Upgrading your vehicle's braking system is one of the most effective modifications for improving safety and driving dynamics. StopTech's Street Performance Big Brake Kits (ST-40, ST-60, etc.) strike a proven balance between track-capable performance and daily-driver civility. Whether you are preparing for lapping days or simply want more confidence on mountain roads, these kits offer measurable gains in stopping power, fade resistance, and pedal feel. This guide covers the engineering behind the kits, the real-world benefits, and a detailed installation walkthrough to help you get the most out of your upgrade.

Why Upgrade Your Brakes?

Factory braking systems are designed to meet cost targets and moderate driving demands. Under heavy use – repeated hard stops, towing, or track sessions – stock components quickly overheat, leading to brake fade, longer stopping distances, and uneven pad wear. A big brake kit addresses these weaknesses by increasing rotor size, using multi-piston calipers, and improving thermal management. The result is consistent, predictable deceleration at any speed.

Key Benefits of StopTech Street Performance Big Brake Kits

StopTech’s Street Performance line is engineered specifically for street-driven cars that see occasional track use. Here is a detailed breakdown of the advantages.

Enhanced Stopping Power

The larger diameter rotors and multi-piston calipers create a larger swept area, which translates directly into higher clamping force and shorter stopping distances. With four or six pistons applying even pressure across the rotor, pad wear is more uniform and the brake becomes more resistant to fade during repeated hard stops.

Superior Heat Management

StopTech uses curved internal cooling vanes that pump air through the rotor more efficiently than straight-vane designs. The cast-iron rotors are also drilled or slotted to release gas and wipe away pad debris. This thermal capacity keeps the system below fade temperature even during aggressive street driving or beginner-level track sessions.

Improved Pedal Feel and Modulation

Multi-piston calipers provide a firmer, more linear pedal. The stiffness reduces the “spongy” sensation common with sliding calipers, allowing the driver to modulate braking force precisely. This is especially valuable in trail-braking situations and emergency maneuvers.

Increased Durability

StopTech rotors are constructed from high-carbon G3500 cast iron for resistance to heat checking and warping. The calipers are anodized and corrosion-resistant. Stainless steel brake lines are included in many kits, further improving feel and longevity.

Direct Fitment

Each kit is vehicle-specific, using brackets and hardware that bolt directly to the factory steering knuckles. This eliminates the need for adapter plates or modifications to the hub. In most cases, the kit clears factory wheels with the appropriate offset, though wheel fitment verification is recommended before purchase.

Warranty and Support

StopTech backs its Street Performance kits with a limited warranty. Technical support is available via phone and online resources, including detailed installation manuals for each kit.

Understanding StopTech's Engineering

The Street Performance line features a fixed caliper design – meaning both inner and outer pads are forced toward the rotor by pistons on both sides. This contrasts with floating calipers, which rely on a sliding mechanism that can introduce hysteresis. StopTech uses a one-piece (monoblock) caliper body machined from billet aluminum for maximum rigidity. The piston bores are cross-drilled for cooling and the pistons themselves are stainless steel to resist corrosion and reduce heat transfer to the brake fluid. Rotors are either slotted (preferred for street) or drilled (more aggressive look, but prone to cracking under extreme track use). Pad compounds are optimized for street performance, offering quiet operation and low dust levels.

Installation Preparation

Installing a StopTech big brake kit is a rewarding DIY project for anyone with basic mechanical skills. Plan on 4–6 hours for the first-time installation. Before you begin, gather the following tools and supplies:

  • Socket set (metric and SAE, depending on vehicle)
  • Torque wrench (range 20–150 ft-lb)
  • Brake cleaner and rags
  • DOT 4 or DOT 5.1 brake fluid (never reuse old fluid)
  • Jack and jack stands (rated for vehicle weight)
  • Brake bleeder (motiv pressure bleeder or one-person bleeder)
  • Needle-nose pliers for clip removal
  • Thread-locking compound (Loctite 242 recommended)
  • Safety glasses and mechanic’s gloves

Read the StopTech installation manual specific to your kit before lifting the car. Verify that you have all components: rotors, calipers, brackets, hardware, brake lines, and pad anti-rattle clips. Pre-torque any fasteners to the manufacturer’s spec before final assembly.

Step-by-Step Installation Guide

1. Lift and Secure the Vehicle

Work on a level surface. Loosen the lug nuts while the car is on the ground, then jack up the vehicle and place jack stands under the factory lift points. Never rely on a jack alone for support.

2. Remove the Wheels

Set the wheels aside where they will not be scratched. If your vehicle has wheel covers or hubcaps, remove them carefully.

3. Remove Old Brake Components

Unbolt the caliper from the steering knuckle and suspend it with a zip tie or bungee cord to avoid stressing the brake hose. Remove the old rotor – it may be held in place by a small set screw or retaining clip. Keep existing hardware aside if you plan to reuse the wheel speed sensor or dust shield, but note that many big brake kits require trimming or removal of the dust shield for rotor clearance.

4. Prepare the Hub and Install New Rotors

Clean the hub mating surface with a wire brush or sandpaper to remove rust. Use a light coat of anti-seize on the hub face to prevent corrosion. Position the new StopTech rotor on the hub, aligning the directional vanes (inside vanes should face the vehicle’s forward direction). Tighten any retaining set screws to the specified torque – typically 12–15 ft-lb.

5. Mount the Caliper Bracket

Attach the aluminum caliper bracket to the knuckle using the supplied bolts. Apply a drop of thread locker and torque to spec – often 80–110 ft-lb depending on the vehicle. Do not reuse old bolts; always use the hardware included with the kit.

6. Install the Caliper and Pads

Insert the brake pads into the caliper, clipping on the anti-rattle hardware. Some pads require bedding compound, but StopTech pads are pre-burned. Slide the caliper over the rotor and attach it to the bracket. Tighten the caliper mounting bolts to the specified torque (usually 45–55 ft-lb). Ensure the caliper is centered and does not contact the rotor.

7. Connect Stainless Steel Brake Lines

Disconnect the factory rubber line from the hard line. Install the supplied stainless steel line, using new copper washers at the caliper banjo fitting. Torque the banjo bolt to spec (typically 17–20 ft-lb). Secure the line with clips to prevent chafing.

8. Bleed the Brake System

Start with the right rear (furthest from the master cylinder), then left rear, right front, left front. Use a pressure bleeder set to 10–15 psi for best results. Open each bleeder until clear fluid emerges with no bubbles. Top off the reservoir frequently. Use fresh DOT 4 fluid. Do not reuse fluid from an opened bottle.

9. Reinstall Wheels and Lower Vehicle

Torque the lug nuts to the vehicle manufacturer’s spec in a star pattern. Lower the car to the ground and retorque after setting the car’s weight. Pump the brake pedal a few times to seat the pads and build pressure.

10. Test and Bed-In

Before driving on public roads, test the brakes in a safe area. Perform several moderate stops from 30 mph to check pedal feel and noise. Follow the bedding procedure described in the next section.

Bedding-In Your New Brakes

Proper bedding (also called burnishing) transfers a layer of pad material to the rotor surface, maximizing friction and preventing premature glazing. StopTech recommends a specific sequence:

  • Drive to a clear stretch of road. Perform 8–10 moderate stops from 40 mph to 10 mph, applying firm pedal pressure without locking the wheels. Allow about 15 seconds of cool-down driving between each stop.
  • Follow with 2–3 hard stops from 55 mph to 15 mph to heat the rotors further. Again, cool down between stops.
  • Drive an additional 2 miles without using the brakes to let the rotors cool completely.
  • Park and leave the brakes untouched for at least one hour. Do not engage the parking brake while the rotors are hot.

A blue-gray tint on the rotor surface indicates successful bedding. Avoid racing or heavy braking for the first 200 miles to allow the pads to fully conform to the rotors.

Common Installation Mistakes to Avoid

  • Over-tightening fasteners: Use a torque wrench. Stripping caliper bracket threads can ruin the knuckle.
  • Forgetting to torque lug nuts after lowering: This can cause wheel vibration and rotor runout.
  • Using compressed air to clean the hub: This forces debris into wheel bearings. Use a brush and vacuum.
  • Neglecting to bleed all air from the system: A soft pedal after installation indicates trapped air. Re-bleed immediately.
  • Mixing pad compounds front and rear: Maintain the same brand and type on both axles for balanced bias.
  • Skipping the break-in process: Driving aggressively without bedding can cause uneven pad deposits and vibration.

Maintenance and Care

StopTech street pads produce low dust, but periodic cleaning of the rotors and calipers with brake cleaner prevents build-up. Inspect the rotor thickness and pad life every 5,000 miles. Replace the brake fluid at least every two years. If you track the car, install titanium pad shims to reduce heat transfer to the caliper piston seals. Stainless steel lines should be checked for abrasion during tire rotations.

For more detailed maintenance schedules, refer to the StopTech technical support page.

Final Considerations

Upgrading to StopTech Street Performance Big Brake Kits is a worthwhile investment that transforms how your car stops. The combination of larger rotors, multi-piston calipers, and high-quality pads delivers consistent performance in all conditions. By following this installation guide and bedding procedure, you will avoid common pitfalls and maximize the life of your components. Whether you are an autocross regular or simply want extra safety margin, these kits deliver tangible improvements.

Before ordering, verify wheel clearance and consult the StopTech Street Performance product page for fitment details. For additional installation resources, check out Tire Rack's brake bleeding guide and Zeckhausen's bedding-in instructions.