Another new problem..
Thread Starter
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Elder User
Joined: Jul 2008
Posts: 557
Likes: 0
Another new problem..
I'm starting to get frustrated with this truck... Today right before I came to a complete stop my brake light came on and is still on?? I checked my master cylinder and it's full, the brakes feel great so what gives? Why all of a sudden the light come on now???
More Turbo
Joined: Aug 2007
Posts: 555
Likes: 2
From: Washington state
Possible faulty wiring? Would be the last thing I looked at. I would look at what 75F350 said but checking the brake light wiring circuit is cheap, and with the proper wiring schematic should be quick.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
C8AZ2B264A .. Plastic "Low Brake Fluid Warning Light Switch" screws into the brake proportioning valve.
What happens to it: Cracks develop in the threads, and when that occurs, brake fluid seeps out, the low brake fluid warning light on the dash comes on...and stays on!
This switch fits ALL 1968/79 F100/350's, 1968/72 passenger cars, 1968/79 Bronco's and 1969/79 Econolines.
While it's available from Ford, every autoparts store should carry it.
You live in Bloomington, IL correct?
According to the Ford Dealer Parts Locator System, DENNISON FORD in Bloomington IL has one.
What happens to it: Cracks develop in the threads, and when that occurs, brake fluid seeps out, the low brake fluid warning light on the dash comes on...and stays on!
This switch fits ALL 1968/79 F100/350's, 1968/72 passenger cars, 1968/79 Bronco's and 1969/79 Econolines.
While it's available from Ford, every autoparts store should carry it.
You live in Bloomington, IL correct?
According to the Ford Dealer Parts Locator System, DENNISON FORD in Bloomington IL has one.
Thread Starter
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Elder User
Joined: Jul 2008
Posts: 557
Likes: 0
wouldn't that affect the brakes though?
Thread Starter
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Elder User
Joined: Jul 2008
Posts: 557
Likes: 0
C8AZ2B264A .. Plastic "Low Brake Fluid Warning Light Switch" screws into the brake proportioning valve.
What happens to it: Cracks develop in the threads, and when that occurs, brake fluid seeps out, the low brake fluid warning light on the dash comes on...and stays on!
This switch fits ALL 1968/79 F100/350's, 1968/72 passenger cars, 1968/79 Bronco's and 1969/79 Econolines.
While it's available from Ford, every autoparts store should carry it.
You live in Bloomington, IL correct?
According to the Ford Dealer Parts Locator System, DENNISON FORD in Bloomington IL has one.
What happens to it: Cracks develop in the threads, and when that occurs, brake fluid seeps out, the low brake fluid warning light on the dash comes on...and stays on!
This switch fits ALL 1968/79 F100/350's, 1968/72 passenger cars, 1968/79 Bronco's and 1969/79 Econolines.
While it's available from Ford, every autoparts store should carry it.
You live in Bloomington, IL correct?
According to the Ford Dealer Parts Locator System, DENNISON FORD in Bloomington IL has one.
I just want to make sure I don't loose my brakes going down the highway.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Bill, when these crack would the crack be big enough for it to leak? I looked under the truck and didn't see any spots on the ground. Plus it's too dam cold to lay under there right now I'm just calculating how much time I have to get it fixed. Thanks for your information, I'll be picking it up in a couple of days.
I just want to make sure I don't loose my brakes going down the highway.
I just want to make sure I don't loose my brakes going down the highway.
All it takes for this switch to go bad is tiny cracks in the threads.
The fluid then seeps out, the low brake fluid warning light on the dash comes on, and stays on.
I prolly sold at least 500 of these same switches over the course of 29 years (1968/97).
MSRP: $33.64 / FTEpartsguy.com price: $18.17
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Post Fiend
Joined: Jul 2006
Posts: 6,948
Likes: 44
What I was getting at, is that the function of the valve itself could be a problem. This light is designed to illuminate when there is a low pressure situation, and this can happen if one of the circuits gets low. The plunger will move to the low side and illuminate the dash light. You can make a tool for this, or it can be done with a set of picks.
Perhaps the switch is bad, and hopefully this is the case, as this would be the easiest fix. I did not read that there was a leak, and often times if the switch is busted, it will leak, though not all of the time.
This is about a 50 /50 deal. It could be the switch itself, and it could be the plunger. Either way, you are on the right track, and should be able to narrow this down.
Perhaps the switch is bad, and hopefully this is the case, as this would be the easiest fix. I did not read that there was a leak, and often times if the switch is busted, it will leak, though not all of the time.
This is about a 50 /50 deal. It could be the switch itself, and it could be the plunger. Either way, you are on the right track, and should be able to narrow this down.
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Any type of leak in the brake system can cause that light to come on. And it don't take much.
Another culprit that can cause this is leaky wheel Cylinders on the rear of the truck.
Would not hurt to do a full brake inspection after replacing the switch.
Remove the Rear wheels, then remove the brake drums and check the wheel cylinders for leaks. then you can check the shoes etc...
Good Luck.
Another culprit that can cause this is leaky wheel Cylinders on the rear of the truck.
Would not hurt to do a full brake inspection after replacing the switch.
Remove the Rear wheels, then remove the brake drums and check the wheel cylinders for leaks. then you can check the shoes etc...
Good Luck.
Cargo Master
Joined: Mar 2008
Posts: 2,409
Likes: 1
From: Goliad, Texas
x2....replace it now. don't drive it a couple more days. remember it's your and everyone on the road around you's life on the line if your brakes fail. or you can leave it alone IF you don't drive that truck until you fix it.