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Old 08-07-2015, 04:19 PM   #21
1931 flamingo
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Default Re: 1939 ford brake lights stuck on

Is the rod from the brake pedal to the m/cyl too long??
Paul in CT
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Old 08-07-2015, 07:48 PM   #22
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Default Re: 1939 ford brake lights stuck on

1931 flamingo has my idea also.
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Old 08-07-2015, 08:00 PM   #23
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Default Re: 1939 ford brake lights stuck on

Same rod and adjustment same master cyl . Going to jack it up tomorrow and check that. It's got me stumped. It's been working last 10 years
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Old 08-08-2015, 02:11 PM   #24
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Default Re: 1939 ford brake lights stuck on

Well Checked rod Rod Ok (also adj rod loose) I would say its the master cyl Now after it sets a while Lights will go off All brakes and every other thing works correct Master cyl Sticking on press release for switch Thanks for all help Now I know whats going on
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Old 08-08-2015, 04:16 PM   #25
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Default Re: 1939 ford brake lights stuck on

Quote:
Originally Posted by cs39ford View Post
Well Checked rod Rod Ok (also adj rod loose) I would say its the master cyl Now after it sets a while Lights will go off All brakes and every other thing works correct Master cyl Sticking on press release for switch Thanks for all help Now I know whats going on
I wish I could tell what you did when is rod loose now was it tight before was it keeping master Cylinder from returning was switch still pressurized i wish we could understand exactly what you started with and what you did one slow step at a time what is Master cyl Sticking on press release for switch mean can you write in full sentences with some punctuation so WE can make SOME sense of what you are actually doing making my head hurt?
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Old 08-08-2015, 04:26 PM   #26
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Default Re: 1939 ford brake lights stuck on

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Are you using DOT 5 silicone fluid?
It has been known to affect pressure switches.
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Old 08-08-2015, 05:20 PM   #27
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Default Re: 1939 ford brake lights stuck on

Bruce I am using DOT 3 Brake Fluid. That s all they sell at auto parts store by me. When I checked brake rod it was just touching, So I backed it off a little ,So now it is loose. Now if you drive car and park it ,brake lights stick on for a while(like ten minutes or so) So I am thinking Press release in Master Cyl. is sticking or something. So for now I sent back New master cyl. that I got for exchange one. The new one was new not rebuilt, But would not hold pres. I did notice at front plunger that one was leaking a little. It was wet with brake fluid when I removed it. Since I put old master cyl. back on I have good brakes, no leaks, But like I said brake lights stick on for a while now. Just going to wait till I get the exchange one and start over again Its been a pain in the Butt .
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Old 08-08-2015, 05:26 PM   #28
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Default Re: 1939 ford brake lights stuck on

Make sure the pedal is adjusted so that the plunger in the MC comes back far enough for the fluid to return to the MC reservoir. You can look down in the fill hole and you should see the bleed back hole down on the plunger.
IF this adjustment is not right it could cause pressure to remain in the system.
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Old 08-08-2015, 06:38 PM   #29
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Default Re: 1939 ford brake lights stuck on

The cap on most master cylinders have a small hole for it to vent, Could the vent be plugged up? It does need to vent or it will hold a certain amount of pressure.
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Old 08-08-2015, 08:29 PM   #30
cs39ford
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Default Re: 1939 ford brake lights stuck on

I drove it around a little today. Lights are sticking on for a couple minutes now. It's getting better. But do not know the problem. At least I can still use it.
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Old 08-08-2015, 08:48 PM   #31
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Default Re: 1939 ford brake lights stuck on

Your problem is your brake rod that goes from the pedal and into the master cylinder...shorten it a few turns and this will release the holding pressure...
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Old 08-08-2015, 09:47 PM   #32
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Default Re: 1939 ford brake lights stuck on

I had a similar problem with mine.Everything worked fine when car was cool. After short drives, I had the brakes getting hot dragging and the brake lights sticking on and coming on after car was parked. The heat under the hood would make mine come on. I checked this by heating the master cylinder with a heat gun. Turns out the bleed hole in front of the main inlet was stopped up on mine. When I rebuilt the MC I over looked the hole it is so small. I found a bit the right size and drilled the crud out and all has been well since.
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Old 08-08-2015, 10:13 PM   #33
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Default Re: 1939 ford brake lights stuck on

This happened all the time with me until I wrapped the brakelines closest to the exhaust pipes with a small insulating fiberglass sock.
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Old 08-08-2015, 10:19 PM   #34
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Default Re: 1939 ford brake lights stuck on

Those are two good things that I will check out for sure
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