ABS - Activation On Rough Roads

91caddy02
Bulletin No. T-91-51
File in Group 5E
Number 3
Corp. Ref. No. 115004
Date Feb. 1991




SUBJECT: ABS ACTIVATION DURING BRAKING ON ROUGH ROADS


MODELS AFFECTED: 1990-1991 BROUGHAMS 1991 ELDORADOS AND SEVILLES


On 1990-1991 Broughams and 1991 Eldorados and Sevilles the ABS may activate during brake application while driving on rough or washboard-type surfaced roads. This is a normal condition.


During braking on a rough road it is possible for one or more wheels to leave the road surface. When this occurs, the ABS Electronic Brake Control Module (EBCM) interprets the airborne wheel as locking up. The EBCM will subsequently initialize ABS and reduce brake line pressure to the wheels that are locking. This is a calculated response.