Checking the emergency brake, often referred to as the parking brake, is a critical maintenance task that ensures your vehicle remains secure when parked and can serve as a vital safety backup during regular driving. This system, whether it is a traditional lever, a pedal, or a modern electronic button, relies on cables, drums, or discs that can wear over time due to cable stretch, corrosion, or general use. A failure in this system can lead to a stationary vehicle rolling away, making a simple check essential for every driver to perform regularly.
Understanding the Emergency Brake System
Before learning how to check emergency brake, it is important to understand the type of system your vehicle utilizes. Most modern cars feature a cable-operated system connected to the rear brake assemblies, while some performance or larger vehicles may use disc brakes integrated into the rear rotor design. Electronic systems, common in newer models, require diagnostic tools but still have mechanical components that need visual inspection. Knowing your setup helps you focus the inspection on the specific components that are relevant to your vehicle's design.
Initial Preparation and Safety
Safety is paramount when inspecting any part of the vehicle, and the emergency brake requires specific precautions to prevent injury or vehicle movement. You should always perform this check on a solid, level surface, and never rely on the brake alone to hold a car on an incline. Engage the regular service brake pedal fully before you begin any work, and if you need to lift the vehicle, ensure it is secured on jack stands. Wearing gloves is recommended to protect your hands from dirt and sharp cable edges during the inspection.
Visual Inspection of Cables and Components
A visual check is the first step in how to check emergency brake for wear and potential issues. Locate the brake cables under the vehicle, usually running from the transmission or rear axle to the brake mechanism on each rear wheel. Look for signs of rust, which can cause the cable to seize or snap, and check for any fraying or kinks in the steel strands. The cables should move freely without binding, and the sheathing should not be cracked or damaged, as this can allow moisture to corrode the inner wires.
Testing the Parking Brake Lever or Pedal
The mechanical operation of the handle or pedal provides immediate feedback on the health of the system. When you pull the emergency brake, it should require a firm, consistent amount of effort to engage fully. If the handle rises significantly or feels excessively loose before it engages, it indicates too much play in the cables or linkage. Conversely, if the pedal reaches the floor with little resistance or feels "spongy," it suggests air in the hydraulic lines or a failing master cylinder in the emergency circuit, which necessitates immediate attention.
Checking Brake Drum Clearance
For vehicles with drum brakes, checking the emergency brake involves measuring the clearance between the brake shoes and the drum. You can often access this by removing the wheel and looking through the inspection hole on the backing plate. When the emergency brake is applied, the shoes should press firmly against the drum's interior without excessive gap. If the gap is large or the shoes appear glazed or contaminated with oil, the braking force will be significantly reduced, requiring adjustment or component replacement.
Road Test and Functional Verification
After the visual and mechanical checks, a road test is essential to confirm the system works under real-world conditions. Find a safe, empty area and engage the emergency brake while moving at a slow speed, usually no more than 5 to 10 miles per hour. The vehicle should decelerate smoothly and come to a complete stop without pulling to one side. A test on a gentle incline is the ultimate verification; with the vehicle in gear and your foot on the service brake, you should be able to leave the gear in park or engage the emergency brake without the car rolling when you release the service brake.
