why won't my brake drum go back on

Why Won't My Brake Drum Go Back On?

If you're a car enthusiast or simply someone who likes to take care of your own vehicle, you may have encountered the frustration of trying to reinstall a brake drum only to find that it just won't go back on. This issue can deter even the most confident DIY mechanics, leading to questions about the causes and solutions. Here’s a comprehensive look into why your brake drum might be giving you a hard time and what you can do to resolve the situation.

Understanding the Brake Drum

The brake drum is a crucial component of your vehicle's braking system, particularly in drum brake systems. They house the brake shoes, which press against the interior of the drum to create the friction necessary for stopping. Over time and use, brake drum components can wear down or suffer from corrosion, making it challenging to reinstall them after maintenance.

Common Reasons for Brake Drum Reinstallation Issues

1. Brake Shoe Adjustment One of the most common reasons a brake drum won't fit is an improper adjustment of the brake shoes. When you take off the drum, the shoes can expand. If they aren’t adjusted back to their resting position, they can prevent the drum from sliding back on. Always ensure that the shoes are retracted properly when attempting to put the drum back in place.

2. Corrosion and Dirt Brake drums can accumulate grime, dirt, and rust over time. If you’ve been using your vehicle in a muddy or wet environment, there could be debris inside the drum or on the hub that needs to be cleaned off. Inspect both surfaces thoroughly; cleaning them can often resolve fitting issues.

3. Worn Components If your shoes, drum, or any related hardware have seen better days, their wear can prevent proper fitting. A drum that is too deeply scored or shoes that are excessively worn may not provide the right clearance. In such cases, you may need to replace these components to ensure a proper fit.

4. Human Error Sometimes, the issue is simply a matter of human error. Ensure that you are trying to reinstall the drum on the correct side of the vehicle. Additionally, make sure all retaining clips and springs are properly in place and not obstructing the drum from seating correctly.

5. Hydraulic Pressure In vehicles with hydraulic brakes, if the brake caliper or wheel cylinder has been compressed or not bled correctly, it could lead to more extension in the shoes. If the pressure has not been released, it may cause the shoes to remain expanded and hence prevent the drum from fitting on.

- Adjusting the Brake Shoes Before reinstalling, adjust the brake shoes back to their resting position. This often involves turning a star wheel or using a specific tool designed for this purpose.

- Cleaning Take some time to clean both the inside of the drum and the exterior hub. Removing any rust or debris can ensure a smooth fit. Use a wire brush and some brake cleaner to do this effectively.

- Inspection Examine all brake components for wear or damage. It’s sometimes prudent to replace old parts, particularly if you notice excessive wear or if the brake pads are thinning out.

- Seek Professional Help If after these adjustments and checks the drum still won’t fit, it might be worthwhile to consult a professional mechanic. They can provide insights and assistance that can save you time and effort.

Conclusion

In summary, a brake drum that won’t go back on can be a frustrating roadblock in your vehicle maintenance journey. By understanding the common reasons for this issue—from brake shoe adjustments to dirt and corrosion—you can better navigate the situation. With a bit of patience and care, you’ll soon have your brake system functioning smoothly again.