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AP Racing rear brake kit for the S550 Mustang with 340mm two-piece discs and calipers

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Angled view of the CP5040 caliper for the S550 Mustang

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AP Racing Competition Rear Kit 340mm - S550 Mustang

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Brand: AP RacingSKU / Part #: 13.01.10044

Regular price: $3,499.00
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AP Racing Competition Rear Kit 340mm - S550 Mustang

Subtotal: $3,499.00

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Overview

The AP Racing by Essex Competition Brake Kit is a rear brake upgrade for the 2015-2023 S550 Mustang, including Mach 1. It pairs AP Racing CP5040 racing calipers with 340 x 28mm, 60-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving.

Why upgrade

The kit removes about 12 lb of unsprung weight from the rear of the car compared with the OEM brakes. Each caliper weighs 5.8 lb without pads, against 8.4 lb for the factory caliper. Each two-piece disc weighs 10.98 lb, compared with 15.4 lb for the original disc. The caliper takes a 16.7mm thick pad for long life and heat tolerance. Every component is designed to resist the heat of extended track sessions. Pistons are sized to work seamlessly with the OEM master cylinder and ABS.

Caliper and disc construction

On the S550 Mustang, the CP5040 caliper mounts radially on a dedicated bracket at 152mm centers with a 44.1mm offset, with an M10x1.0 inlet thread. Spiegler stainless steel brake lines with a clear sheath reduce compliance compared with the OEM rubber lines. The caliper uses a commonly available 16.7mm thick pad shape. Ventilated, domed-back stainless steel pistons keep heat out of the brake fluid for a very firm pedal. Anti-knockback springs behind the caliper pistons limit pad knockback. The anodized caliper finish resists wear and deterioration at high temperatures. Stainless steel caliper hardware gives a long service life even with frequent pad changes. There are no dust boots to burn up at track temperatures.

Features

AP Racing CP5040 four-piston calipers
340 x 28mm, 60-vane J Hook discs on floating hats
About 12 lb less unsprung weight
16.7mm thick brake pads
Pistons sized for the OEM master cylinder and ABS

What's Included

One pair AP Racing CP5040 racing calipers
One pair 340x28mm AP Racing CP3864 60 vane J Hook racing discs, with fully floating 6061 aluminum hats and attachment hardware
One pair caliper mounting brackets and hardware
One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
Detailed installation instructions

Brake pads are not included.

Specifications

Manufacturer part number	13.01.10044
Brand	AP Racing by Essex
Position	Rear
Application	Track
Caliper	AP Racing CP5040-26S4L/27S4L racing, radial mount
Caliper weight (no pads)	5.8 lb each (OEM 8.4 lb)
Piston sizes	28.5mm x 2, 31.75mm x 2 (31.73 cm2 total area)
Mounting centers / offset	152mm / 44.1mm
Inlet thread	M10x1.0
Disc	CP3864-100/101GA two-piece floating, 340 x 28mm, 60 vanes, J Hook
Disc weight	10.98 lb each (OEM 15.4 lb)
Pad thickness	16.7mm
Pad dimensions	132.4 x 42 x 16.7 mm
Brake pads	Not included
Shipping weight	40 lb (18.1 kg)

Video

Fitment notes

This rear kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Essex has confirmed clearance with OEM rear GT/Performance Pack 19 inch. Check your wheel with the Essex wheel fitment template before ordering.

Fitment

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.
Year	Make	Model	Chassis	Engine
2015-2023	Ford	Mustang EcoBoost	S550	2.3L Turbo I4
2015-2023	Ford	Mustang GT	S550	5.0L V8
2021-2023	Ford	Mustang Mach 1	S550	5.0L V8

Fitment

Year	Make	Model

Not sure? Text us your VIN and we’ll confirm.

Shipping & returns

Shipping: Orders ship via UPS, FedEx or USPS, from our facility near Los Angeles or directly from the manufacturer. Rates for many items are weight-based and shown at checkout. If you need it by a certain date, text us before you order.

Returns: Unused items in brand-new condition and original packaging can be returned within 30 days of the invoice date, with a 25% restocking fee unless otherwise specified. In some cases we can offer a lower fee with the balance as store credit. Shipping charges aren't refundable in either direction unless approved by AutoTalent.

Not returnable: special-order or custom items, and anything that has been installed, modified or altered.

Cancellations: free if the item is out of stock or we miss the ETA you agreed to. Other cancellations carry a 5% processing fee to cover card fees we can't recover. Special-order items can't be cancelled.

Damaged in transit? Report it to the carrier and to us within 48 hours, keep all packaging, and don't send anything back without our written approval.

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