ABS light due to pressure modulator valve assembly failure on Buick LeSabre

Problem Description and Possible Solution
The anti-lock brake (ABS) pressure modulator valve assembly may fail internally causing the ABS light to illuminate.
Problem Data
RepairPal Verified
Average mileage: 138,641 (73,000–240,000)
9 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2002
40 people reported this problem
Viewing 1 - 14 of 14 comments
ABS started malfunctioning, pulsing as soon as I touch the pedal (under 5mph) and would even pulse without touching the break pedal. Then ABS light appeared, which was due to a faulty wheel hub. Replaced the hub and the ABS light turned off, but the pulsing problem still exists. Only an issue under 5mph, but it pulses every time. For example, rolling up on a stop sign, as soon as its nearly stopped it will start pulsing
I own a 1994 Buick LeSabre. I purchased the car brand new on 10/31/1994. It has always been maintained very well; however, my ABS - Anti Lock idiot light just came on.
ABS light comes on a shortly after driving. occasionally make the pumping noise when I apply or release the breaks.
Car swerves left when braking, especially at highway speed. Alignment done, tire rotation done, new calipers and hoses, brakes are good. Diagnoses was ABS. Light is not on however.
Can this be done outside dealership. Got estimate of $1100.
brake pressure modulator valve