AP Racing CP9660 6-Piston Caliper Pair
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AP Racing CP9660 6-Piston Caliper Pair - Universal
The AP Racing CP9660 is a 6-piston radial-mount race caliper from AP Racing's PRO 5000 R range, built for general competition and single-make race series. Its asymmetric, forged two-piece aluminium alloy body gives extra stiffness and consistent clamping under sustained track loads, with differential-bore stainless steel pistons (27.0, 31.8 and 38.1mm), high-temperature seals and 4 lb anti-knockback springs. Each caliper weighs 2.78 kg without pads.
This listing is a matched pair in AP Racing's anodised finish: one left-hand (CP9660-3S4L) and one right-hand (CP9660-2S4L) caliper for a complete axle. It suits discs from 356mm to 380mm diameter and 32mm to 36mm thick, on 180mm radial mounting centres with a 42mm offset, and takes the CP3905D54 pad shape (18mm thick).
Note: AP Racing sells the CP9660 as a pair only. Brackets, discs, pads and lines are sold separately. Mount the calipers within the bleed-screw angles shown on AP Racing's installation drawing: download the CP9660 installation drawing (PDF). Installation by a professional is recommended.
Features
- 6-piston, differential bore: 2 x 27.0mm, 2 x 31.8mm, 2 x 38.1mm (50.1cm² piston area)
- Forged, two-piece aluminium alloy body with asymmetric design
- Radial mount, 180mm centres, 42mm offset, 12.15mm mounting holes
- Suits discs 356–380mm diameter, 32–36mm thick
- CP3905D54 pad shape, 18mm thick, 77.4cm² pad area
- Stainless steel pistons and wear plates, high-temperature seals
- 4 lb anti-knockback springs fitted
- 2.78 kg per caliper (no pads)
Kit Contents
- 1 x AP Racing CP9660 left-hand caliper (CP9660-3S4L)
- 1 x AP Racing CP9660 right-hand caliper (CP9660-2S4L)
Need help matching discs and brackets? Contact our team at sales@chicaneaustralia.com.au.
Vehicle Compatibility
Universal fitment — verify dimensions before ordering.
Product
- Brand
- AP Racing
- Piston sizes
- 2 x 27.0mm, 2 x 31.8mm, 2 x 38.1mm
- Part number(s)
- CP9660-3S4L (LH) / CP9660-2S4L (RH)
Details
- Range
- PRO 5000 R
- Product
- CP9660 6-piston race caliper pair (LH + RH), anodised
- Piston area
- 50.1cm²
- Mount type
- Radial
- Mounting centres / offset
- 180.0mm / 42.0mm
- Mounting hole
- 12.15mm nominal
- Disc diameter
- 356mm min / 380mm max
- Disc thickness
- 32mm min / 36mm max
- Pad shape
- CP3905D54 – 77.4cm² area, 54.0mm depth, 18.0mm thick
- Body
- Forged two-piece aluminium alloy, asymmetric design
- Pistons / wear plates
- Stainless steel
- Seals
- High temperature (seal kit CP8518-CEJ)
- Anti-knockback springs
- 4 lb (CP6518-4LBSSL)
- Hydraulic threads
- M10 x 1.0
- PL dimension
- 63.5mm
- Bleed screw torque
- 17Nm
- Weight (each, no pads)
- 2.78 kg
- Sold as
- Pair (one left, one right)
Contents
1 x AP Racing CP9660 left-hand caliper (CP9660-3S4L)
1 x AP Racing CP9660 right-hand caliper (CP9660-2S4L)

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