Question about 1989 Ford F 150

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I am not getting any preasure in my brakes - 1989 Ford F 150

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You have a leak. fill the brake reservoir and have a friend pump the brakes while you hop under and look for fluid coming out. if you see nothing then check your wheel cylinders in the rear brakes for wetness. if nothing there, check the calipers for leaks. on the off chance you still have not found any leak, try bleeding the brakes for air (shoot the bleeder screws with PB blaster 24 hours before trying to open them, they may still break anyway so be gentle) and if the pedal still doesn't get better then you need a new master cylinder. A Haynes manual will tell you how to replace that unit.

Posted on Oct 03, 2009

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Was the Brakes just changed, and if so was they bled. If the ABS is messing up the light would be on in the dash. If your getting back preasure when your stepping on the Brakes you could have air in system,they need bled. sometimes to reset there is a ( I call a little Nil) on brake cylinder just below where you put oil in, while someone steps on brakes you take something with a flat edge andpush the nil in at same time. It sets the equal Preasure of front to back of brake s.

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Brakes and engine are totaly diferent systems. Do you have brakes when engine is off? If so the only conection between engine and brakes could be vacume which is created by the engine stored in the chamber at the master cylinder to assist with brakes but does not overide personal brake presure only help increase braking. If trully you have less breaking preasure with the engine running then check the vacume line at the master cylinder to see if there is a vacume or maybe preasure?

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You either have a bad master cylinder or you have a LOT of air in the lines to your rear brakes.

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currpimage=0; function switch_pimage(i){ el=document.getElementById("photo" + currpimage + "a"); if(el) el.style.display="none"; el=document.getElementById("photo" + i + "a"); if(el) el.style.display="block"; currpimage=i; } currpimage_TB=0; function switch_pimage_TB(i){ el=document.getElementById("photo" + currpimage_TB); if(el) el.style.display="none"; el=document.getElementById("photo" + i); if(el) el.style.display="block"; currpimage_TB=i; } function show_backorder(){ el=document.getElementById("t2"); el.style.display="block"; } assuming that your talking about the metal '' teeth'' on the preasure plate they point towards the ******. the order is flywheel-clutch-preasure plate ( the flat face of the preasure plate, the part that looks like a brake rotor, faces the clutch and flywheel ) if this isnt what you were looking for please let me know and we will work through this.

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This is bizarre... I'm suspecting dirt in line(s). Are you bleeding correctly? Starting w/ Right rear, left rear, right front, then left front. You might try using a power bleeder also. A possible long shot, is brake proportioning valve sticking.

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a couple of simple checks first. check tyre preasures, low preasures will make the car harder to roll along the road. also, are the brakes binding?

failing this, it could be a number of different problems.

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computer does that, or you have to have enough brake fluid preasure also, check for leaking lines (brake lines). make sure fluid is full.abs system has dump valves , if there was a problem abs light would be on. but abs might lite if not enough preasure hope this helps.

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faulty preasure regulator replace unit. also check pump out put preasure and hold preasure

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from the fine with the least amount of preasure to the line with the most preasure.

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