TM 10-3930-659-20 10-8. SERVICE BRAKE RESIDUAL PRESSURE TEST (Con’t). CAUTION Brake pedal must be released when reading on pressure gage reaches 30 psi (207 kPa).  Damage to brake valve may occur if brake pedal Is not released. 11. Press and hold right brake pedal (1) until reading on pressure gage (8) reaches 30 psi (207 kPa).  Release brake pedal and note amount of time required for pressure to drop from 30 psi (207 kPa) to 5 psi (34 kPa).  If pressure drops to 5 psi (34 kPa) within 10 seconds, residual pressure is within specification.  If amount of time required for pressure to drop is more than 10 seconds, replace brake valve (see paragraph 10-9). 12. Repeat steps 1 and 2. 13. Remove pressure gage (8) and hose (7) from adapter (14). 14. Remove hose (5) and preformed packing (10) from tee (11).  Discard preformed packing. TA706944 10-23