81.25520.0171 F2000F3000X3000 brake light sensor

This is an important electronic part for SHACMAN F2000/F3000/X3000 heavy trucks. It's put where the brake pedal connects to the truck's hydraulic or pneumatic brake system, and it works as both a trigger and signal converter.When you step on the brake pedal, the sensor quickly catches the pedal moving. It turns that movement into an electrical signal, sends the signal to the truck's light control module, and the rear brake lights turn on or off right away. It's made tough for heavy trucks: the shell is strong, and the inside circuits won't get messed up. So it works well even in hot engine bays, dusty construction sites, or rainy and snowy roads.

Responds fast: Inside there's a precise spring and contacts, takes no more than 0.15 seconds to react. Step on the brake, lights come on right away-gives cars behind time to respond, fewer rear-ends.
Works anywhere: It has IP67 protection, better than the usual IP65. Keeps dust out, blocks water splashes, even handles short dips in water. Works from -40°C to 85°C, so it's good for cold northern winters and hot southern summers.
Lasts long: The shell's high-temperature ABS plastic, inside contacts are silver-nickel alloy-both don't wear easy and don't rust. Normally lasts 3-4 years (or 300,000-400,000 km), 30% longer than regular aftermarket sensors.
Easy to install: Uses the truck's original plug and mounting holes. No need to change wires or drill new holes. Mechanics can swap it in 5-10 minutes, saves time.
Stable signals: Inside has parts to stop interference. The truck's high-voltage parts (like generator or starter) won't mess up the signal-brake lights won't flicker or not turn on.

Fits which trucks: All SHACMAN Delong F2000/F3000/X3000 models. Including long-haul tractors, construction/mining dump trucks, heavy cargo trucks, and special ones like concrete mixers based on these series.
Where to use: It's a must-have safety part for the brake system. Used for daily road transport (highways, national roads), construction site work, and mining area transport. Makes sure brake signals reach cars behind clearly, and meets national safety standards (GB 7258-2017)

- Model: 81.25520.0171
- Applicable trucks: SHACMAN F2000/F3000/X3000 heavy trucks
- Voltage: DC 24V
- Current: ≤50mA
- Response time: ≤0.15 seconds
- Protection level: IP67
- Working temperature: -40°C to 85°C
- Service life: 3-4 years if used normally
- Plug type: Original 2-pin plug
- Shell material: High-temperature ABS plastic (stands engine heat and hits, hard to crack)
- Contact material: Silver-nickel alloy (doesn't wear out easy, doesn't rust-no bad contact, signals stay steady)

Q1: How do I know if this fits my SHACMAN X3000 dump truck?
A1: First check your original sensor's model-if it's 81.25520.0171, it fits.
Q2: What signs mean the sensor is broken?
A2: Three common signs:
Brake lights don't come on when you step on the pedal (sensor isn't sending signals);
Lights stay on after you let go of the pedal (sensor contacts are stuck, can't cut the signal);
Lights flicker when braking (signal is unstable-maybe contacts are worn or wires are loose).
Q3: Can I install it myself?
A3: If you can use basic tools, you can install it.
Turn off the truck's power (avoid short circuits);
Unplug the original sensor's wires;
Take the old sensor off the bracket (usually held by a nut or clip);
Put the new one on, plug the wires back.
Q4: How to make the sensor last longer?
A4: Two main things:
Don't let strong corrosive liquids (like engine coolant or battery electrolyte) splash on it-they'll corrode the shell and inside parts;
When maintaining the brake system (like changing the pedal or hydraulic oil), check the sensor's wires and plug. Make sure they're not loose or rusted, and wipe off dust or oil from the sensor sometimes.
Q5: If the sensor breaks, will it affect braking?
A5: No, it won't affect the brake itself. The sensor only controls the brake lights.
If it breaks, lights might not work or stay on-but the hydraulic/pneumatic brake still slows down or stops the truck normally.
But replace it right away. If brake lights don't work, cars behind can't tell you're braking-easy to have rear-end accidents.

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