Question about 1987 Ford Ranger
When I barely touch the brake pedal, the pedal depresses itself and a vacuum leak sound comes from under the hood. additionally, when the pedal is depressed firmly, the engine slows and almost dies.
By the sound of this the brake booster is leaking fix the vacuum leak or replace the brake booster and all will be ok
Posted on Feb 17, 2012
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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
the brake switch may be failing, causing the gears to stay in a locked position making it hard to shift into park
Posted on Dec 27, 2008
SOURCE: For Expedition 99 150K miles
Cloged cataylatic converter. You can check this by removeing the O2 sensor before the "cats" and you WILL notice "normal operation". Granted it will be loud but it will safely get you by untill you can get to a muffler shop to replace or do what ever means necessary to "unclog" ;-) the cats, becuase on an Expedition, having 4 cats at most that might need to be replaced equals around $1500.
Posted on Feb 21, 2009
SOURCE: 2005 Ford Escape Hissing sound
The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.
Posted on Jul 02, 2009
check to see if the brake switch is loose, get on your knees press the brake pedal down and look at the brake switch on the brake arm and see if you can wiggle the switch, if you can that is your problem and is a common one for ford they use a plastic threaded switch, 90% do now days.
Posted on Nov 22, 2009
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