Tim89)
I have seen this many times on other vehicles, caused by a problem with the reluctor ring. Usually cracked, and the wheel speed signal is lost just long enough that the control module thinks one wheel has locked up and ABS goes active. The crack is small, which is why it is only detected at slow speeds. It is doing what it thinks it's supposed to do so, no trouble codes.
The systems are usually pretty good at picking up a sensor error, but this condition does not present itself to the controller as system fault.
No way to narrow it down w/out a scan tool that can record and plot the sensors info for a given time period. SOOO, Grab a few wrenches, a flashlight and look the reluctor rings over real close.
The systems are usually pretty good at picking up a sensor error, but this condition does not present itself to the controller as system fault.
No way to narrow it down w/out a scan tool that can record and plot the sensors info for a given time period. SOOO, Grab a few wrenches, a flashlight and look the reluctor rings over real close.
