What are these wires for?

[Soylent]

Starting to look into wires that go nowhere. These were conveniently tied up on the firewall. Currently the ends are twisted together.

 

[DirtDonk]

For the original brake warning lamp on the dash. Used to connect to the switch on the original H Block down on the frame.

 

[Soylent]

For the emergency brakes?

 

[Soylent]

Ok. Found explanation on Tom’s. I have the Moab system from WH so do I just leave the wires connected? What do most people do with hydra boost? Remove the wires and light. Use the dash hole fore something else?

 

[DirtDonk]

Do you have the original H-block still on the frame? Many of them MOAB systems are designed to connect the new booster and master down to the original H-block.
Got a picture of your frame down where the brake hoses attach?

 

[DirtDonk]

Is there still a connector on the end of those wires? Or is it just an ugly frayed and melted mess like it looks like in one of your pictures?

 

[Soylent]

Ugly twisted mess. No original block.

 

[ba123]

I think you’re not supposed to use it with the Moab systems I remember that in the instructions. Could be making that up but pretty sure.

Not sure why you need a light to tell you your brakes just lost pressure anyway. It’s like, oh, my foot just went to the floor, glad I can see that light!

 

[ba123]

It it does look like you might have a sensor at the end of your prop valve, which is where you would put one, but I didn’t and again, I think the instructions say not to.

 

[DirtDonk]

The sensors in the aftermarket proportioning valves like that, are simply an on/off pressure switch. For activating brake lights in a hot rod when your standard pedal does not have a brake light switch.
I would still keep the dash mounted light and repurpose it to a parking brake-on light.

The reason for the original pressure differential switch is so that you don’t have to wait for the pedal to go to the floor. You may have a slight loss of pressure from a very small leak, and then you have the chance to catch it before it turns big.
That’s what happened in my case when my original rear hose started seeping.

 

[m_m70]

The reason for the original pressure differential switch is so that you don’t have to wait for the pedal to go to the floor. You may have a slight loss of pressure from a very small leak, and then you have the chance to catch it before it turns big.

This^^

 

[DirtDonk]

To be clear, the pressure differential switches in the regular proportioning valves are still meant to activate the light on the dash. It’s just that the style in your installation is just a brake light switch.

 

[Steve83]

Always ID wires by color. Those are circuits 977 & 977A in zone G10.