Front vs. Rear Disc Brake Conversions: Which Should You Do First?
Sep 1st 2025
When upgrading classic cars or restomods, one of the most common questions enthusiasts ask is whether to start with front disc brake conversions or rear disc brake conversions. Understanding the differences, benefits, and installation considerations will help you maximize safety, performance, and value.
What This Guide Covers
- How front and rear disc brakes function
- Key pros and cons of converting each first
- Recommended strategies for restomod builds
- Tips for pairing brake conversions with suspension upgrades
How Front Disc Brakes Work
Front disc brakes handle the majority of braking force, typically 60–70%, because weight shifts forward when stopping. Upgrading your front brakes can dramatically improve stopping distance and vehicle control.
Benefits of Converting Front Brakes First
- Maximum stopping power: Front brakes do most of the work during braking.
- Improved safety: Essential if your restomod will be driven on streets or tracks.
- Compatibility with suspension upgrades: Works well with Mustang II suspension kits and other upgrades.
Considerations
- Front brake upgrades are more complex, involving calipers, rotors, and sometimes steering components.
- Slightly higher cost compared to a single rear upgrade, but offers the most immediate performance gain.
How Rear Disc Brakes Work
Rear brakes provide 30–40% of braking force but are critical for stability and balance. Many classics still run drum brakes, which are outdated and prone to fade under heavy use.
Benefits of Converting Rear Brakes First
- Lower initial cost: Rear conversions are generally less expensive than front kits.
- DIY-friendly: Many rear setups are simpler, making them ideal for beginner builders.
- Balanced upgrade: Helps maintain proportional braking if only upgrading one end initially.
Considerations
- Rear upgrades alone may not noticeably improve stopping power.
- If paired with stock front drums, braking performance can become unbalanced.
Which Should You Do First?
Most experts recommend starting with front disc brake conversions. Here’s why:
- Safety first: Front brakes handle the majority of braking force.
- Better performance: Noticeable improvements in braking distance and control.
- Future-proofing: Easier to add rear disc brakes later for a balanced system.
Some builders choose to upgrade both ends simultaneously, especially during full suspension upgrades or complete restomod builds. While costlier, this ensures maximum performance and balanced braking from day one.
Pro Tips for a Successful Disc Brake Conversion
- Check compatibility: Ensure your kit matches your car’s year, axle type, and suspension.
- Pair with suspension upgrades: Works best with Mustang II suspension kits or similar.
- Use quality components: Choose rotors, calipers, and pads based on your driving style (street, track, or show).
- Consider professional installation: Especially important for front disc conversions.
Conclusion
Deciding whether to upgrade front or rear brakes first depends on your budget, goals, and safety priorities. For most restomod enthusiasts:
- Front disc brake conversion → Maximum stopping power, improved safety, and smoother suspension integration.
- Rear disc brake conversion → Lower cost and easier DIY installation, but with less immediate performance impact.