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Brake light pressure switch problems
#1
my brake light pressure switch is leaking fluid out of the center, where the wires go, when pressure is applied to the pedal. bought a new one from ford but its doing the same thing! anyone had this happen, how did you fix it?            
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#2
I just found that mine is leaking too. Trying to get the front brakes bled is about the last hurdle I have left and I keep getting air. Discovered the leak from the pressure switch. Does anybody know if this switch is exposed to brake fluid or is it supposed to live in a dry environment pushed by a pressure valve?Huh
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#3
Yep...had the same problem. It is not the switch that is leaking but your proportioning valve. You need a rebuild kit from... https://www.musclecarresearch.com/valve-kit-kh

I installed the kit on mine and leak went away.

Jeff
1972 Q Code Convertible
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#4
jeff8877;235289 Wrote:Yep...had the same problem. It is not the switch that is leaking but your proportioning valve. You need a rebuild kit from... https://www.musclecarresearch.com/valve-kit-kh

I installed the kit on mine and leak went away.

+1 thumb
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#5
Thanks, that is what I was afraid of.
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#6
computercarguy;235291 Wrote:Thanks, that is what I was afraid of.

I did the kit and now mine is leaking at this spot. ? Does that mean I am too incompetent to rebuild a proportioning valve?
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#7
http://mustangparts.averagejoerestoratio...A_320.jpeg

might try a different type i belive 69 and 70 are the same as 71-73
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#8
Brake fluid is leaking past the O-ring seals on the ends of the piston in the center bore of the proportioning unit.

   
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#9
Bill73Ragtop;266702 Wrote:Brake fluid is leaking past the O-ring seals on the ends of the piston in the center bore of the proportioning unit.

With the new seal kit is there any chance this will go away with a few cycles of the brake system/pedal, or do I need to just buy one of the Daniel Carpenter reproductions that are out now?
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#10
I rebuilt the distribution valve on my 69 and there is no leakage (there wasn't any to begin with) so rebuilding it will not hurt it. I think new O ring seals should work unless you have damage to the bore. Rebuild kits are cheap so it's probably the way to begin. BTW - be sure to get the 'Centering Tool' which is helpful during the bleeding process.
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