Brand
Caliper Application – Vanhool Front and Tag
Rotor Diameter – 434.34 mm
Rotor Thickness – 45.0 mm
Rotor Height – 130.05 mm
Pilot Diameter – 130.81 mm
Bolt Circle – 167.89 mm
Rotor Type – H
Cross Reference – Meritor:M44D76621, OEM: N508030038 N508030040
Rotors subjected to extremely high heat followed by rapid cooling can exhibit a Martensite Spotted condition. This condition appears as black spots on the rotor that are slightly raised and are hard and brittle. See figure 9. The high temperatures cause a structural change to the rotor material. This condition can make the rotor more susceptible to cracking. Rotors with this condition should be replaced. Check the brake linings for uneven wear and replace as necessary. After the rotor has been replaced, and the hub and rotor reinstalled onto the axle, the brake system should be checked for brake drag and proper brake balance.
