Question about 1990 Ford F150
Problem is. Intermittent and brakes are hard to stop truck
Your power brake booster has a leak. With the pedal depressed sometimes you can hear the leak coming out of apply shaft area under dash.
Posted on Apr 20, 2014
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Posted on Jan 02, 2017
SOURCE: 96 F350 Hard Brake Pedal
My '96 f350 7.3 did the same thing. It was working fine I drove to the store then came out and the brake was hard. Then it was fine then hard again......turned out to be my vacuum pump. $100 fix now it brakes fine.
Hope this helps!
Posted on Aug 24, 2008
It sounds like the shifter lock out solenoid has gone bad.It is a solenoid that releases the shifter when you push the brake pedal.
Posted on Mar 06, 2009
First look for obvious leaks under the vehicle, especially the inside area of each wheel... If you see fluid, you have either a blown cylinder seal or a bad line (check the rubber hoses to the front and back brakes too) Repair the offending part and bleed the air out of the system... (remember to clean pads or shoes if they have fluid on them)... If you see no hint of leakage anywhere, then suspect the master cylinder... if you remove the master cylinder, check and make sure that it didn't leak fluid into the brake booster diaphragm (Brake fluid will destroy the booster)... as in any repair when you open the system (lose fluid), you will need to bleed out the air to restore function... hope this helps...;-)
Posted on May 04, 2009
I don't know if this would be considered a solution or not but in 2006 Ford implemented a new transmission (6 speed automatic) and they have and still have a lot of problems. It is fixed (helped may be more appropriate) by a computer upgrade done by the dealership. MY wife has had nothing but problems out of her 2006 limited ford explorer. The whole computer system had to be replaced at 32,000 miles and then they charged us to upgrade the new computer they put into the car. It's almost comical at this point. The transmission problem has been solved for the most part on our vehichle but it took several ford computer updates. I hope this helps!
Posted on May 29, 2009
Have you tried checking your throttle positioning sensor. Possible vacuum leak or check for carbon build up in the throttle body not letting the throttle valve shut all the way.
Posted on Jul 24, 2009
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