Here are some possible causes:
* Brake Fluid Leak: This is a major concern. A leak means your brake system isn't building up the necessary hydraulic pressure to engage the brakes effectively. Look for puddles under the vehicle, especially near the wheels and brake lines.
* Master Cylinder Failure: The master cylinder is the heart of your braking system. If it's failing, it won't properly transfer pressure from the pedal to the wheel cylinders.
* Wheel Cylinder Failure (or Caliper on disc brakes): These components push the brake shoes (drum brakes) or pads (disc brakes) against the rotors or drums to create friction and slow the vehicle. A failure in one or more wheel cylinders/calipers would result in a loss of braking power.
* Brake Lines or Hoses: A rupture or significant leak in any of the brake lines or hoses would dramatically reduce braking ability.
* Brake Booster Failure: The booster helps you apply sufficient force to the brake pedal, especially when stopping quickly or from high speeds. A failed booster would require significantly more effort on the pedal, and still may not stop the van effectively.
* Low Brake Fluid: While a leak is more serious, simply low brake fluid will reduce braking effectiveness. Check the brake fluid reservoir – it should be full to the "MAX" line. (However, low fluid suggests a leak is the underlying cause.)
* Worn Brake Pads or Shoes: While extremely worn pads/shoes will reduce braking power, they wouldn't usually result in a complete failure to stop unless coupled with another issue.
Immediate Actions:
1. Do not drive the van. This is paramount. Driving with severely compromised brakes is incredibly dangerous.
2. Have the van towed to a qualified mechanic. Do not attempt to diagnose or repair this yourself unless you're a trained and experienced mechanic.
3. Describe the problem clearly to the mechanic. Specifically, say that the brakes fail to stop the vehicle.
The problem requires immediate professional attention. Ignoring it could lead to a serious accident.
