When upgrading a G-Body with big brake capability, choose kits that balance stopping power, compatibility, and installation ease. This guide highlights five strong options for 1978-1988 GM G-Body platforms, helping you match each kit to your goals—street performance, classic restoration with improved braking, or a high-performance daily driver. The buyer’s table below summarizes key aspects to compare quickly.
| Product | Best For | Main Benefit | Limitations |
|---|---|---|---|
| Wilwood Front Brake Kit 80-87 GM G-Body 6 Piston Caliper | Performance-oriented drivers | High clamping force with six-piston calipers | May require compatible rotors and hardware |
| Inline Tube Compatible with 1978-87 GM G-Body Rear Disc Brake Conversion | Complete rear conversion | Cross drilled and slotted rotors included | Specific year range; rear-only kit |
| Fizzvex Rear Disc Brake Conversion Kit for G Body | Budget-friendly upgrade | Drilled rotors with broad compatibility across models | Rear-only solution; may need additional hardware |
| Inline Tube Front Brake Line Kit for 1978-88 GM G-Body | Fill-in lines and reliability | Stainless steel lines with factory bends for tight fit | Line-only upgrade; not a rotor/caliper kit |
| JEGS 631476 GM 10-Bolt Rear Disc Brake Conversion Kit | Rear disc upgrade for classic rear | Premium rear conversion with included components | Rear-specific; may need front upgrade separately |
Wilwood Front Brake Kit 80-87 GM G-Body 6 Piston Caliper
The Wilwood kit delivers a six-piston front caliper setup designed for 1980–1987 GM G-Body vehicles. It targets high-performance braking with stronger clamping and rotor engagement. Best for drivers seeking improved fade resistance and shorter stopping distances on street/strip applications. Choose this if you want a direct performance upgrade without extensive rotor changes. A potential limitation is the need for matching rotors and hardware compatible with the six-piston design.
Inline Tube Rear Disc Brake Conversion Kit (Cross Drilled & Slotted Rotors)
This Inline Tube kit provides a complete rear disc brake conversion for 1978–1987 GM G-Body cars, including cross drilled and slotted rotors, calipers, cables, lines, hoses, and hardware. It’s best for owners seeking a full rear upgrade to improve braking balance without replacing front brakes. Limitations include its rear-only scope, meaning front brakes must be upgraded separately for a full setup.
Fizzvex Rear Disc Brake Conversion Kit for G Body (Drilled Rotors)
The Fizzvex rear kit targets a broad 1978–1988 G-Body range, providing drilled rotors and a rear-only brake conversion. It’s a practical choice for those wanting a cost-conscious upgrade with improved rear braking, which can help reduce bias and improve stability in deceleration. Best for modestly enhanced rear performance; may require front-end adjustments for balanced braking.
Inline Tube Front Brake Line Kit for 1978-88 GM G-Body (Stainless)
This Inline Tube line kit provides stainless steel front brake lines with factory-accurate bends and fittings for 1978–1988 GM G-Body vehicles. It’s best for increasing line durability and reliability while preserving original routing. Choose this if you’re rebuilding lines during a larger brake upgrade or restoring a vehicle where line integrity matters. Caution: it is line-only and does not include rotors or calipers.
JEGS 631476 GM 10-Bolt Rear Disc Brake Conversion Kit
The JEGS rear disc brake kit is designed for 1978–1988 GM G-Body and 10-bolt rear setups, offering a premium conversion with included components. It’s best for owners who want a comprehensive rear upgrade with reliable parts from a recognized performance brand. A potential limitation is that this is a rear-focused kit; front brakes should be addressed separately to achieve full braking balance.
Buying Guide: Key Considerations for G-Body Big Brake Upgrades
- Scope of upgrade: Are you upgrading front, rear, or both? Some kits are rear-only, while others target front brakes for maximum performance.
- Vehicle compatibility: Confirm year range and axle type (G-Body, 10-bolt rear, etc.) to ensure proper fitment.
- Brake balance: Balanced upgrades between front and rear typically yield the best street performance and reduced nose-dive during hard braking.
- Rotor and caliper compatibility: Some kits require matching rotors, brackets, and hardware. Verify compatibility before purchase.
- Drilled/slotted rotors: While they improve feel and cooling, drilled rotors can be more prone to cracking under extreme abuse; consider driving style and climate.
- Brake line quality: Stainless steel lines offer durability and improved pedal feel; assess whether line upgrades are included or needed separately.
- Installation complexity: Some kits are straightforward upgrades; others may require substantial disassembly or specialized tools.
FAQ
- What is the benefit of a six-piston front caliper kit for G-Bodies?
Six-piston front calipers increase clamping force and pedal feel, helping reduce fade and improve initial bite on larger rotors.
- Should I upgrade both front and rear brakes at the same time?
For the best braking balance and predictable stopping, upgrading both ends is ideal, but rear-only upgrades can be a stepping stone if budget or parts availability are limited.
- Are drilled and slotted rotors essential for a street-driven G-Body?
They can improve cooling and bite under certain conditions, but they are not strictly essential. Consider your climate, driving style, and budget when deciding.
- Can these kits be installed with stock wheels?
Wheel compatibility depends on rotor diameter and caliper width. Some setups require wheel spacers or aftermarket wheels; confirm with your installer.
- Do these kits require professional installation?
Complex front-to-rear conversions and line replacements can benefit from professional installation to ensure proper alignment, bleeding, and safety.
- How do I verify fitment for my specific G-Body model?
Use the product’s listed year range and vehicle compatibility details, and consult the manufacturer’s fitment notes or Amazon Confirm Fit if available.