Meanwhile, Dar gathered information.

The school bus was a 1989 model TC-2000 manufactured by the Blue Bird Body Company and purchased new by the Desert Springs School District. It had power steering, a diesel engine, and a model AT 545 four-speed automatic transmission from the Allison Transmission Division of General Motors. It was also equipped with a Federal Motor Vehicle Safety Standards (FMVSS) 121-approved dual air-mechanical, cam-and-drum brake system that had front axle clamp type-20 brake chambers and rear axle clamp type-24/30 and emergency/parking brake chambers. All of the brakes had 5.5-inch manual slack adjusters.

The driver seat was lap-belt-equipped; the passenger seats were not. Dar knew that this was standard design for school buses. Parents who would never allow their children to ride unrestrained in their family vehicles happily waved good-bye to their children each morning in buses carrying fifty children and no passenger belts or harnesses. The estimated gross weight of this bus, the passengers, and their camping baggage was 22,848 pounds.

The driver had—as the newspapers and TV reports had put it—“a perfect safety record with the district.” Blood tests taken at the hospital immediately after the accident showed no evidence of drugs or alcohol. Dar interviewed her two days after the accident, and her account was almost word for word the same as the deposition she had given the CHP the evening of the crash. She reported that about one mile from their starting point, on a slight downhill grade, the bus brakes had “seemed weird and mushy.” She had pumped the brake pedal. A warning light had come on, indicating low brake pressure. At that point, the driver told him, the grade had changed from the downhill grade to a two-mile uphill climb and the bus began to slow. The automatic transmission had shifted to a lower gear and the brake warning light went off and then blinked a few times. The driver said that she assumed the problem had fixed itself at this point and that there was no reason not to continue.