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<p>As I recall, all the sensors that work the warning light earth
the light circuit when there is a fault. These are on the two
reservoir caps, the brake discs, the front/rear fluid distribution
block near the servo, and the hand brake. The "hot" lead to the
lamp visits each of these in tun, although I dont know in what
order. You could try earthing each one manually with a bit of wire
to the chassis, and see if the lamp lights up. If it lights on
one or more, but not all, that should help you locate the
problem. If there is still no action, try with a voltmeter on the
positive lead to the sensors (with the ignition on). Should read
12 volts. If nothing, must be a fault in the supply to the entire
circuit. (Thought: is there a fuse for this brake warning light
circuit?)<br>
</p>
<p><br>
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<p>Cheers,</p>
<p><br>
</p>
<p>Bill D.<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 12-Jul.-2021 11:57 a.m., Lance La
Certe via Rovernet wrote:<br>
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I would appreciate some diagnostic help. '70 3500S NADA.
The warning light for brake fluid levels is not working. I've
checked the lightbulb on the dashboard and it is good. I've
lifted each of the two reservoir caps several inches to get the
high tech (LOL) corks to lower and no light. I tried jumping
the cap wires to close the circuit, and nothing. I've made sure
the emergency brake is not engaged </div>
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Any help would be appreciated. </div>
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<br>
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<div style="font-family: Arial, Helvetica, sans-serif; font-size:
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Lance</div>
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