(1) Tighten the brake mounting bolts in the two steps that follow:
CAUTION: IF YOU INSTALL THE SAME LOCKNUTS THAT YOU REMOVED, YOU MUST DO A CHECK TO MAKE SURE THAT THE LOCKNUTS MEET THE MINIMUM BREAKAWAY TORQUE VALUES AS GIVEN IN AMM 20-50-11.
(a)
Tighten the bolts to 60-70 pound-feet in a crisscross pattern.
NOTE: Tighten the bolts, not the nuts.
(b)
Tighten the bolts to a last torque of 125-135 pound-feet in a circular pattern.
C. Lubricate new preformed seal and two backing rings with clean hydraulic fluid and install seal and backup rings in groove of outer body of brake disconnect valve.
D. Engage outer body of brake disconnect valve with inner portion installed in brake carrier pressure port.
E. Position outer body of disconnect valve with three holes aligned and connecting hydraulic hose pointing forward. Install three sets of bolts and washers, tighten 130 to 150 pound-inches, and secure with lockwire.
NOTE: Only three of the four tapped holes in the brake carrier pressure port boss are used for disconnect valve attachment.
F. Install wheel and tire assembly (Ref 32-45-11 R/I)
G. Lower and remove axle jack (Ref Chapter 7, Jacking Airplane).
H. Pressurize hydraulic system B (Ref 29-11-0 and 29-12-0).
NOTE: System A for inboard brake; system B for outboard brake.
I. Bleed brake system by depressing captain's or first officer's brake pedals fully and slowly for six times.
WARNING: MAIN GEAR BRAKES MUST BE BLED AFTER INSTALLATION OR
INOPERABLE BRAKES MAY OCCUR.
NOTE: Check brake pressure plate for tendency to hang or stick during brake application.
J. Service hydraulic reservoir (Ref Chapter 12, Hydraulic Servicing).
K. Set parking brakes.
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32-41-41 Page 406 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Apr 01/97
MAIN GEAR BRAKE - INSPECTION/CHECK
1. Main Gear Brake Check
A. General
(1) The main gear brake unit can be checked with wheel in place. Further checks are made of brake unit when the wheel is off.
B. Equipment and Materials
(1) Gear Ground Lock Assembly - F72735 (AMM 32-00-01)
C. Prepare for Check
(1)
Check that landing gear is down and locked and ground lock assemblies are installed (AMM 32-00-01).
(2)
Chock wheels and release parking brake.
(3)
Provide electrical power to airplane.
D. Check Main Gear Brake with Wheel in Place
(1)
Pressurize hydraulic systems A and B (AMM 29-11-0, Maintenance Practices and AMM 29-12-0, Maintenance Practices).
(2)
Fully apply and release the left and right captain's or first officer's brake pedals five times.
(3)
With the brakes not applied, do a check of the brakes for fluid leaks at these locations: Brake pistons, brake housing ports, inlet and drain ports, bleed ports and all hydraulic line connections, flexible hoses, brake carrier drilled passage plugs, connections between brake unit and brake metering valve.
(4)
If the total leakage per brake at the above locations is greater than 1 drop per minute with the brake pedals not applied, repair the leak(s) or replace (or deactivate if applicable) the brake prior to dispatch.
(5)
Set parking brake.
(6)
Slowly apply the brake pedals to the stops.
(7)
While the brake pedals are applied, do a check of the brakes for fluid leaks at the same locations as in step (3).
(8)
If the total leakage per brake at the above locations is greater than 5 drops per minute, while the brakes are being applied, repair the leak(s) or replace (or deactivate if applicable) the brake prior to dispatch.
(9)
Brakes with leaks below these limits must be rechecked prior to each flight, and should be repaired or replaced at the next opportunity that manpower and material allow.
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