| 摘要 |
An engine compression brake system in which an automatic transmission is down shifted to second gear and to low gear on moderate to heavy braking pressure applied to the brake pedal. The down shifting may be electrically actuated by pressure actuated switches which are exposed to the hydraulic pressure in the conventional brake system, by flexible cables which are moved by a piston system actuated by the hydraulic pressure in the conventional brake system and by mechanical linkage controlled by a separate foot pedal.
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