1. Vacuum Leak: If there's a vacuum leak between the brake booster and the engine intake manifold, it can affect the brake booster's ability to generate the necessary vacuum assist to help brake calipers squeeze brake pads against the disc or drum.
2. Faulty Brake Booster: The brake booster utilizes engine vacuum or hydraulic pressure to multiply the force applied by the brake pedal. If the brake booster is malfunctioning or damaged, it can cause a loss of vacuum/hydraulic pressure, resulting in reduced braking power.
3. Engine Issues: If the engine has a problem idling or if its RPMs are too low, it may not produce sufficient vacuum for the brake booster. This can lead to a reduction in braking power.
4. Transmission Problems: If the dump truck has an automatic transmission and it shifts gears suddenly when the brakes are applied, it could affect engine RPM and vacuum levels, indirectly impacting the braking system.
5. Air-in Brake Lines: If air enters the brake lines, it can compress when the brakes are applied, effectively reducing the pressure transmitted to the brake calipers or wheel cylinders. This situation will result in decreased braking power.
To pinpoint the exact cause of your dump truck choking down when braking, it's best to have a professional automotive technician diagnose the issue.
