When upgrading a classic Mopar or GM full-size car, a b-body disc brake conversion offers improved stopping power and modern braking feel. This guide highlights five compatible kits and parts that suit different project goals—whether you’re restoring a Mopar B-Body, a GM B-Body, or a Chevrolet 1955–58 full-size. Each option is evaluated for fit, install ease, and best-use scenarios so you can pick the right kit for your build. The following table provides a quick reference to the selected products and their best-use contexts.
| Product | Best For | Fitment Notes |
|---|---|---|
| Speedway Motors Front Disc Brake Conversion Kit (Mopar B-/E-Body) | Mopar B-Body 1962–1972, E-Body 1970–1974 | Bolt-on, factory mounting points |
| Inline Tube 1967–68 Chevrolet Full Size B-Body Front Disc Kit | Chevrolet full-size B-Body delanteros | Front discs, rear drums optional |
| Speedway Motors Manual Disc Brake Conversion Kit (Mopar B-/E-Body) | Mopar B-/E-Body restoration with manual brakes | OEM-style 11″ rotors |
| JEGS 8-3/4″ Rear End Disc Brake Conversion Kit | Mopar A/B/E Body with 8-3/4″ rear | Rear-disc conversion |
| Inline Tube 1955–58 Chevrolet Full Size Front Disc Kit | GM full-size 1955–58 | Stock-height disc conversion |
Note: Each product below is presented with the key features, fitment notes, and a practical buyer-focused takeaway. This helps you compare options quickly and choose the kit that best matches your project goals and mechanical comfort level.
Speedway Motors Front Disc Brake Conversion Kit for Mopar B-/E-Body
Features: Complete front upgrade with rotors, calipers, spindles, brackets, pads, bearings, seals, hoses, dust caps, and mounting hardware for both front wheels. Specifically designed for Mopar 1962–1972 B-Body and 1970–1974 E-Body models, including Charger, Road Runner, GTX, Barracuda, and Challenger. Bolt-on installation requires no machining or modification.
Best for: Mopar owners restoring or upgrading B-Body and E-Body cars who want a simple, direct bolt-on upgrade that preserves factory appearance. This kit is ideal for enthusiasts seeking a complete, ready-to-install solution without fabricating mounting points.
Caution: Some users may need to re-check compatibility with non-stock wheels or adapters to ensure full clearance at the wheel wells.
Inline Tube 1967–68 Chevrolet Full Size B-Body Front Disc Kit
Features: Upper and lower front disc conversion kit with disc in front and drums in rear; booster is stock 9″, cylinder is for disc/drum configuration. Inline Tube specializes in GM full-size applications for a period-correct upgrade that preserves stock structural mounting points.
Best for: Chevrolet full-size B-Body owners who want a balanced disc brake setup that remains close to original geometry while delivering improved stopping power. This option pairs well with stock-style components and straightforward installation.
Caution: Depending on your rear axle setup, you may still need compatible rear brakes to match the new front system and achieve balanced braking performance.
Speedway Motors Manual Disc Brake Conversion Kit for Mopar B-/E-Body
Features: OEM-style restoration kit with 11-inch cast iron rotors, loaded single-piston slider calipers, stock-height spindles, hubs, backing plates, rubber flex lines, bearings, seals, and hardware. Designed for 1962–72 Mopar B-body and 1970–74 E-body models for a factory-like appearance with modern braking.
Best for: Buyers pursuing a period-correct look while upgrading to disc brakes and ensuring the installation mirrors factory components. This kit is a suitable choice for purists who want an authentic appearance but enhanced performance.
Caution: The manual master cylinder compatibility is specific to certain Mopar configurations; verify your engine and brake booster setup before purchasing.
JEGS 8-3/4″ Rear End Disc Brake Conversion Kit
Features: Rear-end conversion kit designed for Mopar 8-3/4″ rear ends across A, B, and E body applications, with included disc/drum components to enable a full-disc conversion for the rear axle.
Best for: Builds that require comprehensive braking upgrades with a focus on rear-axle performance, such as highway cruisers or performance-oriented Mopars looking for balanced braking dynamics.
Caution: This kit is rear-focused; ensure the front brakes are upgraded accordingly to maintain overall braking balance and handling characteristics.
Inline Tube 1955–58 Chevrolet Full Size Front Disc Kit
Features: GM full-size front disc conversion with stock-height rotors, loaded GM calipers, rubber lines, and all hardware, seals, and bearings needed for a complete swap. The kit emphasizes ease of installation without spindle changes.
Best for: GM enthusiasts upgrading late-5th-to-mid-20th-century frames who want a straightforward, stock-appearing disc upgrade that preserves ride height and wheel alignment.
Caution: Older chassis geometry may require precise alignment checks; verify wheel clearance and rotor offset for your specific car model.
Buying Guide: Key Considerations For Disc Brake Conversions
What am I upgrading for?
Determine whether you prioritize improved stopping power, period-correct appearance, or a bolt-on installation with minimal modifications. This choice guides whether you select OEM-style parts or modern performance components.
What fitment do I need?
Verify the vehicle year, model, and axle type. Mopar B-/E-Body kits often assume stock spindles and hubs, while GM full-size kits require matching rotor diameter and caliper mounting patterns. If you have aftermarket wheels, check clearance with rotors and calipers.
Should I choose front-only or full system?
Front-disc upgrades deliver the most noticeable braking improvement. Rear-end kits or complete front/rear sets provide balanced braking, which helps stability under heavy deceleration and during cornering.
Do I need a new master cylinder or booster?
Some kits include or assume a compatible master cylinder. If your current system uses drums or an older booster, you may need a corresponding compatible unit to optimize pedal feel and braking performance.
Are there any compatibility caveats?
Period-looking components may limit modern performance in extreme conditions. If you plan aggressive driving or racing, consider kits explicitly designed for increased heat tolerance and higher clamping force, while ensuring street-legal compliance.
Maintenance considerations
Disc brake systems require brake fluid checks, rotor wear monitoring, and pad replacement intervals. Ensure you have access to the correct pad shapes and rotor sizes for your kit to simplify ongoing maintenance.
What type of user are these best for?
Best-for-Mopar restorations: front-disc kits with OEM-style appearance and bolt-on fit. Best-for-GM builds: front-disc and rear-disc options that preserve stock geometry. DIY enthusiasts: kits with comprehensive hardware and clear installation guidance. Purists: restoration-style kits that mimic factory-era components.
Common questions
- Can I install these without professional help? Most bolt-on kits are designed for DIY installation, but complex front and rear conversions may benefit from a mechanic’s guidance.
- Will these affect vehicle height or wheel alignment? In most cases, stock-height spindles maintain ride height, but verify alignment after conversion.
- Do these kits require aftermarket wheels? Some combinations may require wheel and caliper clearance checks, especially with larger rotors.
- Are rotors, calipers, and hoses included? Most complete kits include rotors, calipers, hoses, and mounting hardware, but verify per product listing.
- Will I need concrete modifications? Bolt-on kits minimize fabrication, but some models may require light trimming or mounting-point checks.
Frequently Asked Questions
- Q: Are these disc brake kits compatible with stock drum spindles? A: Many kits are designed for stock spindles, but verify for your specific year and model.
- Q: Do I need new brake lines? A: Most kits include rubber lines; some configurations may require longer hoses for proper routing.
- Q: Will these improve braking for daily driving? A: Yes, disc brakes offer improved stopping power and fade resistance over drum systems in everyday use.
- Q: Can I mix and match components from different brands? A: Mixing is possible only if mounting points and rotor/caliper dimensions align; otherwise, compatibility issues may arise.
- Q: Do these kits require wheel alignment after installation? A: A check and possible alignment is recommended to ensure optimal braking performance and tire wear.