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Stop Tech Big Brake Kit (FRONT) 355/32mm: Audi A4 02-05, A6 00-01, S4 99-02, S4 04-06 & Passat 4Motion except W8

Stop Tech Big Brake Kit (FRONT) 355/32mm: Audi A4 02-05, A6 00-01, S4 99-02, S4 04-06 & Passat 4Motion except W8

Item Number:



Audi S4 99up, A6 2.7T, A4 2002up, Passat 4Motion except W8: Brake Kit - Front, 2 piece 355mm x 32mm floating directional drilled or slotted rotors with 4 piston ST40 calipers, DOT compliant stainless steel brake lines, and AXXIS Ultimate brake pads.


StopTech 83-130-4700 Audi allroad front Big Brake Kits include 2 piece floating directional 332mm x 32mm StopTech AeroRotors with 7075 T6 billet aluminum StopTech AeroHats, 4 piston StopTech ST-40 calipers, StopTech Stainless Steel front brake lines and StopTech Street Performance front brake pads. StopTech Big Brake Kits are available with black, red, or silver calipers and plain, slotted or crossdrilled rotors.

StopTech Big Brake Kits improve aesthetics and exceed stock brake performance in three areas. First, larger rotors increase heat capacity. Second, improved brake cooling dissipates absorbed heat. Third, stiffer calipers and stainless steel lines reduce system compliance.

The key, however, is to increase heat capacity and reduce compliance without upsetting the stock front to rear brake torque ratio, also referred to as brake bias. Regardless of rotor diameter, brake pedal ratio, brake pad material, or number of pistons in your calipers, your maximum deceleration is limited every time by the tire to road interface. If the brake upgrade you select adds too much front brake torque (as many do), it will drastically shift the brake bias too far forward and reduce your car's ability to utilize the maximum traction of the tires at all four corners (even on ABS equipped cars), increasing stopping distances dramatically. In addition, too many pistons or pistons that are too large will make the brake pedal much more difficult to modulate, which limits a driver's control of brake input.

 Advantages of StopTech Big Brake Kits over other brake upgrades:

  • StopTech Balanced Brake Upgrades™ with optimum brake bias offer the shortest stopping distance with the best pedal feel
  • StopTech offers the stiffest aftermarket calipers available, their patented bridge results in better clamping under hard braking and less pad taper
  • StopTech's patented AeroRotors® offer the best airflow available which results in better cooling, less fade and longer rotor and pad life
  • StopTech Stainless Steel Brake Lines are resistant to expansion which offers better brake modulation and a firmer brake pedal
  • StopTech Brake pads combine the benefits of premium street brake pads with aggressive friction formulas suitable for track day and autocross use.


StopTech ST-40 - 4 Piston Calipers

StopTech's ST-40 calipers are manufactured using a squeeze-forging process at Sanyco, a 34-year old company that is CNS, QS 9000, and ISO 9002 certified. Mitsubishi®, Volkswagen® and Toyota® are among their top customers. With squeeze forging, pressure is applied during cooling. This produces a beautifully finished, solid part, without porosity. StopTech does all finish machining (such as piston bores sized correctly for the application), assembly and test in California. Calipers that are cast without being squeeze forged can have major issues with porosity which can even cause calipers to leak. Dust boots are standard on StopTech calipers to keep the pistons clear of contamination and extend the service life of the calipers. Competitors calipers designed without dust boots require rebuilding every two years.

 Advantages of StopTech's ST-40 - 4 Piston Caliper:

  • Pistons sized to match brake kit to vehicle application
  • ST-40 caliper uses standard FMSI D372 brake pad
  • 100% leak down and pressure tested to 2,500 PSI
  • Differential piston sizes minimize pad taper
  • Made of Squeeze Forged aluminum alloy
  • Weight: 7.94 lb (3.6 kg) unloaded
  • Dust boots are standard


StopTech's Patented Caliper Bridge

Using finite element analysis (FEA) modeling software, StopTech has designed a bolt-in bridge strong enough to stop distortion without sacrificing cooling through the top of the caliper. The squeeze forged StopTech ST-40 caliper has the least flex of any tested aftermarket or OE caliper. The air channel in the bridge helps air flow through the retainer, resulting in better cooling.

The chart below shows the results of testing 25 leading caliper models by the major caliper companies. Each caliper was subjected to the same pressures and deflection was measured with a dial caliper. StopTech calipers were the stiffest caliper of the major brands tested.


 Advantages of Stiffer Calipers:


  • Better performance with no vibration or noise
  • No radial pad taper
  • Better pedal feel


Slotted Rotors  (831304700-1)
Drilled Rotors - Add $100  (831304700-2)

Price: $3,295.00   Sale Price: $2,889.00  Quantity:

APPLICATIONS :   ( Vehicle Type & Year / Engine )
Audi A6 2000-2001 2.7T
Audi S4 2000-2002 2.7T
Audi S4 V8 2004-up 4.2L V8
Passat B5 1998-2000 1.8T
Passat B5 2001.5-up V6
Passat B5 1998-2000 V6 30V
Passat B5 2001-up 1.8T
Passat B5.5 2001.5-up 1.8T
Passat B5.5 2001.5-up V6