380mm Track Brake Kit — Engineered for Serious Performance
This kit was developed to deliver a truly uncompromising 380 mm braking solution for dedicated track enthusiasts. At its core are the exceptional AP Racing Pro 5000 R calipers — the benchmark for motorsport braking performance.
Every component in the kit is specifically designed for the application and CNC-machined to exacting standards, ensuring strength, precision, and long-term reliability. We use stainless steel thread inserts in all threaded aluminium components and only supply zinc-coated grade 10.9 fasteners for maximum strength (grade 12.9 fasteners carry a higher risk of hydrogen embrittlement, especially when plated or in demanding environments).
Traditionally, there have only been two options with AP Racing kits:
- BTCC kits supplied with used race rotors and only available in one size (368×36 mm).
- Expensive kits using new AP Racing rotors.
The aim with all Renn Stop brake kits was to design a cost-effective, fully featured motorsport kit with low consumable costs, using only new components.
We use EBC racing rotors in our kits as these deliver exceptional quality, high vane count, high carbon castings, and come with a heat-resistant black coating as standard.
Key Features
AP Racing Pro 5000 R Calipers
Built for uncompromising motorsport use:
- Stainless steel pistons
- Anti-knockback springs
- High-temperature seals
- High-stiffness, lightweight body
- Significant reduction in unsprung mass vs OEM system
Performance Advantages
- Improved pedal feel due to caliper stiffness and anti-knockback springs
- Exceptional stopping power
- Higher thermal capacity for sustained track use
- Improved cooling efficiency
- Wide compatibility with readily available pad compounds
Comparison Table
Quick comparison of basic features and consumable cost between Renn Stop kits and BTCC used rotors. Note: costs are for total replacement of 1 rotor; BTCC rotor condition and price will vary based on availability and wear.
 |
 |
|
|---|---|---|
| Front Size | 380 × 36 mm | 368 × 36 mm |
| Front Caliper Option | CP9660 (Standard) or CP9668 (Endurance) |
Typically CP9660 Only |
| Rear Size | 380 × 30 mm or 380 × 28 mm (2NH) |
No matching rears available |
| Rear Caliper Option | CP9449 | — |
| Condition | New | Used |
| Rotor Cost | £235 | £145 – £187 |
| Bobbin Cost | £65 | £110 |
| Anti-Rattle Clip Cost | Included | £27 |
| Total per Disc | £300 | £282 – £324 |
Key Features & Engineering
FEA-optimised design: Stress simulation showing weight reduction in areas of low stress
- Lightweight components CNC-machined from 6082-T6 aerospace-grade aluminium
- FEA-optimised design for maximum stiffness and minimum weight
- Designed by a mechanical engineer with over 15 years of industry experience
- Lower consumable cost compared to other premium kits
- Fully floating 380×36 mm front rotors
- Matching 380×30 mm rear rotors (or 2NH 380×28 mm standard disc option)
- Anti-rattle springs included as standard — no hidden extras