Repair Kits and fitting Instructions for CP2623, CP4400, CP4623, CP5623 & CP6093 Cylinders

Repair kits are available for all Master Cylinder bore sizes. Kit contents are detailed below.

repair kits

 

Important Note:
13/16" Bore master cylinders repair kits:
Our common 13/16" primary master cylinder seal is no longer available and the replacement is not interchangeable, this will result in AP Racing not being able to supply the repair kit CP2623-93RK any longer. The link below helps identify which piston is fitted to a master cylinder. in future the only way in which a CP2623 type master cylinders built with the old seal can be serviced will be to supply a seal kit CP2623-930PRK including the new piston and thereafter a new repair kit CP2623-930RK including the new seal will be required.


13/16" Repair kit details


INSTRUCTIONS:
1) Remove rubber boot (11) and curclip
(10)
2)
Carefully remove internal components.
3) Replace the following. (making sure all mseals have been lubricated with brake fluid). Primary seal (4), Piston Washer (5) and the Secondary Seal
(7). (Care must be taken when assembling seals as damage maybe caused).
4)
Check bore is free from debris.
5) Lubricate bore with brake fluid.
6) Re-assemble internal components into body.
7) Use new circlip (10) to secure internal components and new boot to protect from debris (11).


Ref.
Description
Included in Repair Kit.
1.
Body
No
2.
Spring Guide Pin
No
3.
Master Cylinder Return Spring
No
4.
Primary Seal
Yes
5.
Piston Washer
Yes
6.
Piston
No
7.
Secondary Seal
Yes
8.
Push Rod
No
9.
Piston Stop Washer
No
10.
Circlip
Yes
11.
Boot
Yes

Universal Repair Kits
Cylinder Bore Size
Part Number
Use With Cylinders
14.0mm (0.551")
CP2623-88RK
CP2623
CP4623
CP4400
CP5623
CP6093
15.0mm (0.590")
CP2623-89RK
15.9mm (0.625") 5/8"
CP2623-90RK
16.8mm (0.661")
CP2623-905RK
17.8mm (0.70")
CP2623-91RK
19.1mm (0.75") 3/4"
CP2623-92RK
20.6mm (0.812") 13/16"
CP2623-930RK or
CP2623-930PRK
22.2mm (0.875") 7/8"
CP2623-94RK
23.8mm (0.937") 15/16"
CP2623-95RK
25.4mm (1.00")
CP2623-96RK