740 brake warning lighgt

"James Sweet" wrote in message

>
> "Jim Corey" wrote in message
>
>> Replaced the pads, turned the rotors and replaced the RF caliper on my 86
>> 740. The brake warning light sometimes glows faintly. Comes on full at
>> start. The faint glow goes away, and then returns. No discernable
>> pattern. Any thoughts?
>>
>
> Probably some crud lodged in the brake failure sensor, it's not too hard
> to take the plunger out and clean it up, but you'll have to bleed the
> brakes afterward.
>
>
I don't see an alternative. In the past I've tried to just re-center the
plunger but if the shuttle doesn't move freely there is no hope. Aren't
there o-rings to replace in the sensor? My memory is vague.

Mike
 >> Stay informed about: 740 brake warning lighgt 

"Michael Pardee" wrote in message

> "James Sweet" wrote in message
>
>>
>> "Jim Corey" wrote in message
>>
>>> Replaced the pads, turned the rotors and replaced the RF caliper on my
>>> 86 740. The brake warning light sometimes glows faintly. Comes on full
>>> at start. The faint glow goes away, and then returns. No discernable
>>> pattern. Any thoughts?
>>>
>>
>> Probably some crud lodged in the brake failure sensor, it's not too hard
>> to take the plunger out and clean it up, but you'll have to bleed the
>> brakes afterward.
>>
>>
> I don't see an alternative. In the past I've tried to just re-center the
> plunger but if the shuttle doesn't move freely there is no hope. Aren't
> there o-rings to replace in the sensor? My memory is vague.
>
> Mike
>
>

Yeah there's O-rings in there, the plunger actually consists of about 5
pieces, but I've never had to replace them.
 >> Stay informed about: 740 brake warning lighgt 

"John Robertson" wrote in message

> Are the sensors clean not covered in metal filings are the same sensors
> tight and the leads to them not frayed through ?
> "Jim Corey" wrote in message
>
>> Replaced the pads, turned the rotors and replaced the RF caliper on my 86
>> 740. The brake warning light sometimes glows faintly. Comes on full at
>> start. The faint glow goes away, and then returns. No discernable
>> pattern. Any thoughts?
>>
>
>

I don't think this is the ABS light he's referring to but the Brake Failure
light. Some clarification would be good, but I don't believe '86 had ABS.
 >> Stay informed about: 740 brake warning lighgt 

Are the sensors clean not covered in metal filings are the same sensors
tight and the leads to them not frayed through ?
"Jim Corey" wrote in message

> Replaced the pads, turned the rotors and replaced the RF caliper on my 86
> 740. The brake warning light sometimes glows faintly. Comes on full at
> start. The faint glow goes away, and then returns. No discernable
> pattern. Any thoughts?
>
 >> Stay informed about: 740 brake warning lighgt 

Non ABS. I'll check the sensor. To save my looking it up, where in the
system is it?


"James Sweet" wrote in message

>
> "John Robertson" wrote in message
>
>> Are the sensors clean not covered in metal filings are the same sensors
>> tight and the leads to them not frayed through ?
>> "Jim Corey" wrote in message
>>
>>> Replaced the pads, turned the rotors and replaced the RF caliper on my
>>> 86 740. The brake warning light sometimes glows faintly. Comes on full
>>> at start. The faint glow goes away, and then returns. No discernable
>>> pattern. Any thoughts?
>>>
>>
>>
>
> I don't think this is the ABS light he's referring to but the Brake
> Failure light. Some clarification would be good, but I don't believe '86
> had ABS.
>
 >> Stay informed about: 740 brake warning lighgt 

"Jim Corey" wrote in message

> Non ABS. I'll check the sensor. To save my looking it up, where in the
> system is it?
>
>
>

Get under the car and you can't miss it. It's on the frame down below the
brake booster, it's a small metal block which has about 8 metal lines and a
wire going to it. There's a cap on either end and if you take those off you
can poke the plunger out.
 >> Stay informed about: 740 brake warning lighgt 

Thanks. As the 740 is the WIFE'S car, I gotta get the project done. She's
had it since t was new, about 400,000 miles ago (the odo quit at 323,000 3
years ago).

Jim


"James Sweet" wrote in message

>
> "Jim Corey" wrote in message
>
>> Non ABS. I'll check the sensor. To save my looking it up, where in the
>> system is it?
>>
>>
>>
>
> Get under the car and you can't miss it. It's on the frame down below the
> brake booster, it's a small metal block which has about 8 metal lines and
> a wire going to it. There's a cap on either end and if you take those off
> you can poke the plunger out.
>
 >> Stay informed about: 740 brake warning lighgt