AP Racing Catalogue Issue 4

69 visit www.apracing.com for installation drawings & up to date product range details MASTER CYLINDERS - Motorcycle General Information & CP4125 Type INTRODUCTION The range of AP Racing master cylinders are patented worldwide, state of the art products, offering the ability to precisely set the braking performance of any motorcycle under all conditions. CP4125 Cylinder has a unique radial pull type design, with variable lever ratio and span adjustment, which can cater for all hand spans. All AP Racing master cylinders are meticulously manufactured and rigorously tested for the peace of mind of the rider. MASTER CYLINDER RANGE CP4125 This unique design of pull type handlebar master cylinder provides the user with the ability to adjust the ratio and the lever position as required. The single chamber configuration allows the compact design to weigh only 320grams, and is now non-handed to allow it to be used as a clutch master cylinder. This master cylinder is typically used on Superbike as well as Road Applications. Use with remote fluid reservoir (not supplied). CP3125 The original adjustable ratio master cylinder used by GP and Superbike teams in the 80’s. Can be used to upgrade any brake system. Available with integral reservoir only. CP3756 This uniquely developed, single chamber, pull type rear master cylinder, has been designed for use on all solo motorcycle applications. The pull type configuration allows an exceptionally compact design for ease of installation. Weight 100grams. CP2215 Due to demand, CP2215-90 “Classic” master cylinder has been added to the range. The assembly is based on the original CP2215-20 cylinder, but using the latest seal technology. CP2232 Due to demand, CP2232-90 “Classic” rear master cylinder has been added to the range. The assembly is based on the original CP2232-12 cylinder, but using thelatest seal technology. RECONDITIONING NOTES CP4325, CP4225. - User reconditioning is limited to replacing lever assemblies. However, AP Racing offer a reconditioning service for seal and piston replacement, where the use of specialist test equipment is necessary to set up the master cylinder. CP6125, CP4125, CP3125, CP2215 & CP2232 - User servicing of these master cylinders is possible and seal repair kits are available. Obsolete master cylinder seal repair kits are available for those cylinders which are no longer detailed in this catalogue, please contact AP Racing technical department for help. IMPORTANT NOTE: IF ANY IMPACT IS SUSTAINED ON THE LEVER OR CYLINDER BODY, THE COMPLETE MASTER CYLINDER AS- SEMBLY MUST BE SENT BACK TO AP RACING FOR EXAMINATION OR BE REPLACED. CP4125-26 Adjustable Ratio Master Cylinder FEATURES ◘ Single chamber configuration. ◘ This unique design of pull type handlebar master cylinder provides the user with the ability to adjust the lever ratio and the lever position in increments as required. ◘ Reverse for use as clutch master cylinder. ◘ Use with remote fluid reservoir. (Not supplied) ◘ Incremental ratio adjustments. Ratio is 6.88-14.45:1 TYPICAL APPLICATIONS ◘ Superbikes ◘ Road. ASSEMBLY PART NUMBER CP4125-26 (17mm to 20mm effective bore) TECHNICAL SPECIFICATIONS ◘ Weight - 304g ◘ Range Effective bore size - 16mm -20mm. ◘ Actual bore size - 22.0mm (0.86”) ◘ Hydraulic Connections - Outlet thread - M10 x 1.0 ◘ Bleed Screw Tightening Torque - 5.5Nm (4lbsft) ◘ Repair Kit - CP4125-26RK ◘ Download latest issue installation drawing from : www.apracing.com RATIO ADJUSTMENT GUIDE This variable ratio master cylinder has a knurled wheel to adjust the ratio. This adjuster is rotated to increase or decrease the lever ratio. TECHNICAL SPECIFICATIONS & NOTES ◘ Master Cylinder will be supplied with the wheel adjuster set at position 0 (i.e. with the fulcrum point at end of guide slot in lever, nearest to end of the handlebars, as drawn) at this setting piston travel is at its maximum, which will give best condi- tions for bleeding the brake system. Typical working stroke is shown as a guide only, working stroke should be set to rider’s preference. After initial setting, only small adjustments, typically ±1 turn, should be necessary to suit differing condi- tions. The ratio adjuster wheel has a detent mechanism, allowing it to be moved ¼ turn per click. No locking of the mechanism is required. Lever travel will usually increase slightly in dynamic applications over static settings due to disc run-out etc. It’s therefore advisable to set lever feel on the hard side for initial test. ◘ Master Cylinder will be supplied with the lever reach set at the nominal position as drawn. To obtain a longer reach the adjuster should be turned anti-clockwise using the reach adjuster wheel to suit rider’s preference. Conversely, the adjuster can be turned clockwise to give a shorter reach. Adjustments should be made in ¼ turn increments, but should not be set between detent positions. The correct lever reach should be established prior to any adjustment to the lever ratio, using the wheel adjuster. ◘ Outlet fitting is not supplied with assembly as standard, but Tecalamit or Aeroquip are available on request. ◘ To remove lever sub-assembly, take the Master Cylinder off the handlebar, then set wheel adjuster in position 0. Knock out spring and remove the lever reach adjuster wheel. Turn the exposed pull rod clockwise using the 1mm slot, in its end, until the lever assembly is disconnected from the pull rod. The lever, sub-assembly will then slide out from the retaining flanges. To replace lever sub- assembly reverse the above procedure. ◘ Important: If any impact is sustained on lever, causing a high pressure input to brake system, whole system should be replaced.