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Old 06-13-2019, 07:52 AM   #1
Mikessprinter
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Default Why is my brake light on ?

Hi all. Seems I have a problem with my brake system . I have a 2008 sprinter without steering wheel controls. The Red brake light went on last week ,after which I checked the brake fluid , checked the ebrake. Changed the rear discs , checked the calipers to make sure they’re functioning, checked the bake pad sensors, checked the u joints on the driveshaft . Also had all the wheels balanced. And still it’s on. I have a generic scanner which I knew would tell me nothing . The vehicle brakes fine so it’s confusing. Also I don’t have a trailer or hitch. And there is no buzzer that sounds. The service manual seems to point to ebv system malfunction but I’m not sure what else to check. Any ideas would be much appreciated. Thanks gents.

Last edited by Mikessprinter; 06-13-2019 at 08:10 AM.
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Old 06-13-2019, 12:18 PM   #2
edfrompa
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Default Re: Why is my brake light on ?

Did you check the wear sensors on each wheel??
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Old 06-13-2019, 12:45 PM   #3
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Default Re: Why is my brake light on ?

When you say red brake light went on, you mean display message or rear lights stay on, did you check brake light switch? You need a better scanner.


Last edited by Bobnoxious; 06-13-2019 at 03:33 PM.
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Old 06-13-2019, 05:13 PM   #4
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Default Re: Why is my brake light on ?

In the T1N, the red "BRAKE" light on the instrument display has two meanings:
(1) Brake fluid level too low and
(2) electronic brake force distribution (EBD) malfunction

So you checked #1, but it may take a scanner to check #2

Check your owner's manual for the meaning of the displayed message.

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 06-13-2019, 05:26 PM   #5
The Grand Tour
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Default Re: Why is my brake light on ?

Quote:
Originally Posted by Mikessprinter View Post
The Red brake light went on last week ,after which I checked the brake fluid , checked the ebrake. Changed the rear discs , checked the calipers to make sure they’re functioning, checked the bake pad sensors, checked the u joints on the driveshaft . Also had all the wheels balanced. And still it’s on. I have a generic scanner which I knew would tell me nothing .

Any ideas would be much appreciated. Thanks gents.
Wheel balance and J-joints have nothing to do with the red brake warning light.

Why did you change the rear brake rotors?

Sounds like you should have a competent Sprinter technician diagnose and repair the Cause of your red brake warning light Concern before you drive it on public roadways shared with other motorists.
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Old 06-13-2019, 06:48 PM   #6
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Default Re: Why is my brake light on ?

Here's what the 2015 Owner's Manual has to say about the red BRAKE warning light:
(note: that it says to *not* add fluid!)

BRAKEwarning.png

--dick
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2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
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Old 06-15-2019, 11:29 PM   #7
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Default Re: Why is my brake light on ?

Quote:
Originally Posted by Mikessprinter View Post
Hi all. Seems I have a problem with my brake system . I have a 2008 sprinter without steering wheel controls. The Red brake light went on last week ,.........., checked the bake pad sensors...........
How did you check the brake wear sensors?
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Old 06-19-2019, 03:12 AM   #8
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Default Re: Why is my brake light on ?

The brake wear sensor light on an '08 is an amber dashed circle. The red light that says "Brake" comes on with low fluid, or what it thinks is low fluid. After checking all you did on my '08, I added fluid even though it was half way between Max and Min. It solved the problem.
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Old 09-01-2019, 03:36 PM   #9
Mikessprinter
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Default Re: Why is my brake light on ?

Well I’m all out off ideas. Other than swapping out the brake reservoir. Seems like the only thing that could cause the light other than a trailer is fluid. It’s always been at the full mark though. When I put it on the icarsoft it says the sensor is reading it low. Checked the wiring and all looks good. Is there any way to test the brake fluid reservoir sensor manually ? I’ve never heard of one of these crapping out so I’m still skeptical that it’s the sensor.
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Old 09-01-2019, 03:44 PM   #10
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Default Re: Why is my brake light on ?

Have you tried resetting the brake switch?

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