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EFV-8 Club Forum / General Ford Discussion / Brake switch

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Posted By Discussion Topic: Brake switch -- page: 1 2     TomO 12-26-2021 @ 10:05 AM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 Tmusk, There have been many discussions about silicone brake fluid and you can find them by clicking on the SEARCH box on the Forum banner, Type in "Silicone brake fluid" in the search box and then go to the "In The Past" drop down menu and click ALL then click search. There is no "best" fluid for all situations. The synthetic dot 3 / 4 fluids have a slight edge over the non-synthetic fluids in boiling point. If you change to silicone (DOT 5) fluid, flush the metal lines with denatured alcohol before connecting them to new wh*ll or master cylinders and make sure that all rubber parts are replaced. Tom Tmusk 12-25-2021 @ 9:50 AM reply profile send p.m. Member Posts: 9 Joined: Nov 2021 My apologies for jumping in on someone else's post but I'd like to know more about the best brake fluid to use. I just bought a 47 with what look like very new brake lines, hoses and fittings. Not sure about the master and wheel cylinders although the master looks new also. No information from previous owner. However, the driver's front wheel cylinder and master cylinder are both leaking and the master body is starting to rust due to the leaking brake fluid. Hence, I think this might be a good time to just overhaul the whole system and change to silicone or whatever the best product is. I realize that any part not replaced must be thoroughly flushed before changing over to silicone but I'm not sure about some of the synthetics. My questions are, what is the best fluid and what is the best solution and procedure for flushing the system? silverchief 10-21-2021 @ 10:07 AM reply profile send p.m. Senior Posts: 521 Joined: Oct 2009 The switch I received from our California vendor was bad. Was pleasantly surprised to find my local NAPA store had the correct switch, obviously of much better quality, and minus any shipping charges. Now my brake lights work fine. JayChicago 10-21-2021 @ 9:35 AM reply profile send p.m. Member Posts: 480 Joined: Jan 2016 Silverchief You are right. I should have thought of that. My post was foolish. silverchief 10-20-2021 @ 3:57 PM reply profile send p.m. Senior Posts: 521 Joined: Oct 2009 Jay, What is really foolish, is criticizing a members thread without knowing what handicaps he may be working with. alanwoodieman 10-18-2021 @ 10:09 AM reply profile send p.m. Senior Posts: 868 Joined: Oct 2009 he needs a low pressure switch, such as HD or Ron Francis--which I am using in at least 5 cars with synthetic fluid with no problem get some one to apply the brakes like he was doing a panic stop and really applying the brakes and see if the light comes on JayChicago 10-18-2021 @ 9:13 AM reply profile send p.m. Member Posts: 480 Joined: Jan 2016 Original poster said: "Verified the circuit is good by jumping the two wires while off the switch." We should all re-read the posts before jumping on the keyboard. We all like to see our posts in print, but if we post too quickly we can wind up looking foolish. 37RAGTOPMAN 10-17-2021 @ 6:47 AM reply profile send p.m. Senior Posts: 1960 Joined: Oct 2009 silver chief with the key on, check to see if electricy is on the one wire,[ With a TEST LIGHT, ] if so, then use a jumper wire and cross both termials, does the brake lights work, ? if they do the switch is bad, if they do not remove the taillight bulbs and test them, and with the test light check the brake light terminals for electricty if have electric anc bulbs are good , try a ground with from tallight to a good ground, that you know of, even if you have to run a wire to the battery. you might have a bad ground or corroded termials no allowing a good contunity, this happens and causes dim lights, try buying a NOS U.S.A. made switch, try SOUTHSIDE OBSOLETE in MINN, try staying a away from foreign made parts, all they do is cause problems, Lets hear how you made out, my 2 cents 37 Ragtopman how old is the wiring in the car, ? you might have to check all the bullet connections, TomO 10-16-2021 @ 8:46 PM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 You can test the switch with your voltmeter. One terminal will always have voltage and the other will have voltage when you press the brake pedal. Connect your voltmeter black lead to the terminal that does not have voltage and press the brake pedal while watching the meter Tom Mr Rogers 10-16-2021 @ 8:31 PM reply profile send p.m. New Member Posts: 106 Joined: Jul 2019 Check for ground.

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