HOWO A7 HOWO T7H HOWO T5G‌ Exhaust Brake Switch WG9925716001 Used For Sinotruk Howo Truck Spare Parts Engine Parts

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HOWO A7 HOWO T7H HOWO T5G‌ Exhaust brake switch WG9925716001

Function

1. When the driver presses the switch, it sends a signal to the vehicle's electronic control unit (ECU) or directly activates the solenoid valve, closing the butterfly valve in the exhaust pipe, thereby restricting engine exhaust flow. This creates back pressure, achieving an engine braking effect.
2. It is suitable for downhill driving, long slopes, or situations requiring deceleration, helping to reduce reliance on the main braking system and preventing brake overheating or failure.
3. In HOWO A7, T5G, and TX models, this switch is usually integrated into the instrument panel or near the steering wheel for easy operation. It supports manual on/off control and may be linked with automatic cruise control or ABS systems to ensure safe braking.

DETAILS

Advantages

1. High-efficiency braking: With a response time of less than 0.5 seconds, it quickly activates the exhaust brake, providing an additional 20-30% braking torque, especially suitable for safe control of heavy-duty trucks on mountain roads or highways.
2. High durability: With a lifespan of over 100,000 switching cycles and a vibration-resistant design (compliant with GB/T 2423 standard), it reduces the failure rate.
3. Energy-saving and environmentally friendly: Engine braking reduces brake pad wear, extending the brake system lifespan by 1.5-2 times, while also reducing noise and emissions (compliant with Euro IV/V standards).
4. Good compatibility: Directly compatible with HOWO series original parts without circuit modification; excellent waterproof performance, suitable for rainy, snowy, or muddy road conditions.

symptom

1. Exhaust brake completely inoperative: No response after pressing the switch, and the exhaust brake indicator light on the instrument panel does not illuminate or remains off.
There is no noticeable engine braking effect when going downhill, and the vehicle relies solely on the main brakes for deceleration.
The ECU may report a fault code (P1682: exhaust brake input fault).
2. Exhaust brake constantly engaged/unable to disengage: The brake is activated as soon as the switch is turned on, and the brake light remains on, even when the switch is released or the foot brake is lifted.
3. Intermittent failure or flickering: The switch is sometimes effective and sometimes ineffective, and there is a "clicking" sound when pressed, but it does not activate the brake.

Troubleshooting suggestions

1. Visual inspection: Remove the switch and check the casing for cracks, signs of water damage, and whether the plug is loose or corroded.

2. Multimeter test: With the switch in the off position, the resistance between the two terminals should be infinite. When pressed, the resistance should be close to 0Ω (conducting). Check the voltage from the plug to ground/power supply; there should normally be a 24V supply.

It is recommended to check the appearance of the switches and clean the plugs every 3-6 months.

If the switch is working correctly but the system still fails, check the solenoid valve and butterfly valve for sticking, carbon buildup, or oil contamination (common in high-mileage vehicles).

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