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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 4T80-E - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Engine Braking in D1

No Engine Braking in D1

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No Engine Braking in D1

Checks Causes
Checkball No. 6 Missing
Coast Clutch Plates Burned, damaged
Coast Clutch Seal/Checkball Cut, worn or nicked
Lo/Reverse Band Slipping, burned, damaged
Lo/Reverse Servo Piston Damaged, seized
Lo/Reverse Servo Seals Leaking, rolled