Master Cylinder: Removal
CAUTION:
Stored vacuum in vacuum booster must be pumped down (removed) before removing master cylinder from vacuum booster. This is necessary to prevent vacuum booster from sucking in contamination as master cylinder is removed. This can be done simply by pumping brake pedal, with vehicle's engine not running, until a firm feeling brake pedal is achieved.
- With engine not running, pump brake pedal until a firm pedal is achieved (4-5 strokes). Remove primary and secondary brake tubes from master cylinder outlet ports. See Fig 1
. Install plugs in master cylinder outlet ports.CAUTION: Before removing master cylinder from vacuum booster, master cylinder and vacuum booster must be thoroughly cleaned. This must be done to prevent dirt from falling into vacuum booster.
- Clean area where master cylinder attaches to vacuum booster. Use only a solvent such as Mopar Brake Parts Cleaner or an equivalent. Remove 2 nuts mounting master cylinder to vacuum booster. See Fig 2
. Slide master cylinder straight out of vacuum booster.CAUTION: The master cylinder is used to create seal for holding vacuum in vacuum booster. The vacuum seal on master cylinder MUST be replaced whenever master cylinder is removed from vacuum booster.
- Remove vacuum seal from mounting flange of master cylinder. DO NOT pry seal off master cylinder by inserting a sharp tool between seal and master cylinder casting.