rebuilding a CB type master cylinder..

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ryancr500 · #1 Post by **ryancr500** » Mon Apr 17, 2023 8:56 am

I need to rebuild a CB type master cylinder in place on a series 1 80". I don't want to remove it as the brake lines could be problematic. Does anyone know the size of the gigantic nut on the back of the Master cylinder? Have been looking online but can't find the size... its big

ANDYD · #2 Post by **ANDYD** » Mon Apr 17, 2023 11:58 am

Hi Ryan,

I believe its 1-1/16" Whitworth. You may find a regular socket 1-3/16" will fit (if you don't have Whitworth).
I will try my Whitworth socket on there to confirm and post again,

cheers
Andy

ryancr500 · #3 Post by **ryancr500** » Mon Apr 17, 2023 12:08 pm

Thanks Andy, It seemed bigger than that! I think I tried a 30mm socket I had and it was too small.

ANDYD · #4 Post by **ANDYD** » Mon Apr 17, 2023 12:53 pm

Maybe you have a different earlier CB type?
Is it the 3 bolt flange?

Here is a photo of mine ... 1 1/16 Whitworth I believe would be around 30.5mm?

ryancr500 · #5 Post by **ryancr500** » Tue Apr 18, 2023 7:52 am

I think mine is a little different. I'll have a closer look today.
thanks for sending the pic, yours certainly looks cleaner than mine!

The Rover-Landers of BC

The Rover-Landers of BC

rebuilding a CB type master cylinder..

rebuilding a CB type master cylinder..

Re: rebuilding a CB type master cylinder..

Re: rebuilding a CB type master cylinder..

Re: rebuilding a CB type master cylinder..

Re: rebuilding a CB type master cylinder..