What size master cylinder is this?

[Giuls1]

Anyone know the size of this master cylinder? Doesn't say on the side like my other one does
29819

[Giuls1]

Anyone ? Trying to figure out if it's big enough to use on a rear disc conversion for a civic cxi

[Hondarally]

Is it off a rear disc setup? If not, you'll probably have to remove the residual pressure valve to use with rear discs. When you do that you can measure the cylinder bore and report back.

[Giuls1]

Yer. Is that the prop valve or something different?

[Hondarally]

Hey Giuls1, no it's a valve inside the master cylinder. Do a bit of a search on Residual pressure valve, or RPD, and it's a fairly common issue with a lot of rear disc brake conversions.

It's designed to keep a little bit of pressure on the brake shoes, so that the return springs don't pull the shoes too far off the drums.

[Giuls1]

Alright thanks. Might just get one of an ek4 or ek sedan just to make sure