NHTSA ID Number: 10078707
Manufacturer Communication Number: SC0398
TSB/Document Date: 2016-08-15
Summary
BRAKE CHAMBER REPLACEMENT RECALL.
1M2AX34C8EM010020
1M2AX34C8EM010082
1M2AX34C9EM010074
1M2AX34C9GM010224
1M2AX34CXEM010021
1M2AX34CXEM010083
1M2AX34CXFM010117
1M2AX34CXFM010120
1M2AX35C0FM010058
1M2AX35C0FM010061
1M2AX35C0FM010075
1M2AX35C1FM010053
1M2AX35C1FM010067
1M2AX35C2FM010059
Part Number
5396-SC30LCW
85143550
5396-SC30LCW
85143550
5396-SC30LCW
85143550
5396-SC30LCW
5554-3431951
5554-3431951
85143550
5554-3431951
85143550
85143550
5396-GC3030CW
5396-SC30LCW
85143550
5396-SC30LCW
5396-GC3030CW
85143550
85143550
5396-SC30LCW
5396-GC3030CW
85143550
5396-SC30LCW
85143550
5396-GC3030CW
85143550
5396-SC30LCW
5396-SC30LCW
85143550
5396-GC3030CW
5396-GC3030CW
5554-3431951
85143550
85143550
5396-GC3030CW
5396-GC3030CW
85143550
85143550
85143550
85143550
85143550
85143550
Quantity
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Brake Chamber Location
Front T30
Front T30
Front T30
Front T30
Front T30
Front T30
Front T30
Rear T3030 Basic
Rear T3030 Basic
Front T30
Rear T3030 Basic
Front T30
Front T30
Rear T3030 Basic
Front T30
Front T30
Front T30
Rear T3030 Basic
Front T30
Front T30
Front T30
Rear T3030 Basic
Front T30
Front T30
Front T30
Rear T3030 Basic
Front T30
Front T30
Front T30
Front T30
Rear T3030 Basic
Rear T3030 Basic
Rear T3030 Basic
Front T30
Front T30
Rear T3030 Basic
Rear T3030 Basic
Front T30
Front T30
Front T30
Front T30
Front T30
Front T30
MACK Trucks Inc.
Safety Recall
VIN Number
1M2AX35C2FM010062
1M2AX35C4FM010063
1M2AX35C6FM010064
1M2AX35C8EM010016
1M2AX35C9FM010057
1M2AX35C9FM010060
1M2AX35C9GM010111
Date
05.2106
Part Number
85143550
85143550
85143550
85145824
85143550
85143550
85143550
Quantity
2
2
2
2
2
2
2
Number
Page
SC0398
19 (35)
Brake Chamber Location
Front T30
Front T30
Front T30
Rear T3030 Long
Front T30
Front T30
Front T30
NOTE
The Illustrations shown in this document are used for reference only
and may differ slightly from the actual vehicle being serviced. However,
the replacement procedure represented as accurately as possible.
Park brake chambers are under extreme pressure and safe work
practices should be observed. If instructions are not followed correctly,
personal injury or death will occur.
Decommissioning the Truck for Inspection or Repair:
1. Secure the vehicle for service by parking on a flat and level surface, placing the
transmission in neutral, applying the parking brake, turning the ignition key to the
OFF position, and chocking the front wheels.
Page 20 (35)
2. Disconnect the cable from the battery’s negative (ground) terminal.
Brake Chamber, Replacement (Front Axle):
NOTE
This procedure covers the left and right front axle brake chambers.
1. Unlatch and open the hood.
2. Drain the complete air system of all pressure.
3. Remove the supply air line from the brake chamber.
MACK Trucks Inc.
Safety Recall
Date
05.2106
4. Remove fitting from the brake chamber.
NOTE
Record the position and orientation of the fitting for installation
purposes.
NOTE
Clean the fitting of any debris and store it for reuse.
5. Remove nuts securing the brake chamber to the mounting bracket.
Number
Page
SC0398
21 (35)
Page 22 (35)
6. Remove the clevis pins from the brake chamber and slack adjuster.
7. Remove the brake chamber.
NOTE
Discard the existing brake chamber.
MACK Trucks Inc.
Safety Recall
Date
05.2106
8. Position the new brake chamber.
9. Install the clevis pins securing the brake chamber and slack adjuster.
Number
Page
SC0398
23 (35)
Page 24 (35)
10. Install the fasteners securing the brake chamber to the mounting bracket.
11. On the first pass, tighten the fasteners to 34 Nm (25 ft-lb).
12. On the second pass, tighten the fasteners to 180 - 210 Nm (133 – 154 ft-lb).
13. Using thread sealant, install the fitting into the brake chamber.
14. Tighten the fitting to 37 ± 3 Nm (27 ± 2 ft-lb).
MACK Trucks Inc.
Safety Recall
Date
05.2106
Number
Page
SC0398
25 (35)
15. Install the supply air line to the brake chamber and tighten according to the
torque specification below.
NOTE
Use the table below to determine the correct air line hose end torque
specification.
Hose End Type
NPTF
SAE 45 Degree
Flare
SAE 37 Degree
Flare
Globe Seal
Air Line, Hose End Torque Specification
Thread
Torque Specification
3/8 in
38 ± 1.9 Nm (28 ± 1.4 ft-lb)
1/2 in
68 ± 4 Nm (50 ± 3 ft-lb)
3/4 – 16 UNF
47.5 ± 2.0 Nm (35 ± 1.5 ft-lb)
7/8 – 14 UNF
76 ± 4 Nm (56 ± 3 ft-lb)
1-1/16 - 14 FEM
108 ± 6 Nm (80 ± 4 ft-lb)
3/4 - 16 UNF
51 ± 2 Nm (37.5 ± 1.5 ft-lb)
7/8 – 14 UNF
81 ± 4 Nm (60 ± 3 ft-lb)
1-1/16 - 12 FEM
113 ± 6 Nm (84 ± 4 ft-lb)
3/4 – 20 UNEF
47.5 ± 2.0 Nm (35 ± 1.5 ft-lb)
16. Adjust the brake.
17. Repeat steps 2 through 16 for the opposite side of the axle.
18. Close and latch the hood.
Page 26 (35)
Brake Chamber, Replacement (Rear Axle):
NOTE
This procedure covers the left and right rear axle brake chambers.
1. Drain the complete air system of all pressure.
2. Cage the brake chamber.
3. Disconnect the park brake and service supply air lines from the park brake
chamber.
MACK Trucks Inc.
Safety Recall
Date
05.2106
Number
Page
SC0398
27 (35)
4. If applicable, remove the cotter pin and clevis pin from the park brake chamber
rod.
NOTE
Do not discard the clevis pin. Clean and store for reuse.
5. Remove the two nuts and washers from the park brake studs.
Page 28 (35)
6. Remove the cotter pin and clevis pin from the slack adjuster.
NOTE
Do not discard the clevis pin. Clean and store for reuse.
7. Remove the existing park brake chamber.
MACK Trucks Inc.
Safety Recall
Date
05.2106
Number
Page
SC0398
29 (35)
8. Remove the fittings from the existing park brake chamber.
NOTE
Clean the fittings of any debris and store them for reuse.
9. Using thread sealant, install the fittings on the replacement park brake chamber.
10. Tighten the fittings to 37 ± 3 Nm (27 ± 2 ft-lb).
Page 30 (35)
11. Cage the replacement park brake chamber.
12. Position the replacement park brake chamber as shown in the figure below.
MACK Trucks Inc.
Safety Recall
Date
05.2106
Number
Page
SC0398
31 (35)
13. Install the clevis pin into the park brake chamber rod.
14. Secure the clevis pin with a new cotter pin.
15. Install the two nuts and washers on the parking brake chamber studs.
16. On the first pass, tighten the fasteners to 34 Nm (25 ft-lb).
17. On the second pass, tighten the fasteners to 180 - 210 Nm (133 – 154 ft-lb).
Page 32 (35)
18. If applicable, install the clevis pin and cotter pin into the slack adjuster.
19. Secure the clevis pin with a new cotter pin.
MACK Trucks Inc.
Safety Recall
Date
05.2106
Number
Page
SC0398
33 (35)
20. Connect the park brake and service supply air lines to the brake chamber and
tighten according to the torque specification.
NOTE
Use the table below to determine the correct air line hose end torque
specification.
Hose End Type
NPTF
SAE 45 Degree
Flare
SAE 37 Degree
Flare
Globe Seal
Air Line, Hose End Torque Specification
Thread
Torque Specification
3/8 in
38 ± 1.9 Nm (28 ± 1.4 ft-lb)
1/2 in
68 ± 4 Nm (50 ± 3 ft-lb)
3/4 – 16 UNF
47.5 ± 2.0 Nm (35 ± 1.5 ft-lb)
7/8 – 14 UNF
76 ± 4 Nm (56 ± 3 ft-lb)
1-1/16 - 14 FEM
108 ± 6 Nm (80 ± 4 ft-lb)
3/4 - 16 UNF
51 ± 2 Nm (37.5 ± 1.5 ft-lb)
7/8 – 14 UNF
81 ± 4 Nm (60 ± 3 ft-lb)
1-1/16 - 12 FEM
113 ± 6 Nm (84 ± 4 ft-lb)
3/4 – 20 UNEF
47.5 ± 2.0 Nm (35 ± 1.5 ft-lb)
Page 34 (35)
21. Un-cage the replacement park brake chamber.
NOTE
Ensure the brake chamber portal is covered with the supplied dust
cover after the park brake chamber is un-caged.
22. Repeat steps 1 – 21 for the opposite side of axle.
Commissioning the Truck for Operation:
1. Connect the battery cable to the negative (ground) terminal.
2. Start the engine, build the proper air system pressure, check for air leaks, and
proper service/park brake operation.
MACK Trucks Inc.
Safety Recall
Number
Page
SC0398
35 (35)
Date
05.2106
3. Remove the wheel chocks.
Reimbursement:
This repair is covered by an authorized Safety Recall campaign. Reimbursement is obtained through
the normal claim handling process.
UCHP Reimbursement
Claim Type (used only when uploading from the Dealer
Business System)
41
eWarranty Reimbursement
41
Recall Status
1-Modified per
instructions
Vehicle repaired per instructions
Labor Code
Primary Labor Code (Brake Chamber,
5126-03-09-08
5151A-01-95
Replacement, Front Axle) Per Axle
1.0 hrs
1.0 hrs
Labor Code (Brake Chamber, Replacement, Rear
5126-03-09-07
5171C-01-95
1.5 hrs
1.5 hrs
Time to take charge of vehicle and determine
campaign status
1700-16-01-01
0.3 hrs
17003-0-01
0.3 hrs
Causal Part
21370850
21370850
Authorization Number
C6570
SC0398
Take-charge time is not included in the labor code for this operation. Take charge may be eligible, but can
only be used once per vehicle repair visit. If the vehicle is having other warranty repairs performed, takecharge should be charged to the warranty repair, otherwise take-charge can be charged to this Safety
Recall campaign.
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: SC0398
Replacement Service Bulletin Number:
MFR Communication Date: 2016-05-06
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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