hey everyone wondering if anyone has had this happen..my 74 f-100 360 with manual brakes...changed the m/c lastnight,but the sensor on the proportioner is still leaking fluid from it really badly,replaced the sensor with another and still leaks threw it losing fluid, the light inside isn't lite.the sensor is the one attaching to the brake indicator light in the ins panel,thx in advance larry

 

Your proportional valve is bad. There should be no fluid in the switch area. Just the valve that slides one way or the other when one side of the system fails. If you have fluid in the switch area, replace the proportional valve.

 

Here is the part you mention for the 78/79 truck.

https://www.ford-trucks.com/user_gal...=69926&width=2

 

[I][B]t/y very much guys your always a huge help, it's always great to ask people who've ran into the problems already it saves loads of time when you have the problems you guys have already solved the link helped wonderfully Mil1...thx again larry