Reported risk: On certain buses with remote mounted master cylinder reservoirs galvanic corrosion on the die cast adapter plate causes distortion of the wagon wheel seals that are mounted on the adapter plate. If the seals become distorted, the tipper valves cannot properly seat against the wagon wheel seals. If the tipper valves cannot seat completely, the fluid can back flow past the valves towards the reservoir and create a pressure loss for the front brakes, the rear brakes or both. This condition can result in an extended stopping distance without warning to the driver and the driver may feel the pedal fade or go completely to the floor, increasing the risk of a crash. Correction: All vehicles are to be inspected and the master cylinders found to have the original die cast adapter plate design will be replaced with a new design.
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