AP Racing Catalogue Issue 4

48 visit www.apracing.com for installation drawings & up to date product range details INTRODUCTION As the foremost manufacturer of brake systems for competition and high performance vehicles, AP Racing are continually developing and improving our product ranges. The friction material used in a brake system is a vital factor in the overall performance of that system and it is therefore important to choose the correct pad for the particular application, which is why AP Racing has now developed its own (APF) branded range of brake pads to suit AP Racing Calipers for both Road and Competition applications, thus ensuring full system integrity. The range currently comprises 5 Material Grades across 27 Pad Shapes. (See page 49 for more technical details) AP Racing’s unparalleled experience in racing brake technology puts us in a unique position to evaluate friction materials and brake pad performance both on our dynamometer test beds and through rigorous vehicle track testing. NOTE: AP Racing policy is to offer a range of the best friction materials currently available from whatever source. BRAKE NOISE Brake noise or squeal is a vehicle system problem since the severity, regularity and tone is a function of the brake and suspension components in combination. This does not represent a problem on competition vehicles where performance is the primary objective but is generally unacceptable for road use. Some vehicles are particularly susceptible to the problem. The contact between the pad and disc during braking creates the raw energy to produce the noise but the actual squeal can be primarily or a combination of the disc, caliper and pad. Elimination of squeal under all brake operating conditions is difficult to achieve when specifying a brake package whose purpose is to safely absorb very high energy inputs. A number of methods are available to reduce the noise factor of a brake system but assuming the base vehicle suspension system is settled, the reduction or elimination of noise is usually achieved by a process of trial and error. The first and easiest solution to try is the ad- dition of high temperature grease to the back of the pad to provide a damping medium between the piston and pad. Typically Copper Slip is applied although care must be taken to avoid any grease coming into contact with the pad face. The use of high friction brake pads such as Pagid RS4-2 / M1177 creates high energy at the friction interface which can characteristically lead to more brake squeal but some pads are typical for their lower noise rating. These pads are characterised by their lower friction coefficient and reduced initial ‘bite’. Examples of such a material is Ferodo 3432F. There are a number of disc variants available fromAP Racing & the type chosen can have an affect on brake noise, depending again on the pad choice. Generally it is found the multi drilled or grooved discs used in conjunction with competition pads will give unacceptable noise levels for road use, Plain face discs can cause higher levels of squeal, as the pad is not cleaned by the actions of holes or grooves. For the AP Racing Factory Big Brake kit conversions, we have found a reduced drill pattern with a radiused edge and using APF405 pads give little or no pad noise and still have good performance. Where the noise is a function of the brake pad temperature, characterised by the noise reducing, (possibly to zero) as the brakes are used more frequently and severely. The pad may also respond to the addition of pad chamfers which reduce the effective pad area and change the pad shape / centre of pressure. These chamfers (10,0mm x 30 degrees) can be added to the leading edge first and their effect assessed prior to the addition of a chamfer on the trailing edge. Please contact AP Racing technical department for more details. BRAKE PADS - General Information GENERAL INFORMATION Pages 51 to 55 provide details on a range of pads and friction materials, including our own new APF range for competition and road use with AP Racing brake calipers. This section also includes information to assist in the selection of the most suitable pad for a given application and other useful information on choosing the correct brake pad. AP Racing Technical department will be pleased to advise on the most suitable equipment for any particular application and can provide more detailed technical information if required. BRAKE PAD TEMPERATURES An important factor in consistent brake performance is maintaining the operating temperatures within the effective range of the pad material being used by controlling the flow of cooling air from the brake ducts. There are several different methods of monitoring the brake system temperatures:- 1. THERMAL PAINTS / 2. BRAKE TEMPERATURE PYROMETER / 3. TEMPERATURE STRIPS For more detailed information of these methods please go to page 44. ‘BEDDING IN’ PROCEDURES ◘ RACE FRICTION MATERIALS: - AP Racing offer a large variety of the best friction materials currently available from various sources to suit every racing condition. It is therefore very difficult to recommend a common ‘Bedding in’ procedure suitable for all friction materials. Please refer to the manu- facturer’s own ‘Bedding’ information for guidance. ◘ ROAD FRICTION MATERIALS: - For Pads for AP Racing brake calipers or kits use the following procedure:- Bed the pad and disc contact areas by using moderate brake applications for 80Km (50 miles), avoiding excessive speeds, building the stopping power and vehicle speed gradually over the next 80Km (50 miles). This will ensure maximum pad performance and disc life. FOR OE APPLICATIONS PLEASE REFER TO THE MANUFACTURER’S OWN INSTRUCTIONS. ANTI-SQUEAL SHIMS Anti squeal shims are very effective and CP5070 pad family have them fitted as standard. Anti squeal shims are also available for other pad families, but if you experience noise using other pad families please contact the road car technical department for further advice MATERIAL AVAILABILITY In order to get the best performance from your AP Racing brake system, it is important to choose the friction material which best suits the particular applica- tion. AP Racing offer a large variety of the best friction materials currently available from various sources to suit every racing condition. The individual pad profiles on pages 51 to 55 give information on all the friction materials available for that pad in the current range. NOTE: Should you wish for a pad profile in another material please contact AP Racing Technical department for more information. PAD ORDERING 1. Refer to caliper listing on page 56 to obtain the correct pad shape for a given caliper and check this against the pad shape illustrations on pages 51 to 55. 2. Consult individual pad profile and select the material from those available referring to the information on pages 47 to 49 if necessary. 3. Example part number below: CP3894D54-APF403. This part number comprises 4 pads (1 axle set). 4 . Construct part number as in the example below by adding the material suffix to the basic pad shape family number. ◘ All pads with the following exceptions are sold in sets of 4.- CP4226, CP3086, CP4484, CP3386, CP2372, CP3666, CP4466 are in pairs (2 pads). ◘ NB. For Carbon / Carbon pad material see page 46 for more details ◘ NB. Materials with the blackout segments are on phase out mode and once stocks have been exhausted will be made inactive. EXAMPLE PAD PART NUMBER Pad Radial Depth 54.0mm Pad Family Part Number - Defines Pad Shape & Thickness18.00mm (0.71”) CP3894 D54- APF403 Pad Material APF403