GM Service Manual Online
For 1990-2009 cars only

No Engine Braking; Manual First -- First Gear

Checks

Causes

Coast Clutch

No apply (Refer to No Engine Braking; All Manual Ranges )

Lo and Reverse Servo

No apply (Refer to No Reverse or Slips in Reverse )

Pressure Switch Assembly (13)

Leaking or inoperative

#1 Checkball

Missing