406 Coupe Club • View topic - Help! The dreaded 3 port brake master cylinder 4601 K9

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BOOTHEGERMANSHEPHERD
 Post subject: Help! The dreaded 3 port brake master cylinder 4601 K9
PostPosted: Wed Nov 26, 2025 6:41 pm 
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Joined: Wed Nov 26, 2025 6:09 pm
Posts: 2
Hi

As it says, I'm hoping someone can help with sourcing this obsolete part?

4601 K9

The spare port is for the ESP pump to pressurise the system

I am wondering if its possible to install a two or 4 port and connect the ESP pump in with a T piece to the two port or blank off the spare port on a 4 port?


The issue is that the system is holding pressure after the brake pedal is released, this is help by the primary circuit of the master cylinder not returning the fluid .

The cylinder is the same style and internal operation as this you tube video which was very helpfu



lhttps://www.youtube.com/watch?v=u9FZbpNmyqk



The thing is that fluid return on the primary circuit has to go back past the centre of the piston rod when the pedal goes back to rest
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