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  #1  
Old 10-26-2005, 07:36 PM
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dash break light

ive done several searches for my question but havent found an answer. My red break light, next to the break sensor light on my dash will not shut off (yes the parking break is not on). it started last week while driving in rain. its on in the morning until my car is up to about 80c temp and will stay on for the rest of the day. i thought maybe something got wet because of the rain but its been doing the same thing during both wet and dry days. any ideas?

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  #2  
Old 10-26-2005, 09:27 PM
sixto's Avatar
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In some models that warning light is also used by the master cylinder fluid level sensor and the brake pad thickness sensors.

Sixto
87 300SDL
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  #3  
Old 10-26-2005, 10:11 PM
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thanks. i have an 82 300d turbo diesel.
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  #4  
Old 10-26-2005, 10:48 PM
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red light is fluid level in the master cylinder...the yellow is the pad sensors..in both the W116 and W123 models I have.
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1983 300D W123
1975 Ironhead Sportster chopper
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  #5  
Old 10-27-2005, 12:25 AM
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Check brake fluid level first.
If that's good, check to make sure that the return spring on the parking brake pedal is pulling it all the way up to engage the switch.
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  #6  
Old 10-27-2005, 01:23 AM
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Floppy parking brake pedal is by far the most common cause of this light staying on. It does on our 83, mine is firm and good though.
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  #7  
Old 10-27-2005, 04:44 PM
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the level seems fine. should i pump the resevoir pump? would that help?
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  #8  
Old 10-27-2005, 06:28 PM
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There are two separate reservoirs in the brake fluid container. Are you sure that both of them are full?

Len
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  #9  
Old 10-28-2005, 10:59 AM
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Both of mine are full. If there is a switch for the E brake, I'm gonna check that this weekend. Mine still stops fine, just has this annoying red light..

The only other thing I can think of is when I was replacing the air cleaner mounts, I leaned on the m/c (not on purpose), maybe I bent a prong on the connector?
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  #10  
Old 10-31-2005, 01:15 PM
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yep, both of my resevoirs are full. i pumped it a few times to see what would happend and it did nothing. the break light is still on. actually all 3 of my lights stay on when i start the car up (battery, sensor and parking break) and the battery and sensor turn off when i put the car in drive but if i let it idle they stay on. i dont remember if that did that before when i started the car or if that just started recently.
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  #11  
Old 10-31-2005, 01:18 PM
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Sounds like an electrical issue a brewin'. Alternator/regulator....or possibly a grounding issue.
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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 83k - mine - (OC-85,500)
'17 Metris(VITO!) - 13k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 51k - dad's (OC-52,000)
'16 E400 4matic Sedan - 57k - Brothers (OC-64,000)
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  #12  
Old 10-31-2005, 01:25 PM
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Quote:
Originally Posted by pawoSD
Sounds like an electrical issue a brewin'. Alternator/regulator....or possibly a grounding issue.

any ideas on how to check it? i thought those lights werent supposed to stay on that long. like i said this started during heavy rain...maybe something got wet?
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  #13  
Old 10-31-2005, 05:34 PM
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ok i did some research on the altenator and how to check it and everything came back ok. the battery read 12v off and 13.5v w the engine at 1500rpm. i cleaned and checked my battery connections and they appeared to be fine.

i double checked the haines manual and it said the light comes on to indicate the reservior tank pumps are in working order....when pumped. so i pumped it a few times and i managed to get the light to go out for a little bit but within 2 minutes it was back on.
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  #14  
Old 10-31-2005, 08:08 PM
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Quote:
Originally Posted by BernieBenz
ok i did some research on the altenator and how to check it and everything came back ok. the battery read 12v off and 13.5v w the engine at 1500rpm. i cleaned and checked my battery connections and they appeared to be fine.

i double checked the haines manual and it said the light comes on to indicate the reservior tank pumps are in working order....when pumped. so i pumped it a few times and i managed to get the light to go out for a little bit but within 2 minutes it was back on.
Light should NOT be on normally contrary to what you said the Haynes manual says. That manual has been known to be inacurate.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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