MGA Twin Cam Brake Master Rebuild Kit SP2590

MGA Twin Cam Brake Master Cylinder rebuild kit. This kit will fit all original Dunlop master cylinders. We have included a picture of the master cylinder for identification purposes. 

Part Number SP2590 (SC8496)  Note this kit will fit either early or late Dunlop master cylinder. Use seals as required

Below information supplied by MGA Guru

Pages from Service Parts List, Version 3, showing the change in Dunlop brake master cylinder. The earlier assembly BHA4071 has the single O-ring piston and calls for Service Kit SC8196. Superseded  to SC8496. The later kit includes newer style seals and will convert the early master cylinder to the later type BHA4157. It is not necessary to list part numbers for the parts in the kit, as the piece parts were not sold separately. Since the housing is not changed you cannot tell what parts are inside the unit until it is disassembled. 

At some point in time (soon after the Twin Cam was built) Girling took over support of Dunlop brakes. Thereafter replacement parts would have the Girling name on the packages and part number SP2590.