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 ALL  ú ú 01 Page 403 ú Dec 20/90
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757 MAINTENANCE MANUAL
 D. Install the Secondary Brake (Fig. 401)
 S 204-038
 (1)  
Inspect the o-ring on the brake differential shaft and replace the 0-ring if it necessary.

 S 624-013

 (2)  
Clean and apply a large quantity of grease to the part of the brake differential shaft that you can see.

 S 164-014

 (3)  
Make sure the mating surfaces of the brake mounting flange and the stabilizer ballscrew actuator are clean.

 S 424-015

 (4)  
Do the steps that follow to put the secondary brake in its correct position:

 (a)  
Engage the splines on the internal brake shaft with the splines on the brake differential shaft.

 (b)  
Align the brake mounting flange with the studs until the hydraulic ports are in the correct positions.

 (c)  
Lower the secondary brake to the correct position.

 S 434-016
 (5)  Install the bolts to attach the secondary brake to the stabilizer ballscrew actuator.
 NOTE: Tighten the bolts equally.
____
 S 434-017
 (6)  
Remove the plugs from the hydraulic lines and the caps from the ports.

 (7)  
Connect the hydraulic lines to the secondary brake.

 S 624-020

 (8)  
Apply primer to the metal surfaces around the brake mounting flange that you can see.

 S 434-019
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757 MAINTENANCE MANUAL
 S 714-021
 (9)  
Do the Test for the Secondary Brake.

 E.
Secondary Brake Test

 S 494-022
 (1)  
Make sure the person in the control cabin can speak to the person in the forward stabilizer compartment.

 S 864-023

 (2)  
Supply electrical power (Ref 24-22-00).

 S 864-024

 (3)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead panel, P11:

 (a)  
11B19, STAB TRIM ALT (IF INSTALLED)

 (b)  
11C12, STAB TRIM SHUTOFF LEFT

 (c)  
11C13, STAB TRIM SHUTOFF RIGHT

 (d)  
11H11 or 11C05, STAB TRIM CONT L

 (e)  
11H20, STAB TRIM CONT R

 S 864-025
 (4)  Put the RIGHT and CENTER STAB TRIM SHUTOFF valve switches on the control stand panel, P10, to the NORM position.
 S 864-026
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (5)  Supply power to the applicable hydraulic system that follows (Ref 29-11-00):
 NOTE:____Operate only one secondary brake at a time. You cannot find
 failures if you pressurize the left and right secondary brakes at the same time.
 (a) The right hydraulic system for the right secondary brake
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757
MAINTENANCE MANUAL

 (b)  The center hydraulic system for the left secondary brake.
 S 864-027
 (6)  
Move the stabilizer to 8 units of trim as shown on the stabilizer position indicators.

 S 864-028

 (7)  
Push and hold the BRAKE BYPASS valve button on the applicable stabilizer trim control module.

 NOTE: The button is on the bottom of the unit.
____
 The force necessary to push the button should be less than 25 pounds (111 newtons). You should push the button smoothly. If the force necessary to push the button is more than 25 pounds (111 newtons), remove the hydraulic power, push the button more than once, then supply the hydraulic power.
　
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