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Old 04-10-2021, 09:18 PM   #1
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Active Break Relay Clicking All of a Sudden

Would love your help with a clicking Active Break Relay that just started in our 2009 Chevy Collins.

Every time we press and release the break pedal the clicking happens. We hear it happening in the front electrical panel in the "Active Break Relay" box.

Any ideas on what this means? It has never happened before ó*and started mid drive today.

Thanks in advance!
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Old 04-10-2021, 09:24 PM   #2
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First think I would do is photograph and label the wires carefully, make sure the other relays work and then swap one for the other to rule out the relay.

Clicking indicates that the relay is either getting bad power, bad ground, or the brake pedal switch is janky, or that the relay is bad. Rule out the easier one first by swapping the relay.

Next is verify the grounds which should be near the relay, then measure the hot going into the coil of the relay when you press the brakes and see if itís a steady 12v.
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Old 04-11-2021, 09:09 AM   #3
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Just thinking more about this, if your bus is equipped with ABS it could be a whole nother issue. Does it happen when standing still or only when rolling? If only when rolling you could have an abs issue, first guess would be a wheel speed sensor.
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Old 04-11-2021, 11:30 AM   #4
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Thanks for the thoughts/ideas! It happens when it's still/at at stop too (even without the bus on).
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Old 04-11-2021, 01:33 PM   #5
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Quote:
Originally Posted by skye View Post
Thanks for the thoughts/ideas! It happens when it's still/at at stop too (even without the bus on).

Thatís actually probably a good sign. Look at the first post then, start with swapping the relay and see where that gets you.
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Old 04-11-2021, 01:39 PM   #6
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look into HYDROBOOST brakes.
there is alot going on with them including your power steering and brakes are interconnected.
who labled the relays?
but yes swapping them around is a good starting point.
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