The PAGID Racing RSL 29 brake pad set for AP Racing CP9668 calipers is designed for demanding track, endurance and motorsport use where consistent braking performance, predictable modulation and long pad life are essential.
Manufactured in the correct CP3558D54 pad profile, these pads feature the full 25mm pad thickness required by the AP Racing CP9668 six-piston caliper. The increased friction material volume makes them especially well suited to high-temperature use, longer track sessions and endurance applications.
Key Features
- Genuine PAGID Racing RSL 29 brake pads
- Designed for AP Racing CP9668 six-piston calipers
- Correct CP3558D54 pad profile
- Full 25mm pad thickness
- 54mm pad depth
- Medium friction coefficient
- Excellent modulation and release characteristics
- Long pad and brake disc life
- Consistent low-to-medium friction level
- Easy and predictable bedding-in behaviour
- Ideal for track days, club racing and endurance use
- Supplied as a complete front axle set
Full-Depth 25mm Brake Pads for the AP Racing CP9668
The AP Racing CP9668 is designed around a deep 25mm brake pad, providing substantially more friction material than the 18mm pad used in the CP9660 caliper.
This increased pad volume provides several advantages during demanding use:
- Longer service life
- Greater thermal capacity
- More consistent performance over extended sessions
- Reduced frequency of pad changes
- Better suitability for endurance and high-mileage track use
Proven RSL 29 Endurance Compound
PAGID RSL 29 is one of the brand’s best-known endurance racing compounds. It is widely used in track-day, club racing, touring car, GT and prototype applications.
The compound produces a controlled medium friction level rather than an excessively aggressive initial bite. This allows the driver to apply and release brake pressure progressively, making the vehicle easier to balance during hard braking, trail braking and corner entry.
Its predictable behaviour makes it particularly suitable for drivers who value repeatability and control throughout a full track session.
Excellent Brake Modulation
High-performance braking is not simply about producing maximum bite. A brake pad also needs to respond accurately to small changes in pedal pressure.
RSL 29 is known for its strong modulation and release characteristics. This helps the driver accurately manage braking force at the limit, reducing the risk of upsetting the balance of the vehicle during corner entry.
The progressive response makes the pad well suited to:
- Endurance racing
- Track days
- Club motorsport
- Time attack
- Sprint competition
- Fast road and track builds
- High-power vehicles with large AP Racing brake systems
Long Pad and Rotor Life
The RSL 29 compound is designed to balance braking performance with strong wear characteristics.
When correctly bedded and used with suitable iron brake discs, it offers good pad durability and is relatively disc-friendly compared with more aggressive sprint compounds.
Combined with the CP9668’s 25mm pad format, this makes it an excellent option for drivers who want to reduce pad consumption during longer events and repeated track use.
Compatibility
Designed to fit:
- AP Racing CP9668-2S7L
- AP Racing CP9668-3S7L
- AP Racing calipers using the CP3558D54 pad profile
- Brake kits fitted with AP Racing CP9668 six-piston calipers
These pads may also fit other motorsport calipers using the same CP3558D54 pad shape. Always confirm the caliper model, pad profile and pad thickness before ordering.
Technical Specifications
- Manufacturer: PAGID Racing
- Compound: RSL 29
- Caliper compatibility: AP Racing CP9668
- AP Racing pad family: CP3558D54
- Pad thickness: 25mm
- Pad depth: 54mm
- Pad area: 77.4cm²
- Pad volume: 155.8cm³
- Compound type: Low-metallic resin-bonded racing compound
- Intended use: Track, endurance racing and motorsport
- Axle application: Front
What Is Included?
- Four PAGID Racing RSL 29 brake pads
- Enough pads for one front axle fitted with two AP Racing CP9668 calipers
CP9668 25mm Pads Compared With CP9660 18mm Pads
Although the AP Racing CP9660 and CP9668 use a similar 54mm-deep pad footprint, the pad thickness is different.
The CP9660 uses an 18mm pad, while the CP9668 uses a deeper 25mm pad.
The two pad sets should not be treated as interchangeable. These pads are specifically intended for the CP9668 and its 25mm pad cavity.
The deeper format provides more usable friction material, making the CP9668 particularly attractive for endurance racing, longer track sessions and vehicles with high brake consumption.
Who Are PAGID RSL 29 Pads For?
These pads are well suited to drivers who want:
- Consistent braking across long sessions
- Progressive initial response
- Strong pedal modulation
- Clean release characteristics
- Long pad life
- Good brake disc life
- Predictable performance over repeated heat cycles
- A proven endurance compound for AP Racing CP9668 calipers
Drivers looking for a very aggressive initial bite may prefer a higher-friction sprint compound. For repeatability, control and durability, RSL 29 remains one of the strongest all-round endurance options.
Bedding-In
Correct bedding-in is essential to establish an even transfer layer between the brake pad and disc.
New pads should be bedded using a controlled series of progressively harder braking applications. Avoid holding the vehicle stationary with the brake pedal applied while the pads and discs are at very high temperatures, as this can create uneven deposits on the disc surface.
Where new pads are being fitted to previously used discs, the discs should be inspected for wear, cracking, surface condition and compatibility before installation.
Important Information
PAGID Racing RSL 29 is a motorsport-focused brake pad compound.
Racing brake pads can produce increased noise, dust and different cold-temperature behaviour compared with standard road pads. Road legality and suitability should be checked before installation.
Professional installation is recommended. Brake pads, discs, calipers and fluid should be inspected regularly, particularly on vehicles used for track driving or competition.
Frequently Asked Questions
Do these pads fit AP Racing CP9668 calipers?
Yes. They use the correct CP3558D54 pad profile and 25mm thickness required by the AP Racing CP9668.
Are CP9668 and CP9660 brake pads the same?
No. The CP9660 uses an 18mm-thick CP3905D54 pad, while the CP9668 uses a 25mm-thick CP3558D54 pad.
How many pads are included?
The set contains four pads, enough for one front axle using a pair of AP Racing CP9668 calipers.
Why does the CP9668 use a 25mm pad?
The deeper pad provides more friction material, improving pad life and making the caliper better suited to endurance racing and extended track use.
Are RSL 29 pads suitable for track days?
Yes. RSL 29 is widely used for track days and club motorsport because it combines predictable braking, good modulation and strong wear characteristics.
Are they suitable for endurance racing?
Yes. RSL 29 was developed for endurance use and is well suited to long sessions and repeated high-temperature braking.
Do RSL 29 pads have aggressive initial bite?
They provide a controlled medium friction level rather than an extremely aggressive initial response. This gives the driver a progressive and easily modulated pedal feel.
Do the pads need bedding in?
Yes. Correct bedding is important for consistent friction, even disc deposits and maximum pad life.
Are they suitable for road use?
They are primarily intended for track and motorsport use. Racing pads may generate more noise and dust and may behave differently when cold.
