NHTSA ID Number: 10179885
Manufacturer Communication Number: CONMET FLAT ROTO
TSB/Document Date: 2020-09-16
Summary
ConMet Work Instructions for Inspection of ConMet Disc Brake Rotor to Hub Fastener. Please see the attached instructions on inspecting the ConMet disc brake rotor to hub fastener. Rotor mounting studs installed on steer and drive hubs on vehicles with flat rotors may fracture due to hydrogen embrittlement.
Consolidated Metco Inc
5701 SE Columbia Way
Vancouver, WA 98661
(800) 425‐4827
WWW.CONMET.COM
ConMet Flat Rotor Stud Inventory Inspection Work Procedure
TOOLS REQUIRED:
Torque wrench or standard wrench – capable of 40 ft-lb
15/16” thin walled socket
Flat-head screwdriver
PROCEDURE – STEER HUB:
Note: A thin-wall socket must be used to clear the ABS ring on steer hubs.
1. Support the hub in a way that allows up to 40 ft-lb of torque to be applied to the rotor mounting nuts.
Potential methods include setting in an upside down drum or wheel or other fixture or held by a second person.
2. Torque all ten (10) rotor attachment nuts in the tightening direction to 40 ft-lb (or practical equivalent). If the
nut turns, continue to tighten the nut to verify that the stud is being pulled out of the hub. This is a reject
condition. Note: due to the length of the stud shank and friction between the stud shank and the hub it may
not be easy to remove the stud by hand even after the stud rotates freely.
3. Mark rejected hubs as “RS NG” and reserve for ConMet. Replace with a new hub assembly.
4. Mark certified hubs with a “RS OK” on the top of the flat pads on the rotor.
5. If the inspected hub was removed from an axle, replace the seal before reassembling on to the axle.
PROCEDURE – DRIVE HUB:
1. Support the hub in a way that allows up to 40 ft-lb of torque to be applied to the rotor mounting nuts.
Potential methods include setting in an upside down drum or wheel or other fixture or held by a second person.
2. Remove the ABS retaining ring by gently prying it out of the groove with the flat head screwdriver.
Consolidated Metco Inc
5701 SE Columbia Way
Vancouver, WA 98661
(800) 425‐4827
WWW.CONMET.COM
3. Remove the ABS ring from the rotor.
4. Torque all ten (10) rotor attachment nuts in the tightening direction to 40 ft-lb (or practical equivalent). If the
nut turns, continue to tighten the nut to verify that the stud is being pulled out of the hub. This is a reject
condition. Note: due to the length of the stud shank and friction between the stud shank and the hub it may
not be easy to remove the stud by hand even after the stud rotates freely.
5. Mark rejected hubs as “RS NG” and reserve for ConMet. Replace with a new hub assembly.
6. Mark certified hubs with a “RS OK”.
Consolidated Metco Inc
5701 SE Columbia Way
Vancouver, WA 98661
(800) 425‐4827
WWW.CONMET.COM
7. If no failed studs are found, reinstall the ABS ring. Make sure the ABS ring retaining tabs are between the
bosses on the rotor.
8. Install the snap ring into the groove in the rotor. Start with one end and work around the rotor ensuring the
ring is fully engaged into each tab.
9. If the inspected hub was removed from an axle, replace the seal before reassembling on to the axle.
APPENDIX:
Below images are prevoius examples of certified inspected hub marking.
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- Low-moisture formula provides excellent vapor lock...
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- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
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- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: CONMET FLAT ROTO
Replacement Service Bulletin Number:
MFR Communication Date: 2020-09-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
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