how to compress drum brake cylinder

How to Compress a Drum Brake Cylinder A Step-by-Step Guide

When it comes to maintaining your vehicle’s braking system, understanding the intricacies of drum brakes is essential. Drum brakes, although somewhat less commonly used in modern vehicles compared to disc brakes, are still prevalent in many cars and trucks. One critical aspect of drum brakes is the brake cylinder, which plays a crucial role in the braking process. Compressing the drum brake cylinder is an essential procedure, particularly when replacing brake shoes or carrying out maintenance. This article will guide you step-by-step through the process of compressing a drum brake cylinder.

Tools and Equipment Needed

Before starting this process, gather the necessary tools and equipment 1. Jack and Jack Stands To lift the vehicle safely. 2. Lug Wrench For removing the wheel. 3. Brake Tool A drum brake tool or a cylinder compressor can be highly beneficial. 4. Pliers For handling springs and adjusters. 5. Brake Cleaner To clean components. 6. Gloves and Safety Glasses For personal protection.

Step 1 Safety First

Always prioritize safety when working on your vehicle. Make sure the car is parked on a flat surface. Engage the parking brake to prevent any movement. Wear gloves and safety glasses to protect yourself from debris and sharp edges.

Step 2 Lift the Vehicle

Use a jack to lift the vehicle. Ensure you place the jack under the manufacturer-recommended lifting points. Once lifted, secure the vehicle by placing jack stands beneath the chassis. This will provide stability and prevent any accidents while you work.

Step 3 Remove the Wheel

After securing the vehicle, use a lug wrench to remove the wheel. This will give you access to the drum brake assembly. Set the wheel aside in a safe place.

Step 4 Inspect the Brake Drum

Before compressing the brake cylinder, inspect the brake drum for wear and damage. If the drum is warped or excessively worn, consider replacing it. Cleaning any grime or brake dust with brake cleaner is also advisable to ensure a clean work environment.

Locate the brake cylinder and assess its condition. If you are replacing the brake shoes, you will need to compress the cylinder so that the new shoes can fit correctly.

Step 6 Compress the Brake Cylinder

To compress the drum brake cylinder, use a brake tool or a cylinder compressor. Position the tool inside the drum and carefully turn the handle to apply gradual pressure on the cylinder. This process will push the pistons back, allowing more space for the new brake shoes. Always compress the cylinder evenly to avoid damaging the assembly.

Step 7 Replace Brake Shoes

Once the cylinder is compressed, remove the old brake shoes. Pay attention to how the shoes and accompanying springs are positioned, as this will aid in installing the new shoes correctly. Install the new brake shoes, ensuring they are aligned properly.

Step 8 Release the Cylinder Pressure

After installing the new shoes, carefully release the pressure on the brake cylinder by reversing the action of the compressor or brake tool. This will allow the cylinder to return to its original position.

Step 9 Reassemble the Drum Brake

Reassemble any components you removed earlier, including the brake drums. Make sure to tighten all bolts and components securely.

Step 10 Reinstall the Wheel and Lower the Vehicle

After everything is reassembled, reinstall the wheel and hand-tighten the lug nuts. Lower the vehicle carefully using the jack, and once on the ground, fully tighten the lug nuts in a star pattern to ensure even distribution.

Conclusion

Compressing a drum brake cylinder is a vital skill for any vehicle owner or enthusiast. This process not only allows for the replacement of brake shoes but also aids in maintaining the overall braking system of your vehicle. Regular maintenance of your drum brakes ensures safety and performance, keeping you and your passengers secure on the road. Always remember, if you are unsure about any steps in the process, seek professional assistance to guarantee that your brake system is functioning correctly.