Brake Light

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Sep 16, 2004 | 11:44 PM

69highboy

Thread Starter

Freshman User

Joined: Apr 2004

Posts: 36

Likes: 0

From: Portland Or

Brake Light

Just a quick question, what trips the brake light on the lower
left of the dash? Does It go to the prop valve or Is there a
switch that I'm missing? I have a 4x4 that has It and a 2wd
that has the lens and no wiring or bulb, what gives?

Sep 17, 2004 | 12:31 AM

Jimbare

all alone in the world

Joined: Feb 2002

Posts: 2,038

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From: oklahoma

i think that is the indicator for the emergency brake only.

Sep 17, 2004 | 12:07 PM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

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From: Ohio

Mine was alwas wired to proportioning valve. If you blow a line, it would light up because the valve would trip one way or the other.

I think most of the time the valve gets stuck and won't work.

Sep 17, 2004 | 12:09 PM

pfogle

Lead Driver

Joined: Feb 2003

Posts: 8,140

Likes: 4

From: Oak Harbor, OH

It could be in the proportioning valve, or on the master cyl iteself. There is also a switch on the e-brake.

Sep 17, 2004 | 12:32 PM

user 5363849

Mountain Pass

Joined: Apr 2002

Posts: 230

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I've been wondering this one too. There's no switch on my emergency brake.

A few days ago, I was changing the turnsignal switch on my 71 F-100. I still have the wiring diagram out, and I'll try and take a look.

Mine's on too, and I've never known why.

(Yes, I know about the proportioning valve, but I've never bothered to check to see if that's it...)

Sep 17, 2004 | 03:01 PM

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

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From: Ohio

Back when I had my '70 F100, I unplugged the sender at the pro. valve. Kept the light out. I would guess the sender had failed/stuck and kept the light on.

Sep 17, 2004 | 03:31 PM

Post Fiend

Joined: Feb 2000

Posts: 5,130

Likes: 8

From: Brea CA

Emergency brake doesn't have a light or switch. There's a pressure differential valve that lights the brake light if the front or rear half of the hydraulic system fails.

See:

https://www.ford-trucks.com/forums/s...hreadid=102575

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Nov 21, 2004 | 09:35 PM

1968 F250camper

Senior User

Joined: Apr 2004

Posts: 197

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From: Chicagoland Metro area

I have the same issue as well on my '68 F250 with dual caliper disc brakes in front. They have been leaking brake fluid recently, as have the rears on the passenger side of the truck. The leaking seemed to coincide with that brake light going on. I have not been able to find a switch either to see if it was stuck on. I guess I will try to find the proportioning valve to see if there is a wire/switch there. Better yet, I guess it may also be telling me to GET THE BRAKES FIXED!!!!!