I was driving the maverick and when I hit the brakes the were fine till I put constant pressure on them and then they went soft and the pedal dropped. I checked all the wheels and no leaks, didnt see any leaks from the master cylinder but the fluid level was low so I topped it off. When I looked over at the Pressure Differential Warning Valve it had fluid around and some of the lines running into it were wet? I ordered a new master cylinder today so hopefully I get that changed monday. If that doesnt work where can I get a Pressure Differential Warning Valve? Or any other suggestions of what the problem could be? Thanks
it is the brake warning light switch. should be able to fin da good used one in the junkyard by matching the plug. ford used the same style for years.
There is a seal where the switch,where the wire connects,screws into the valve. It may be where it is leaking. Try to clean off the valve,brake cleaner will do this pretty well. Then have someone hold down the brake and watch where the fluid comes from. It's either the lines or the switch!
I had this same issue with my car years ago.I replaced the switch a few times, and got tired of bleeding the brakes every time i did it.Soo I went and got a stud and plugged it.
If you do anything, buy the replacement valve. Do NOT plug the switch chamber and "think" you'll be OK because you won't! "who_leeroc" apparently has a blown valve that's leaking fluid between the front and rear circuits, and plugging the switch chamber will do absolutely nothing for the safety of his brakes. If you look at the diagram, the switch is activated by a floating piston with a groove in it that gets "off-center" whenever either the front or rear circuit sees a large enough pressure imbalance. The only thing that could cause fluid to leak from the switch area is a blown o-ring seal at either end of the piston. That right there tells you that you need a replacement valve, not a "plug"! Don't take a chance on your brakes for you own safety and that of others.
How do you replace the pistons O ring seals where the Pressure Differential Warning Valve sits on top? I'm not familiar with cars... I was coming home from work and the car left me with no brakes.. I was stepping on the brake pedal to the floor and it wouldn't stop. I ended stopping by hitting my honda.. Anyway I got out of the car and I open the hood and saw all the lil pipes wet where the Pressure Differential Warning Valve sittings on... I took off the cap with a wire from the pdwv and it had brake fluid coming out.i told my wife to step on the brake pedal while I looked at the pdwv and sure enough fluid started to rise. Not sure what it might be... Either the pdwv or the piston o rings below it... All it had brake fluid coming out from the right rear wheel... Weird thing is that the e braked worked... Thanks for any advice. P.s I bought this car from my wife dad ... They both clam that prior to stopping you have to pump the brakes a bit to make the pedal have some softness with pressure... But to me that doesn't sound right nor safe...
...:Handshake you have multiple problems. E-brake is mechanical...if the cable is hooked up it will work. fluid from the switch...switch needs to be replaced. fluid coming out from the right rear wheel...you need...wheel cylinder. pumping brake pedal...should not have to pump pedal to have brakes...not safe.
