Mack DMM, DM +7 more: Brakes

Affects Mack DMM, DM, MR, CH, RB, CL, CX, CV, RD · 2001 — about 992 vehicles.

The hazard

Certain heavy-duty trucks equipped with certain Meritor-Wabco brake system relay valves manufactured by Haldex Brake Systems. The valve may stick open when a high-pressure application is released. When the valve sticks open, it can result in a total loss of air from either the service or the park brake system. The driver may lose braking ability under a service application, possibly resulting in a vehicle crash. Correction: Dealers will replace these valves.

What to do

Contact your dealer; the remedy details were not included in the filing.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational