101 Master Cylinder Bore Size

[Homestar]

Anyone know the bore size of the 101 MC? Is it the same front and rear?

TIA.

[grey_ghost]

Hi Gav,

I have a funny feeling that I have a NOS master cylinder at home...

How do I measure it for you?

Cheers,
GG.

[Homestar]

Thanks - I'm after the bore size so piston needs removing - there will be a circlip in the end of it - once removed it will pull apart, but don't go to too much trouble if you're unsure.

[Mick_Marsh]

I've got a spare at home, too.

What are you after, the seal size, or are you getting it resleeved?

[Homestar]

Just after the bore size and wondering if the bore for the front and rear are the same is all. Just thinking out loud at the moment. [emoji4]

[101RRS]

Just thinking out loud at the moment. [emoji4]

But we cannot hear you [biggrin]

[Homestar]

Everyone here at my place can - they often tell me to shut up...[emoji56]

[101 Ron]

From memory both sides of the master cylinder is the same bore of the same size.
I believe a series three master cylinder will fit and work correctly, except one brake pipe outlet is in the wrong spot.
If you rework the pipes a series three master cylinder works.

[101 Ron]

Looking at a old post.
Progress report. (https://www.aulro.com/afvb/101-forward-controls-and-variations/84095-progress-report-7.html)

the photo shows the out side of the master cylinder being stepped...………….now none the wiser.

[Homestar]

Thanks, don't need to replace mine either, just doing some research. [emoji106][emoji4]