CMS-Japanese Motorcycle Supply Parts

Disassembling the rear master cylinder - Honda CX500 Sports, CX650ED Eurosport, CX500 Turbo, CX650 Turbo

Before using this site please read the site disclaimer. Also please note that any links provided may be part of an affiliate programme (viz. eBay, Amazon) which helps support the site as I will earn a commission when visitors make a qualifying purchase.

As part of our series on rebuilding the rear master cylinder for the rear-disc-brake equipped CX bikes - CX500EC Sports, CX650ED Eurosport, CX500 Turbo and CX650 Turbo - we are looking at disassembling a unit today:

Taking a closer look, we can see the bore diameter on one side - 14mm:

There's an actuating rod that connects the brake lever to the master cylinder - here looking rather rusty:

Here's the end that connects to the brake lever:

Heading around to the other side, we have on this one "17A1":

Attaching the master cylinder to the reservoir, we have two (rusty) screws:

Looking closely, there's a dot on the screw heads - which suggests it's a JIS screw, as far as I'm aware:


When lifting the plastic 90-degree bend away green fluid leaked out... probably long overdue for a change:

There's an O-ring - size pending:

Looking in:

Looking back at the wider picture again now that we have removed the reservoir tube:

The rubber boot should pull back easily:

The rubber boot should slide down the rod:

...which allows you to see the circlip holding the assembly together:

Continued in part two!

Search MotoFaction:

Follow us on Facebook!

Follow us on Instagram!

CMS-Japanese Motorcycle Supply Parts

Search MotoFaction:

In 2019 the server has had to double in capacity to support the growing site... please consider dropping the site a donation to help cover the costs! Check out our Patreon for support options, buy a shirt, buy our apps, use my NordVPN affiliate link to sign up to their service or donate via Paypal:

Paypal $5 link ->>
Paypal $10 link ->>