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post #1 of (permalink) Old 11-08-2001, 11:23 AM
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Brake Lights

A friend of mine has an 87 BroncoII 2 wheel drive.One day his brake warning light and rear abs light came on.He checked the brakes and replaced everything shoes,wheel cylinders,springs,front calipers,pads you name it he replaced it.In about 30 day he started having brake problems again.The rear brakes were completly burned up.Now he has replaced everything again adding a new master cylinder.All seems well but after about 30 minutes of driving.The brake warning and ABS lights come on.Any brake specialist out there that can figure this out.I thought brakes were brakes.Oh and the e-brake is not draging.
Any Ideas

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post #2 of (permalink) Old 11-08-2001, 06:34 PM
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Re: Brake Lights

Nothing comes to mind but-- one on the gas one on the brake. Seriously though , sounds pretty uncommon never heard of it. BTW- the parts ain't from the ZONE are they.

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post #3 of (permalink) Old 11-08-2001, 06:41 PM
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Re: Brake Lights

Um I have the same problem. I diagnosed it awhile ago and by the tests I did, it was either the ABS computer was fried or the excitor ring in the differential was out of wack. I still haven't got around to fixing it. Been driving years with the light on and no problems that I can see. In my case I'm almost positive it is the computer. Good luck, your gonna need it.

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post #4 of (permalink) Old 11-08-2001, 07:22 PM
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Re: Brake Lights

I'm not sure what kind of set up the bronco 2 has but i had the same problem on my 90 Bronco.Turns out the antilock valve(on the drivers side under truck inline between the master cylinder and the rear brakes)went out.Anytime a component in the antilock system goes out both lights will stay on.


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post #5 of (permalink) Old 11-08-2001, 07:57 PM
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That computer has a diagnostic mode, much like the EEC-IV - it can be triggered to flash out codes. Haynes has the procedure, but I've never read thru it since I'll never have RABS.

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post #6 of (permalink) Old 11-09-2001, 08:24 AM
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Re: Brake Lights

Is your buddy adjusting the drums too tight? A constant drag on the friction material will eventually delaminate, or fracture it, due to the thermal stresses (too high temp, or thermal cycling more than the engineered duty cycle).
The ABS is for the rears. I believe that Ford only offered rear ABS (RABS) until the early-mid 90's. I agree with the other posts about the excitor ring, or the sensor itself being on the fritz. As is my usual recommendation...a custom fit piece of polymeric anti-luminescent patch placed over the light on the dash will make the problem go away.

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