Parking brake light! - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 12-17-2017, 11:20 AM Thread Starter
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Parking brake light!

So when I turn my truck to the on position(engine off) as usual all my dash light will go on/off to show proper function, but recently my parking brake light wont go out. Usually the parking brake light will go out after a few seconds but mine will stay on until i start the truck, then the light will go out.
I dont have my parking brake on and ive already pull it up by hand to make sure its not on.
I have checked my fluid level and it is to the fill.
My brake pedal isn't hard so i dont think its a vacuum issue.
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post #2 of 16 Old 12-17-2017, 01:35 PM
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It's not a "parking brake" light. It's a brake FAILURE light. Its most important function is to warn you of imminent hydraulic failure. Even if the level isn't low, check for hydraulic leaks over the entire system.

If that's eliminated, one possibility is that the switch on the parking brake pedal/release mechanism is stuck. You can try disconnecting it and see if that turns off the light. If so, that switch is suspect. Ford doesn't sell it separately, claims it's only serviceable by replacing the whole assembly. But I know there are sellers out there selling the switch separately, on eBay and/or Amazon. You just have to do some digging.
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post #3 of 16 Old 12-17-2017, 01:38 PM
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Test the vacuum switch, mine failed.

97 F350 XL std cab, zf5, srw (converted), 4wd, 3.55s, stock wheels/tires & rebuilt 9.18
2 Donaldsons, 3" dp, ACs, T500, HV LPOP, Hydra w/PHP, DIY 60 gl tank w/6 gl sump, eFuel/Cat filters, Aeromotive RR, Auber instruments, 140v IDM, KC 300X 63/70/84, boost fooler, RiffRaff bellowed up pipes, 6.0 IC, 3" plenums w/RiffRaff inserts & SB 425HD
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post #4 of 16 Old 12-17-2017, 01:40 PM Thread Starter
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Quote:
Originally Posted by madpogue View Post
It's not a "parking brake" light. It's a brake FAILURE light. Its most important function is to warn you of imminent hydraulic failure. Even if the level isn't low, check for hydraulic leaks over the entire system.

If that's eliminated, one possibility is that the switch on the parking brake pedal/release mechanism is stuck. You can try disconnecting it and see if that turns off the light. If so, that
switch is suspect. Ford doesn't sell it separately, claims it's only serviceable by replacing the whole assembly. But I know there are sellers out there selling the switch separately, on eBay and/or Amazon. You just have to do some digging.

How would i go about checking a hydraulic leak?
Also using my parking brake doesn't turn the light on.
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post #5 of 16 Old 12-17-2017, 01:41 PM Thread Starter
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Test the vacuum switch, mine failed.
Where is the vacuum switch located and how can i test it?
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post #6 of 16 Old 12-17-2017, 01:48 PM
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It's actually the "low vacuum warning switch" mounted on the fender liner under the brake master cylinder. It looks similar to a tuna can. Pull the electrical connector off and check if the light goes out? I got one from a salvage yard for $5.

97 F350 XL std cab, zf5, srw (converted), 4wd, 3.55s, stock wheels/tires & rebuilt 9.18
2 Donaldsons, 3" dp, ACs, T500, HV LPOP, Hydra w/PHP, DIY 60 gl tank w/6 gl sump, eFuel/Cat filters, Aeromotive RR, Auber instruments, 140v IDM, KC 300X 63/70/84, boost fooler, RiffRaff bellowed up pipes, 6.0 IC, 3" plenums w/RiffRaff inserts & SB 425HD
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post #7 of 16 Old 12-17-2017, 01:57 PM Thread Starter
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Originally Posted by MeTo View Post
It's actually the "low vacuum warning switch" mounted on the fender liner under the brake master cylinder. It looks similar to a tuna can. Pull the electrical connector off and check if the light goes out? I got one from a salvage yard for $5.
When the truck is off I have pumped the brake pedal till it doesnt move, and it will still be like that when I try to press on the brake 8 hours later(with the truck off)
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post #8 of 16 Old 12-17-2017, 02:09 PM
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The low vacuum switch sense the level of vacuum for the brake booster and climate control. If the switch has failed, the light will light.

97 F350 XL std cab, zf5, srw (converted), 4wd, 3.55s, stock wheels/tires & rebuilt 9.18
2 Donaldsons, 3" dp, ACs, T500, HV LPOP, Hydra w/PHP, DIY 60 gl tank w/6 gl sump, eFuel/Cat filters, Aeromotive RR, Auber instruments, 140v IDM, KC 300X 63/70/84, boost fooler, RiffRaff bellowed up pipes, 6.0 IC, 3" plenums w/RiffRaff inserts & SB 425HD
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post #9 of 16 Old 12-17-2017, 02:10 PM
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For some reason, my brake light switch would come on and go off intermittently until I replaced it.

97 F350 XL std cab, zf5, srw (converted), 4wd, 3.55s, stock wheels/tires & rebuilt 9.18
2 Donaldsons, 3" dp, ACs, T500, HV LPOP, Hydra w/PHP, DIY 60 gl tank w/6 gl sump, eFuel/Cat filters, Aeromotive RR, Auber instruments, 140v IDM, KC 300X 63/70/84, boost fooler, RiffRaff bellowed up pipes, 6.0 IC, 3" plenums w/RiffRaff inserts & SB 425HD
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post #10 of 16 Old 12-17-2017, 02:26 PM Thread Starter
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Quote:
Originally Posted by MeTo View Post
The low vacuum switch sense the level of vacuum for the brake booster and climate control. If the switch has failed, the light will light.
This box/connector?
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