AP Racing Catalogue Issue 4

visit www.apracing.com for installation drawings & up to date product range details 62 MASTER CYLINDERS AP Racing Master Cylinders have been developed with the benefit of our unparalleled experience in racing brake technology to respond to the severe demands encountered under competition conditions and are used in all forms of motorsport. The current range of lightweight aluminium alloy master cylinders comprises 14 designs suitable for all forms of com- petition use. Each master cylinder is individually shimmed during manufacture to give a shorter cut off and less lost travel than equivalent production cylinders. Most designs are available in 10 bore sizes from 14.0mm to 25.4mm (1.00”) diameter. Below offers a brief description of each master cylinder within the range. MASTER CYLINDER RANGE ◘ CP2623 - A compact forged bodied flange mounted master cylinder suitable for all brake and clutch applications especially where space is restricted. Short travel to cut off is standard. 10 available bore sizes from 14.0mm to 25.4mm. Hydraulic threads are Imperial. ◘ CP4400 - A compact Master Cylinder which has been specially designed with a ‘centre lock’ bulkhead fixing (10mm Min / 22mm Max thick) to meet the installation requirements of composite structure racing cars. The inlet and the outlet ports are positioned at the end of the master cylinder, away from the bulkhead, to provide clearance for steering racks etc., where required. Extra short travel to cut off, reducing the amount of lost pedal travel, is standard on this cylinder with short cut-off available to order where rapid fluid return is required. 8 bore sizes available from 14.0mm to 15/16”. Hydraulic threads are imperial. ◘ CP4623 - A compact forged bodied master cylinder similar to CP2623 but with a 60° mounting flange offset to give improved ac- cess to mounting bolts. Short travel to cut-off is standard. 9 available bore sizes from 14.0mm to 15/16”. All threads on this master cylinder are metric. ◘ CP5540 - This lightweight double ended (tandem) master cylinder with two separate hydraulic chambers which, when com- pressed by pedal effort, creates two output pressures, one each for front & rear brake circuits only. Version also available for hand brake applications. ◘ CP5623 - A compact master cylinder based on CP2623 but with metric hydraulic ports. 9 available bore sizes from 14.0mm to 25.4mm. ◘ CP6461 - A pull type design, as CP6465 but with a more durable 3/8”UNF Pushrod. Suitable for applications where vibrations and resonance maybe present . ◘ CP6465 - This cylinder operates on the Pull rather than Push principle of other cylinders. It has a built in trunnion, mounted in needle roller bearings for direct mounting to the balance bar. The ultimate in master cylinder efficiency. Metric threads. ◘ CP6467 - This pull type cylinder (Similar to CP6465 family) features centre valve configuration which helps to improve cylinder performance and seal durability. ◘ CP6468 - A new cylinder based on CP6465 type but mounted through a spherical bearing. ◘ CP7198 - A compact flange mounted ‘Push type’ master cylinder with centre valve. CP7198 is similar to CP9093 type but with METRIC hydraulic ports. The centre valve configuration helps to improve cylinder performance and seal durability. ◘ CP7398 - Is a new compact 60° offset flange mounted ‘Push type’ master cylinder. CP7398 is similar to CP7198 type but with IMPERIAL hydraulic ports. The centre valve configuration helps to improve cylinder performance and seal durability. 5 Bore sizes available initially. ◘ CP7854 - A high efficiency single circuit, short push type master cylinder. Fixed through a trunnion system running in needle roller bearings and with a one piece piston / push rod it offers a significant improvement in efficiency over traditional master cylinder designs. Full range of 10 bore sizes available. Imperial threads. ◘ CP7855 - A high efficiency single circuit, short push type master cylinder. Fixed through a spherical bearing and with a one piece piston / push rod it offers a significant improvement in efficiency over traditional master cylinder designs. Full range of 10 bore sizes. Imperial threads. ◘ CP9093 - A compact flange mounted ‘Push type’ master cylinder with centre valve to replace CP6093 family which is no longer available. CP9093 is similar to CP7198 type but with IMPERIAL hydraulic ports. The centre valve configuration helps to improve cylinder performance and seal durability. MASTER CYLINDERS - General Information