To identify a genuine AP Racing iron disc, you need to examine the outer radius of the disc. To compound the problem, some companies have offered their own line of discs manufactured by someone other than AP Racing, but then applied AP's numbering convention to them! As a result, figuring out what exactly that hunk of iron in your hand actually is, may be more challenging than one would expect. While some can be found in their current print catalog or on their website, many of the part numbers are no longer sold, and there are no longer references to them anywhere. anti-knockback springs behind the pistonsĪs with calipers, AP Racing has manufactured a tremendous array of brake discs over the years in varying sizes, shapes, slot patterns, etc. Applying the numbering system to the Pro5000R caliper in the image above (CP9660-3S4L), we can decode the caliper as: If you’re the particularly curious type, an explanation of the AP Racing caliper part number system can be found in the image below. Okay, but what does the part number mean?
#CALIPER BRACKET SERIAL NUMBER#
On AP’s latest Pro5000R Radi-CAL calipers, the caliper’s specific part number and serial number is now located on the inner half of the caliper near the inlet port (where the caliper connects to the brake line).Īgain, the important takeaway is that only the number above the caliper serial number is the complete part number, and it will follow the CPXXXX-XXXXX alphanumeric format Here’s another example, this time on a caliper from AP’s latest World Radi-CAL II road caliper range. Please note that the caliper body’s broader casting or forging number could be in other locations on the caliper body, such as near the inlet port. That is the casting or forging number for the caliper body, but it is NOT this specific caliper’s complete part number. If you look near the pistons in the top of the pic, there’s another number starting with CP5060. Below the caliper part number is this specific caliper’s serial number. The complete part number for the caliper in the image below is CP5060-23S4L. Let’s look at an example to ensure clarity. The arrow near the part number denotes the direction the disc should be spinning when the caliper is installed, which can help ensure you’re installing the caliper on the correct side of the car. The first is on the underside of the caliper body: Flip the caliper over, and on the bottom of the piston bores will be an etching of the caliper’s complete part number, followed by that specific caliper’s serial number. Only the complete caliper part number contains all the relevant information for proper identification.ĪP typically uses two caliper locations for complete part numbers. That’s where the caliper part numbers come into play, and they are irreplaceable for communicating specific product data. If you wanted spare piston seals and pads for a caliper in your possession, you’d need to know the piston bore sizes, pad thickness, and pad radial depth to ensure you received the correct parts. When you combine all those variables, there is a lengthy list of potential part numbers to contend with. Although there were only a few core caliper castings (the basic caliper body), AP used the same castings to produce a variety of calipers that had different widths, pad thicknesses, pad radial depths, piston sizes, some were leading (front side of the disc), some were trailing (back side of the disc), etc. The Pro5000+ range included several six, four, and two piston variants. For example, AP’s Pro5000+ range of calipers were a staple in racing for a couple decades. Just because two calipers look the same at first glance, there’s a good chance they could have quite a few differences between them.ĪP typically breaks their calipers down into ‘families’ or ‘ranges’ of related calipers.
AP has designed and manufactured an extraordinarily diverse range of both street and racing calipers over the years. The objective of this article is to help you properly identify the AP Racing brake components you have, so Essex can provide the most timely service possible.Ĭalipers are one of the AP Racing’s most complicated products. In nearly all cases, it’s not just as easy as glancing at a pic and knowing what we’re dealing with. While it may sound like a simple task, AP Racing has produced many thousands of unique brake components throughout their storied fifty-year history, and many of those parts are incredibly similar in appearance. Callers expect our team of brake experts to quickly recognize their components and provide appropriate solutions.
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