Cutlass L4-138 2.3L VIN A FI HP (1990)
Dash Board / Instrument Panel: All Technical Service Bulletins
Interior - Rattle/Buzz From I/P During Braking
NUMBER:
92-T-38
CORP.REF.NO: 135001R
DATE:
February 1992
SECTION:
5
SUBJECT:
RATTLE/BUZZ FROM INSTRUMENT PANEL DURING BRAKE APPLY/RELEASE
- INSTALL NEW VACUUM CHECK VALVE
MODELS/YEARS:
1990-91 SILHOUETTE AND 1988-92 CUTLASS SUPREME
This bulletin cancels and replaces Dealer Technical Bulletin 91-T-59 which should be discarded.
CONDITION:
Some 1990-91 Silhouettes may exhibit a rattle or buzz type noise which seems to come from the instrument panel area in front of the driver. In addition,
some 1988-91 Cutlass Supreme with J65 brakes and all 1992 Cutlass Supremes may exhibit a noise which seems to come from the instrument panel area
in front of the driver.
CAUSE:
A vibration in the vacuum check valve on the power brake booster.
CORRECTION:
To eliminate this noise, a revised vacuum check valve has been released. This new check valve is on all Silhouettes built after vehicle number
MT305086.
For Silhouettes built prior to this breakpoint, and for 1988-92 Cutlass Supremes, install a new vacuum check valve and rubber grommet kit, P/N
18018978, which is currently available from GMSPO.
