Authorities said an initial investigation into the fatal crash at Bangor’s Fourth of July parade shows that an antique fire engine lost its braking ability when it crushed a man driving a tractor. Police said Wallace Fenlason, 63, was killed when the city’s 1930 McCann pumper hit him. The fire engine was being driven Bangor firefighter Patrick Heathcote, 29. The Portland Press Herald reports an initial police report made available Friday said Fenlason had slowed his antique tractor on the downhill incline of Water Street at the intersection with Main Street. The pumper “lost its braking ability” and struck the tractor. The report says Fenlason was ejected and landed in the road in the path of the pumper, which hit him.Bangor Police Sgt. Paul Edwards said that is from an initial report and is not substantiated.Edwards said “The complete report into this tragic accident, which includes expert investigations by the Maine State Police, the Bangor Police Departments Accident Reconstruction, James Dearing, and Criminal Investigations Detective Cliff Worcester, is not finished and should be by mid-week. This accident is a very complex five prong investigation that obviously includes much more than witness statements, that are helpful, but need vetting.” A final report is expected mid-week.