Brake warning light is haunted
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Senior User
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Brake warning light is haunted
I was driving to the dump today and my brake warning light came on for a few minutes. My parking brake was off (since it doesn't work anyway 
) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking 
) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking
Postmaster
Joined: Feb 2003
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From: Kentucky
Originally Posted by Truckmano5
I was driving to the dump today and my brake warning light came on for a few minutes. My parking brake was off (since it doesn't work anyway ) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking
) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking 
Fleet Mechanic
Joined: Sep 2002
Posts: 1,769
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From: Gretna ,LA.
I think there is a proportioning valve under the truck with a switch that will light the light if it moves too far one way,[if my memory serves me correct].Man I am digging deep into my brain on that one.
Posting Guru
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From: lino lakes, mn
check the adjustment of your rear brakes probably way out of adjustmest causing a lot of wheel cyl travel sometimes enuff to cause a brake cyl to loose its seal thus looseing brake pressure then the springs will push it back together the brake waring light is not connected to the E-brake on this era truck only to the proportioning valve to sense loss of pressure in the brake system and if a failure occurs the proportioning valve is spring loaded to block the end that looses pressure
Fleet Mechanic
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From: Gretna ,LA.
Originally Posted by plowpusher
check the adjustment of your rear brakes probably way out of adjustmest causing a lot of wheel cyl travel sometimes enuff to cause a brake cyl to loose its seal thus looseing brake pressure then the springs will push it back together the brake waring light is not connected to the E-brake on this era truck only to the proportioning valve to sense loss of pressure in the brake system and if a failure occurs the proportioning valve is spring loaded to block the end that looses pressure
Postmaster
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It means you have a problem with your brake system and you need to stop driving the truck until you figure out what it is and fix it.
Possiblities include:
Low brake fluid (but where did it go?) which means a leak somewhere
Bad master cylinder
Bad rear brake cylinders
Leak somewhere (bad hose or steel line)
There is no connection between the emergency brake and the brake warning light.
Possiblities include:
Low brake fluid (but where did it go?) which means a leak somewhere
Bad master cylinder
Bad rear brake cylinders
Leak somewhere (bad hose or steel line)
There is no connection between the emergency brake and the brake warning light.
Thread Starter
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Senior User
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If a rear brake cylinder on the pass. side is bad and/or leaking, will this cause the front brake on the pass. side to drag?
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Postmaster
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It shouldn't. The reason there are two chambers in the master cylinder is to separate the front and rear brakes.
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Postmaster
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Originally Posted by Truckmano5
I was driving to the dump today and my brake warning light came on for a few minutes. My parking brake was off (since it doesn't work anyway ) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking
) so what could this mean? My passenger-side front brake has been dragging enough to put a pull on the steering and braking