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You have a bad seal in your break booster unit,, just behind your master break cylinder is a big roung doughnut looking thing, this unit works off vacume from the engine, it helps you push down on the break peddle so its not so tuff to stop! well on that booster unit there is a seal that keeps the unit from loosing vacume past the rod leading into your break peddle, sounds like this seal is leaking vacume .. you can replace this unit your self if you want to tackle it, its going to be some work to replace and you should probley have the manual on this truck to do the work. Hope this helps! Good Luck!
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The brake switch is usually like the switch in your trucks
doorframe that turns your dome light off. You can push in on the switch with
the door open to get a feel for how it works. Push it in and your dome light
turns off. The same thing happens with your brake light switch. When you push
on your brake peddle it is the same as your truck door being opened. When the
brake peddle, is in its home position as in no pressure on the peddle pad, the
arm of the brake peddle pushes the button in which, breaks the circuit to the
The switch could be bad. It is easy to spot the switch look
at the arm of the brake peddle and see if you can see a bracket that holds the
switch against the brake peddle arm. Use a flashlight.
You might be able to tell if the switch is bad by only
removing one of the wires and see if your brake light goes out. If your brake
lights go out with one wire removed, the switch most likely is bad.
I have also seen where a driver caught there shoe string or
shoe on or under side of the peddle and when they pull there foot up they bend the
bracket that holds the brake light switch. By bending the bracket they move the
switch away from the peddle arm and the switch no longer gets pushed in enough
to break the circuit.
A bent bracket can be an easy fix just bend the bracket back
to its original position. Please be very careful the bracket can be sharp. In
addition, the bracket can crack, to help prevent this let your truck heat up
inside if the A/C has been on etc.
You can take all of the wires off the switch and remove it.
Take the switch to your local auto parts store they should have one and will be
glad to test your existing one.
If there are more then two wires draw your self a diagram,
tag the wires with masking tape, and number them. Please be aware that you
could blow a fuse if you touch the wire ends to any metal parts of your truck.
If you do not already
have fuses in your glove box, you should pick up some while you are at the auto
parts store. Please put the fuses in your glove box. I run into many people who
say yes I have fuses, at home in there garage! I do not know about everyone
else but my truck never breaks down in my garage. I think it is scared of all
the tools around it. LOL.
there is a short circuit in the brake light wiring it could be in the lamp holders them selfs pull off the wires to the brake lights holders on all the lamps and see if it still blows a fuse if it dose then the short is in the loom not the lights them self's if it dont blow a fuse hook up one light at a time untill it starts to blow fuses again the last light to be hooked up that blows the fuse is the faulty light