3rd line coming out of master cylinder?

[bucket]

I did not make a serious attempt to find out if connecting hydraulic lines to your master cylinder is still “legal”. However, in some states you may have trouble during an inspection if they notice it. It just depends on the inspector. However, there are definitely now newer and better designs to sense vehicle braking and send a signal to the trailer brakes.

I was also too fast in wording my answer about the brake controller wiring to the 7 pin plug. The brake circuit activates the trailer brakes, and “may” ( or maybe not) also be used charge a battery for the break-away system.

"It depends on the inspector"

Yessir, you are 100% correct. There are inspectors (at least one anyway) that don't know exactly what they are talking about and will fail a vehicle for something it should not legally be failed for. California included.

 

[Radiohead]

Just curious. Does it terminate to a controller or does it dead head somewhere?

FWIW, I was wondering what was going on with the OP's truck. I knew what they were for. Lol

 

[bucket]

Some states may have different laws for trailers. In Pennsylvania every heavy trailer wheel set are required to have brakes. Some states may only require one axle, not both.

When the forum members are talking about fuel injection and other items I don't know enough about, I keep quiet. When wrong info is posted about safety items, I'm ready for the Sh!t Show!

What is the weight rating at which brakes are required on all axles?

 

[Turbo4whl]

What is the weight rating at which brakes are required on all axles?

Here in Pennsyltucky, any trailer over 3000 lbs needs brakes and a brake-a-way system. All wheels need brakes. Years ago trailer brakes were only required if the trailer weighed more than half the towing vehicle weight. This led to confusion and misinterpretation.

Trailers over 3000 lbs need a safety inspection, unless it is a tool (implement of husbandry).

 

[Craig Nedrow]

IF you want to use an electronic brake controller, here is step by step on my 85 installing a RedArc controller and part #. Starts with post 152

https://www.gmsquarebody.com/threads/new-for-me-1985-silverado-20-6-2-diesel.32359/page-11

I have been using this controller to haul gravel behing the 85, and attest it works great, and easy to adjust.

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