Sable V6-183 3.0L DOHC VIN S MFI (1997)
Vacuum Brake Booster: Adjustments
DESCRIPTION
The power brake booster (2005) has adjustable push rod (output rod) which is used to compensate for dimensional variations in assembled power
brake booster. The push rod length is adjusted after each power brake booster power unit has been assembled in production. A properly adjusted
push rod that remains within power brake booster after it was assembled in production should never require service adjustment.
SERVICE INDICATORS
A power brake booster suspected of having improper push rod length will indicate either of the following:
-
A push rod which is too long will prevent brake master cylinder piston from completely releasing hydraulic pressure and cause brakes to drag,
and result in pre-mature pad/shoe failure.
-
A push rod which is too short will increase brake pedal travel and cause a clunk or groaning noise from power brake booster.
REMOVAL
1. Apply service brake pedal several times to exhaust all vacuum in the system.
2. Disconnect brake fluid level warning switch connector if necessary.
3. Remove nut retaining cowl top inner panel tube to brake master cylinder.
4. Disconnect cowl top inner panel tube from cowl and remove.
5. Remove two nuts retaining brake master cylinder to power brake booster assembly.
6. Slide brake master cylinder forward and upward.
7. Brake master cylinder must be supported to prevent damaging brake tubes.
ADJUSTMENT PROCEDURE
CAUTION: Do not adjust push rod length too long or brake drag could result.
