K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Vacuum Brake Booster: Testing and Inspection
Bendix Brake Boosters
Accumulator Leak-Down, System Does Not Hold Charge
1.
Contamination in steering hydro-boost system.
2.
Internal leakage in accumulator system.
Grabby Brakes or Booster Chatters/Pedal Vibrates
1.
Faulty spool action caused by contamination in system.
2.
Power steering pump belts slip.
3.
Low fluid level in power steering pump.
4.
Faulty spool operation caused by contamination in system.
Slow Brake Pedal Return
1.
Excessive seal friction in booster.
2.
Faulty spool action.
3.
Restriction in return line from booster to pump reservoir.
4.
Damaged input rod end.
