HOWO TRUCK PARTS SEM Spare Parts 5217527 Parking Brake Chamber W080400000 FROM SINOTRUK COMPANY

Shandong Shengyue Technology Development Co.,Ltd is one of the most professional howo truck parts sem spare parts 5217527 parking brake chamber w080400000 from sinotruk company manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.

Parking brake air chamber SEM650

Primarily used in wheeled loaders (such as Shantui/SEM 650B, 655D, 656D series), it is also compatible with the parking brake systems of some heavy-duty trucks or construction machinery (some Sinotruk HOWO derivative models or modified vehicles may use it interchangeably).

Function

1. It provides a parking brake (handbrake) function, automatically locking the brakes using spring force when there is no air pressure, preventing the vehicle from rolling after parking; when air pressure is supplied, the spring is released, disengaging the parking brake.
2. It integrates a spring brake chamber and a service brake chamber internally; during parking, the air pressure is released, and a powerful disc spring pushes the push rod outwards, causing the brake shoes/calipers to lock the wheels; when air is supplied (handbrake valve released), the air pressure compresses the spring, the push rod retracts, and the brake is released. The service brake chamber is linked to the foot brake air circuit to provide service braking.

3. It is connected to the parking brake lever valve (handbrake valve), dual-chamber brake air chamber (service chamber), brake shoe assembly, wheel-end reducer, air lines (M14/M16 interface), and air dryer/air reservoir; in SEM loaders, it is usually installed on the rear axle wheel end or the middle axle brake base plate, and is indirectly connected to the ABS/EBS system (providing a parking signal).
4. Parking brake failure poses a very high risk of vehicle rolling downhill, especially under heavy load, which may cause serious accidents; spring fatigue or air leakage will weaken the handbrake, preventing the vehicle from being reliably secured; service chamber failure affects the foot brake force, extending the braking distance; abnormal parking brake light or air pressure alarm on the instrument panel may occur.

DETAILS

Advantages

1. Accuracy/Response Speed: Spring release/compression response <0.3 seconds, stable parking brake locking force (deviation <5%); high consistency of push rod stroke ensures uniform braking.
2. Durability/Lifespan: Springs undergo multiple heat treatments, with a fatigue life of >1.5 million cycles; housing withstands impact >50g acceleration; overall service life of 5-8 years or 20,000-30,000 hours (engineering machinery standard).
3. Environmental Adaptability: IP65 dustproof and waterproof rating, resistant to mud, sand, and salt; oil and chemical corrosion resistant, suitable for harsh environments in mines and construction sites.

symptom

1. Insufficient or complete failure of the parking brake force, causing the vehicle to roll downhill;
2. Air chamber leakage, continuous decrease in system air pressure, rendering the handbrake ineffective.
3. Push rod sticking (difficulty extending/retracting)
4. Abnormal spring noise (breakage or fatigue)
5. Weak service brake in the service chamber (weak foot brake)
6. Corroded air pipe connector causing air leakage
7. Slight movement of the vehicle after parking.

Troubleshooting suggestions

1. Typical failure symptoms triggering replacement: Vehicle still rolls after the handbrake is applied, parking brake chamber leaks air (pressure gauge drops rapidly), push rod extends insufficiently/is stuck, abnormal noise (spring breakage sound), and abnormal parking brake indicator light.
2. Recommended preventive replacement mileage/time: Replace every 5000-8000 hours or 3-5 years; shorten to 3000 hours under high-intensity working conditions (such as continuous operation in mines); replace simultaneously when overhauling the wheel hub/axle housing.

3. Installation Precautions and Common Mistakes: The air pressure must be completely released to prevent the high-pressure spring from ejecting and causing injury; incorrect air line connection (connecting the parking brake chamber to the service brake line will cause malfunction); the push rod is not aligned with the brake arm, leading to jamming; preheat the air chamber during winter installation to prevent cold embrittlement; use original manufacturer's seals to prevent air leaks.
4. Verification Procedures After Replacement: Check for air leaks after inflation (air pressure should be maintained for 24 hours); test the parking brake to ensure the vehicle is locked (slope test); measure the push rod stroke (should be 50-65mm); road test: perform service braking and parking braking to confirm there are no abnormal noises or vehicle rolling.

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