Brake Ducting

How Brake Ducting Cools Your Brakes

Brake ducting cools your brakes by pulling air from a high-pressure area at the front of the car and delivering it straight to the rotor. As you drive, air stacks up at the nose, bumper openings and headlight area. A duct inlet in that zone captures the air, and a hose carries it back to the wheel.

Where the air lands matters most. The best practice is to feed air into the center, or eye, of the rotor. On vented disc brakes, that air then flows outward through the internal vanes and pulls heat from the rotor core.

Air blown only at the rotor face cools the surface but does far less for the inside. The most common setup uses a spindle-mounted plate that points a 3" or 4" hose at the rotor eye. Your inlet, hose and outlet work as one system, so a restriction anywhere cuts airflow.

If you're upgrading to larger or vented brake rotors, plan your ducting at the same time.

Brake Duct Components: Hoses, Flanges and Spindle Ducts

A complete brake duct system has three parts: an inlet at the front of the car, a hose and an outlet at the spindle. You can buy each piece separately and build a setup that fits your chassis. Allstar Performance covers the core hardware racers use.

Here's what each Allstar part does and where it fits:

• Brake Duct Hose 3" x 10' carries air from the inlet back to the wheel.
• Brake Hose Duct Flange 3" Diameter gives you a secure point to attach the hose.
• Spindle Duct Left Hand and Right Hand mount at the spindle and aim air at the rotor.
• Brake Duct Headlight Mount Centered places the inlet in the headlight opening.
• Brake Duct Offset Single Hole works when a centered inlet won't fit your body.

For longer runs, JEGS brake duct hose comes in 3" x 11' and 3" x 10' lengths. Measure your route from inlet to spindle before you order. Leave slack for suspension travel and full steering lock.

Choosing Brake Duct Hose Size and Material

Choose hose size by matching the diameter of your inlet, flange and spindle duct, then choose material by how hot the route runs. Most spindle-mounted setups use 3" or 4" hose. Keeping one diameter end to end avoids adapters that restrict flow. If you're unsure which size you need, check the outlet diameter on your spindle duct first.

Material matters when the hose passes near headers, exhaust or the brakes themselves. Silicone withstands higher heat than neoprene, so it's the safer pick for tight engine bays and routes close to the rotor. Mishimoto Heat Resistant Silicone Ducting 2 x 12 (MMHOSE-D2) suits smaller runs and tight packaging where a 3" hose won't fit.

Route the hose with gentle bends, since kinks choke airflow. Secure it away from tires, steering linkage and suspension arms so it can't rub through. Steady cooling also helps your disc brake pads wear evenly and keeps pedal feel consistent through a session.

OE-Style Brake Cooling Ducts and Screens

OE-style brake cooling ducts and screens let you restore or protect factory airflow without cutting bodywork. Mopar Accessories offers Air Duct Brake Cooling parts under several part numbers. You'll also find factory-replacement brake ducts and deflectors for replacing damaged factory pieces.

Corvette owners can protect factory duct openings with brake duct screens:

• Aluminum and stainless steel brake cooling duct screens fit 2015-2019 Chevy Corvette Z06 and Grand Sport models.
• Aluminum and stainless steel brake cooling duct screens also fit 1997-2004 Corvettes.
• Rear fender brake duct grille screens fit 2005-2013 Corvettes, except ZR1.

Mesh screens help keep rocks and road debris out of the duct while letting air pass through. Pick aluminum or stainless steel to match your car's trim, and confirm your model year before you order, since each screen fits a specific generation. If you track your Corvette or Mopar, pair factory-style ducting with upgraded performance brakes for more consistent stopping.

Signs Your Race Car Needs Brake Cooling Ducts

Your race car needs brake cooling ducts if the brakes lose bite late in a session or parts wear out faster than expected. Brake fade is the clearest warning. The pedal gets longer or softer, and the car takes more effort to slow down.

Watch for these other signs after a race or track day:

• Pads wear quickly, glaze over or leave uneven deposits on the rotor.
• Rotors show heat cracks or need replacement sooner than they should.
• Braking feels strong early in a session but fades as laps add up.

Ducting addresses all three by keeping temperatures under control, which means less fade, longer pad and rotor life and less rotor cracking. If you're planning a full brake upgrade, read our Wilwood vs. Brembo brake comparison and the JEGS JX Series performance braking guide. Then shop brake ducting now to keep that new hardware cool.