AP Racing Radi-CAL 394mm Competition Brake Kit 992 GT3/GT3RS (Front)

Fit The Following Cars

• Porsche 992 GT3 
• Porsche 992 GT3RS 
  

Complete AP Racing Radi-CAL Competition Brake Kit for the Porsche 992 GT3/GT3RS (Front)

May interfere with front anti-roll bar under certain conditions. Please see TSB below.

• Jewel-like ENP Caliper finish is incredibly durable and easy to clean
• Durable, ventilated stainless steel pistons (no ceramic piston caps to break) with anti-knockback springs
• Design eliminates the need to remove caliper for pad changes
• Saves 17 unsprung lbs. vs. OEM iron brakes and very close in weight to the OEM PCCB system
• Allows for the preservation of pricey OEM brake components
• Huge array of brake pad options from all major pad manufacturers
• 394x34mm, 84 vane AP Racing J Hook Discs
• Every component designed to resist the heat of extended track sessions
• Pistons sized properly to allow for seamless integration with OEM master cylinder and ABS system
• Includes pad tension kit (eliminates noise) and disc burnishing at no additional cost
• Designed to work with OEM rear brakes or the Ap Racing rear brake kit
• Includes the AP Racing pad tension kit and disc burning at no additional cost
• Designed to work with OEM rear brakes or the AP Racing Rear Brake Kit

Porsche 992 Technical Service Bulletin ("TSB")

The Porsche 992 GT3/GT3RS introduced some dramatic suspension changes vs. the 991 chassis, most notably moving from a McPherson Strut configuration to double wishbone at the front of the car.  The resulting packaging and geometry changes create some potential brake clearance issues under certain driving conditions.  With the brake lines attached to the standard front caliper inlet port contact may occur between the brake line banjo fitting and the front anti-roll bar (ARB) drop links or the ARB itself.  The interference issue is more pronounced in our CP9669 Kits due to the extremely wide calipers but can also impact our CP9661 Kits to a lesser extent.

Porsche delivers these cars with the front and rear ARBs set to the middle position.  Potential interference between the brake line fitting and drop links becomes more likely to occur as:

• The anti-roll bar is adjusted towards the softest setting (the hole closest to the end of the bar)
• The steering wheel is turned towards full lock
• The suspension is under full droop (extended as far as possible)

To address this clearance issue, AP Racing has developed the following solution:

• Relocate the caliper hydraulic connection from its current position to the lower bleed screw.  This requires a new Spiegler brake line of a different length with a new banjo bolt design manufactured by Spiegler.
• The original inlet port in the center of the AP Racing caliper will be closed off with a plug.

CP9661 Kit, part# 13.01.10141/13.01.10141-ENP

On our CP9661 front caliper kits in the as-delivered configuration (brake line attached to the inlet port in the middle of the caliper), interference between the drop link and the brake line fitting may occur when the ARB is adjusted to the softest setting as you approach full steering lock and full suspension droop.  

If you won’t be running the ARB in the softest setting with our CP9661 kit, you should not anticipate any issues, and you should not expect any interference when the ARB is set to the medium or stiff settings.  If you do plan to run your front ARB in the softest setting, we suggest implementing our brake line relocation as described above, which will provide adequate clearance in all ARB settings.

CP9669 Kit, part# 13.01.10142-ENP

The wider calipers in our CP9669 kits extend further into the wheel well, which creates more potential clearance issues.  With the brake line attached to the center inlet port and the ARB set in the soft or middle settings, there may be interference between the brake line banjo fitting or the caliper body with both the ARB drop links or the ARB itself.

With the brake line relocated to the lower bleed screw port, the CP9669 calipers have adequate clearance with the front anti-roll bar end links when they are set in the middle or stiffest positions.  The caliper will not clear the front anti-roll bar adjusted to its softest setting, so the ARB cannot be run in that setting.  Under full droop and full lock, the end of the anti-roll bar itself may make minor contact with the inlet port plug, but the likelihood of putting the components in those positions under normal driving conditions is very low.