Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 02-08-2015, 10:19 AM   #1
Sal
Senior Member
 
Join Date: May 2010
Posts: 167
Default silicone brake fluid proof brake light switch

The silicone brake fluid I use in my early Ford ruined the original stop light switch. Some one said Harley Davidson has a switch that will go on the master cylinder that holds up to silicone brake fluid. Does anyone know the H-D part number for it?
Sal is offline   Reply With Quote
Old 02-08-2015, 10:36 AM   #2
flathead48
Senior Member
 
Join Date: May 2010
Location: Saratoga Springs, NY
Posts: 681
Default Re: silicone brake fluid proof brake light switch

Sal, I have been using the HD for years, can't remember the part number but bring the Ford switch in and they will match it. If I remember the ends on your wires will have to be changed for the HD switch. Regards, Rick
flathead48 is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 02-08-2015, 10:41 AM   #3
Sal
Senior Member
 
Join Date: May 2010
Posts: 167
Default Re: silicone brake fluid proof brake light switch

Thank you for the information.
Sal is offline   Reply With Quote
Old 02-08-2015, 10:42 AM   #4
38 coupe
Senior Member
 
38 coupe's Avatar
 
Join Date: May 2010
Location: South Texas
Posts: 709
Default Re: silicone brake fluid proof brake light switch

How did the stop light switch fail? Quit switching, start leaking, plugged up with gunk? Several of the local guys are running silicone fluid and I'd like to know what to look for.

Thanks!
38 coupe is offline   Reply With Quote
Old 02-08-2015, 10:52 AM   #5
V8COOPMAN
Senior Member
 
V8COOPMAN's Avatar
 
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 5,218
Default Re: silicone brake fluid proof brake light switch

Quote:
Originally Posted by Sal View Post
The silicone brake fluid I use in my early Ford ruined the original stop light switch. Some one said Harley Davidson has a switch that will go on the master cylinder that holds up to silicone brake fluid. Does anyone know the H-D part number for it?
Suggestion below! DD

Ron Francis sells a silicone compatible switch that has been mentioned here several times.

http://www.ronfrancis.com/prodinfo.asp?number=SW%2D32



Item Number: SW-32Unit Price: $28.95In Stock
__________________
T5 W/TORQUE TUBE


I may not be the BEST, but I'll do 'til he gets here!




V8COOPMAN is offline   Reply With Quote
Old 02-08-2015, 10:59 AM   #6
ken tx
Junior Member
 
Join Date: Mar 2012
Posts: 8
Default Re: silicone brake fluid proof brake light switch

H D brake light switch #72023-51C made in USA.
ken tx is offline   Reply With Quote
Old 02-08-2015, 11:20 AM   #7
V8COOPMAN
Senior Member
 
V8COOPMAN's Avatar
 
Join Date: May 2010
Location: East Shore of LAKE HOUSTON
Posts: 5,218
Default Re: silicone brake fluid proof brake light switch

Quote:
Originally Posted by ken tx View Post
H D brake light switch #72023-51C made in USA.
The info I've read suggests that 72023-51C has been superceded by a -51D in 2006 because of this very issue......MY understanding only. DD
__________________
T5 W/TORQUE TUBE


I may not be the BEST, but I'll do 'til he gets here!




V8COOPMAN is offline   Reply With Quote
Old 02-08-2015, 11:40 AM   #8
TJ
Senior Member
 
TJ's Avatar
 
Join Date: May 2010
Location: Napa,California
Posts: 3,998
Default Re: silicone brake fluid proof brake light switch

I always use the mechanical lever switch that was used on the older Chev. pickups. Never had a problem with them.
TJ is online now   Reply With Quote
Old 02-08-2015, 12:37 PM   #9
alanwoodieman
Senior Member
 
Join Date: May 2010
Location: upstate SC
Posts: 2,003
Default Re: silicone brake fluid proof brake light switch

I have had two of Ron Francis's swithes fail, so far none of the HD switches have failed? when they failed the silicon got thru the seperation and hydro locked making the switch not work-how do I know this, I drilled on of the switches and fluid ran out, after letting the fluid out the switch worked
alanwoodieman is offline   Reply With Quote
Old 02-08-2015, 04:25 PM   #10
Sal
Senior Member
 
Join Date: May 2010
Posts: 167
Default Re: silicone brake fluid proof brake light switch

I want to thank all of you who replied.
Sal is offline   Reply With Quote
Old 02-08-2015, 04:40 PM   #11
37 Coupe
Senior Member
 
37 Coupe's Avatar
 
Join Date: May 2010
Posts: 1,562
Default Re: silicone brake fluid proof brake light switch

Quote:
Originally Posted by alanwoodieman View Post
I have had two of Ron Francis's swithes fail, so far none of the HD switches have failed? when they failed the silicon got thru the seperation and hydro locked making the switch not work-how do I know this, I drilled on of the switches and fluid ran out, after letting the fluid out the switch worked
My situation exactly the opposite two failed Harley D switches and been running the Ron Francis switch successfully last 5 years. Odd. Make sure the ron Francis switch is the silicon compatible one.
__________________
"Never complain,never explain"... Henry Ford II
37 Coupe is offline   Reply With Quote
Old 02-08-2015, 07:57 PM   #12
RandyZ
Member
 
Join Date: Jan 2013
Location: Murillo, Ont.
Posts: 87
Default Re: silicone brake fluid proof brake light switch

I went through 2 or 3 of those Harley switches as well. Soon as they leak a little, it contaminates the contacts. I finally gave up and rigged a mechanical switch in front of the brake linkage. Problem solved!
RandyZ is offline   Reply With Quote
Old 02-08-2015, 08:56 PM   #13
Binx
Senior Member
 
Join Date: Oct 2011
Location: Gloucester VA
Posts: 1,042
Default Re: silicone brake fluid proof brake light switch

So the moral to this thread's story like others similar is DOT-5 silicone brake fluid sucks and don't use it in your old vehicle. Keep using the lesser DOT spec and change it periodically like you do your other fluids. Got it.

Lonnie
Binx is offline   Reply With Quote
Old 02-09-2015, 09:53 AM   #14
Gary in La.
Senior Member
 
Gary in La.'s Avatar
 
Join Date: May 2010
Location: Louisiana
Posts: 799
Default Re: silicone brake fluid proof brake light switch

I've had silicon brake fluid in my '46 for 25 + years and have had no issues. Replaced brake switch one time due to being inop. I use NOS Delco 4766 switches. Have'nt used the new replacements.
Gary in La. is offline   Reply With Quote
Old 02-09-2015, 10:03 AM   #15
Tony, NY
Senior Member
 
Join Date: May 2010
Location: Capital of Corruption , NY
Posts: 659
Default Re: silicone brake fluid proof brake light switch

I've had silicone brake fluid and same switch for over 12 yrs and no problems. Can't remember where I got the switch. Probably NAPA.
Tony, NY is offline   Reply With Quote
Old 02-09-2015, 10:55 AM   #16
TagMan
Senior Member
 
Join Date: Jul 2011
Location: Alvaton, Kentucky, USA
Posts: 873
Default Re: silicone brake fluid proof brake light switch

I bought an original '37 Chevy in 1993, flushed the system and installed Silicone brake fluid. I never changed the brake light switch at that time or since. I drain & install new DOT5 fluid about every 7-years or so, changed brake shoes and one drum in the interim, but I still have the same brake light switch installed.

I have no idea if it's the one that came from the factory, but I do know it was old when I got the car in '93 and it's never missed a beat in 21-years and thousands of miles of driving.
TagMan is offline   Reply With Quote
Old 02-09-2015, 12:39 PM   #17
37 Coupe
Senior Member
 
37 Coupe's Avatar
 
Join Date: May 2010
Posts: 1,562
Default Re: silicone brake fluid proof brake light switch

Quote:
Originally Posted by Binx View Post
So the moral to this thread's story like others similar is DOT-5 silicone brake fluid sucks and don't use it in your old vehicle. Keep using the lesser DOT spec and change it periodically like you do your other fluids. Got it.

Lonnie
Well you make it sound easy to eliminate the brake switch problem but I think silicon brake fluid is well worth the glitch. Try to make a long story short but I know it won't happen. Forty years ago when I had my block garage shop built and I didn't get it properly insulated or heated at first I had a lot of issues with moisture especially during "January thaws". Actually the "46 Ford coupe I had at the time had issues sweating in the damp condensation when high and low temps meet. I had problems with every wheel cylinder sticking in a very short period of time,one time I burnt paint or bubbled it off the wheel itself around wheel stripes before I got back home. Went through a lot of brake line cleaning,reworking cylinders etc. Really didn't know much about silicon brake fluid back then and never used it on the 46 but I did on the next project a '53 F-100.By then in the early eighties some info like in Old Cars Weekly addressed its merits. Just recently the man who bought the '53 from me in 1990 called and asked about the electric fuel pump that went bad. I told him it was probably the ethanol gas that probably ate it up,surprised,shocked actually when he told me the gas in the tank was what I had put in,he never drove or even started the engine. So fuel problem issue is a no brainer.His pole barn was uninsulated or heated truck had other issues it sounds like,rodents etc,what a shame. Finally the moral to my story, brakes he said seems to be fine,nothing stuck as rolled truck outside. Silicon brake fluid I installed in the eighties,not one cylinder (piston) stuck. I doubt if the original type switch works as at that time I wouldn't have had an option. I will accept the once in awhile failure well over a complete brake rework. Again the only failures I have had were a couple original switches and two HD ones.
__________________
"Never complain,never explain"... Henry Ford II
37 Coupe is offline   Reply With Quote
Old 02-09-2015, 12:58 PM   #18
FlatheadTed
Senior Member
 
FlatheadTed's Avatar
 
Join Date: May 2010
Location: Auckland
Posts: 4,047
Send a message via AIM to FlatheadTed
Default Re: silicone brake fluid proof brake light switch

We are going through this same problem ,wheel cylinders were sleeved in stainless new cups but the silicone fluid is leaking past ?? We think to course of a honing pattern .Ted
__________________
http://www.flatheadted.com
FlatheadTed is offline   Reply With Quote
Old 02-09-2015, 04:22 PM   #19
Ian NZ
Senior Member
 
Ian NZ's Avatar
 
Join Date: May 2010
Location: Taranaki, New Zealand
Posts: 795
Default Re: silicone brake fluid proof brake light switch

I had a lot of problems with the brake cylinders, I had to even replace the master cylinder as the bore was so rusty with using the ordinary brake fluid in our 1947 Ford coupe in the 1970's, as the car was not used regularly. So I replaced the brake fluid with silicone fluid and have had no trouble since. I also have had trouble with the brake light switches and since I have replaced it with a Harley Davidson switch I have had no more problems. What I have found since our coupe is not used very often every month or two it is best to give the brake pedal a pump up to bring the pedal up and to make sure every thing is ok.
Ian NZ is offline   Reply With Quote
Old 02-09-2015, 04:26 PM   #20
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 12,944
Default Re: silicone brake fluid proof brake light switch

Quote:
Originally Posted by FlatheadTed View Post
We are going through this same problem ,wheel cylinders were sleeved in stainless new cups but the silicone fluid is leaking past ?? We think to course of a honing pattern .Ted
Bad cups? Have you considered a residual valve to maintain some pressure on the wheel cylinders?
JSeery is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 07:32 PM.