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Old 09-03-2020, 12:01 PM   #1
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Default Now the Brake light is on!?

Brake light on the dash is on. I think it could be the button for the parking brake.
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Old 09-03-2020, 12:12 PM   #2
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That or low fluid.
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Old 09-03-2020, 12:24 PM   #3
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If the battery light and the brake light are both on it is an indication that the alternator is not charging.
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Old 09-03-2020, 01:13 PM   #4
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My own 1998 and 2004 Frontiers do not have a brake fluid indicator float/sensor.
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Old 09-17-2020, 03:17 PM   #5
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there is a wire going to the master cylinder and the fluid is full. besides that what else does this HB give the brake light for? ABS?
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Old 09-17-2020, 03:43 PM   #6
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ok im looking at EL-88 and it shows the battery light gets turned on from the Parking Brake, the Low Brake level switch, and the alternator. Where would these Diodes be? i just wonder if one is failed and thats whats giving me the light. Alternator checks out fine with 14.2 volts.


if the parking brake switch was messed up wouldnt it just stay in the "off" position? (depressed)


i checked the fluid level low switch and when i unplugged it nothing changed...


what am i missing?


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Old 09-17-2020, 03:46 PM   #7
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i have inspection due this month and im so happy this had to happen right at INSPECTION TIME!! UGH!! im pretty sure it wont pass with the light on.
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Old 09-18-2020, 01:42 AM   #8
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Do you have the wiring for a 97 still in your truck or is it from the ka24DE donor?
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Old 09-18-2020, 01:55 AM   #9
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Quote:
Originally Posted by SVTCTR View Post
ok im looking at EL-88 and it shows the battery light gets turned on from the Parking Brake, the Low Brake level switch, and the alternator. Where would these Diodes be? i just wonder if one is failed and thats whats giving me the light. Alternator checks out fine with 14.2 volts.


if the parking brake switch was messed up wouldnt it just stay in the "off" position? (depressed)


i checked the fluid level low switch and when i unplugged it nothing changed...


what am i missing?


Brian
It seems the park brake switch never fails in the convineient light off position.
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Old 09-18-2020, 02:00 AM   #10
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The reason that a bad alternator is the cause of the battery lamp and brake lamp illuminating is that the alternator is providing a ground for the bulb check relay. The alternator should not provide a ground while the truck is running, it should only provide a ground when the engine is off.

If the cause of the brake light were either the parking brake switch or the fluid level switch it would not cause the battery lamp to illuminate as well. The combination of the battery and brake lights illuminating together is what points to the alternator. It may just be one diode inside the alternator causing the issue, but the FSM doesn’t break down the regulator with a diagram.
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