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#1 |
Junior Member
Join Date: Apr 2006
Location: San Diego
Posts: 100
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Brake light always on
Hello all,
My brake light on my 70 3/4 ton stays on all the time. This is a sudden incident. I can't find a wire going to the emergency brake to activate a light. Is their a switch down there? Any suggetions on what's causing to stay on all the sudden? I really appreciate your help. Thx. MM |
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#2 |
Retired Air Force Veteran
![]() Join Date: Aug 2007
Location: Pembroke Pines, Florida 33024
Posts: 1,808
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Re: Brake light always on
Don't have an answer but here's ttt for you. Maybe someone will see it before it fall off the 1st page. Good Luck
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Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop ![]() Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors |
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#3 |
MOVE OVER
Join Date: Jun 2002
Location: Warrensburg, MO
Posts: 5,470
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Re: Brake light always on
If I remember that light is not for the parking brake/ emergency brake. you may be loosing pressure in your brake system either front or rear, check your proporting valve I think that is where it connects.
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No matter where you are..... There you are... Buckaroo Banzi Last edited by rambler; 08-11-2008 at 03:04 PM. Reason: brain fart |
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#4 |
Retired Air Force Veteran
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Location: Pembroke Pines, Florida 33024
Posts: 1,808
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Re: Brake light always on
Unless he has swapped to front disks, he should not have a proportioning valve. He would only have a distribution block for the F/R drums, even for the 3/4 ton. Disk brakes became available in 71'. That's what I have always understood. Please correct me if I've given the wrong info.
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Harry 69' SWB Step Side 1/2 Ton w/68' Front Clip Swap from Leafs to Trailing Arms (Complete) Swap 6 Lug to 5 Lug (w/ Disk Brakes in Front) 3/6 Drop ![]() Help Support The Board Click Here For Information On How To Subscribe Krue's FAQ Page Vendors |
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#5 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Brake light always on
your low pressure sensor has tripped you are talking about the light int he dash not the rear brake lights right
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brake light always on
first thing to check is the fluid level in the master cyl second thing is to find the leak
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Brake light always on
While myoldchevytruck is technicly right, the info is still acurate.
The proportioning valve and distribution valve are both located in the same area, and both house the switch that is turning on the dash warning lamp. It is sensing a Difference in pressure between the front system and the rear system. Time to find the leak in your brake system. |
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#8 |
Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: Brake light always on
Are you talking about the brake lights on the back of your truck, or the "brake" light on the dash?
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Bill BEATERS ARE NEATER |
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#9 |
MOVE OVER
Join Date: Jun 2002
Location: Warrensburg, MO
Posts: 5,470
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Re: Brake light always on
so ol' rambler was correct, I just should have said.. check out the dohicky thing connected to the master cylinder!
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No matter where you are..... There you are... Buckaroo Banzi |
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#10 |
Junior Member
Join Date: Apr 2006
Location: San Diego
Posts: 100
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Re: Brake light always on
Thanks all, I was referring to the dash warning light. I will check the fluid and for leaks and see if that fixes it. Thx for the input. MM
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