Brake Warning Light Bezel + Wire & Spring | 67-77 Bronco, 67-76 Ford Truck SKU: 639700

Early Bronco Brake Warning Light Assembly | Bezel, Wiring, Spring & Bulb

Fits 1967-77 Ford Bronco | 1967-76 Ford F-Series Truck

Bring your factory brake warning system back to life with this complete Brake Warning Light Assembly for the 1967-77 Ford Bronco and 1967-76 Ford Truck. This kit includes the bezel, wiring pigtail, spring, and bulb needed to properly mount and wire the dash-mounted brake warning light.

Whether you’re restoring a classic Bronco or repairing a non-working warning light, this assembly provides the correct components to secure the light in the dash and connect it to your factory wiring.

Kit Includes

• Brake Warning Light Bezel – OE-style bezel designed to match the factory appearance and properly mount the warning light in the dash.

• Wiring Pigtail – Replacement pigtail that connects the warning light to the vehicle wiring harness.

• Mounting Spring – Holds the light assembly securely in the dash for a tight factory-style fit.

• Bulb Included – Replacement bulb ensures the warning light is ready to function once installed.

Factory Fit

• OE-Style Components – Designed to match the original parts for a clean, factory-style installation.

• Direct Replacement – Fits the factory dash opening and connects easily to the original wiring.

How the Brake Warning Light Circuit Works

The brake warning light in your 1967-77 Bronco or 1967-76 Ford truck is part of a simple but important safety circuit. The light is triggered when the brake system detects an imbalance in hydraulic pressure between the front and rear brake systems.

A brake pressure warning switch mounted on the proportioning valve or H-block monitors this pressure balance. If pressure drops on one side of the system—such as from a leak or component failure—the switch activates and grounds the circuit, illuminating the dash warning light.

This alert lets the driver know immediately that the braking system needs attention.

Completing the Circuit (Additional Parts You May Need)

To fully restore your brake warning system, you may also need the following components that complete the warning light circuit:

• Brake Pressure Warning Switch – This switch installs into the Proportioning Valve (disc brake systems) or H-Block Junction Valve (drum brake systems). The switch monitors hydraulic pressure inside the valve and triggers the warning light if a pressure imbalance occurs.

• Proportioning Valve Wiring Pigtail – Connects the brake pressure warning switch to the vehicle wiring harness.

The pigtail we offer uses a single-wire design. If your Bronco or truck originally used a two-wire warning light circuit, installation is simple: connect the single wire from the pigtail to the two wires that run to the dash warning light. This allows the switch to properly trigger the warning light just like the factory setup.

• Proportioning Valve (Disc Brake Systems) – Used on Broncos and trucks equipped with front disc brakes. This valve regulates brake pressure between the front and rear systems and houses the brake warning switch.

• H-Block Junction Valve (Drum Brake Systems) – Used on vehicles with four-wheel drum brakes. The H-block distributes brake fluid to the front and rear circuits and also accepts the brake warning switch.

Inside these valves is a pressure-sensing piston. If brake fluid pressure drops on either the front or rear system—such as from a fluid leak or line failure—the piston shifts and activates the brake pressure warning switch, illuminating the dash light.

When the light comes on, it indicates a loss of brake fluid or pressure in one half of the braking system, signaling that the issue should be diagnosed and repaired immediately.

Why the Brake Warning Light Matters

The brake warning light serves as an early alert if the hydraulic brake system loses pressure in either the front or rear circuits. When the system is functioning correctly, pressure remains balanced between both halves of the braking system.

If a leak, line failure, or component issue causes pressure to drop on one side, the warning light illuminates to notify the driver of a potential problem. This early warning helps prevent brake failure and gives you time to safely address the issue.

For a classic Bronco or vintage Ford truck, keeping this system operational is an important part of maintaining both safety and factory functionality.