Question about 1999 Ford Super Duty F 550
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Posted on Jan 02, 2017
SOURCE: 1980 ford f700 electric brake
If the vehicle is equipped with a separate hydro boost pump, it could be going bad. If the pump isn't supplying the proper pressure to the hydro booster then the electric motor will continue to run. there is also a relay beneath the hydro boost/master cylinder assembly that could be sticking. The motor is there to supply braking assist pressure when the engine powered pump is not running.
Posted on Nov 02, 2008
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