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2004 Honda CB900F 919 Master-Cylinder Parts

Check the cylinder and reservoir on your 2004 919 before ordering repair components. The front rebuild kit, rear diaphragm and cap ring serve separate needs. An aftermarket cylinder requires its own application check, even when mounted in the original control position.

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Honda CB750 CB550 CB400F master cylinder diaphragm 45520-300-000

Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000

$10.95 USD
08-0282
Replace a hardened or torn master cylinder diaphragm with this Master Cylinder Reservoir Diaphragm, replacing OEM #45520-300-000. Exceptional range of applications, fits FRONT master...
Honda CB1000 CB900 master cylinder reservoir cap plastic o-ring 45521-MJ6-006

Honda CB Master Cylinder Reservoir Cap Plastic O-Ring ~ Replaces 45521-MJ6-006

$4.95 USD
29-0062
Replace your master cylinder cap O-ring with this Master Cylinder Reservoir Cap Plastic O-Ring, replacing OEM #45521-MJ6-006.Key Features• Master cylinder reservoir cap O-ring• Plastic•...
Honda CB750K CB1000 CB650 front master cylinder kit 45530-MA4-671

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671

$29.95 USD
08-0201
Rebuild your later-model CB's front master cylinder with this Front Master Cylinder Rebuild Kit, replacing OEM #45530-MA4-671. Fits the CB750K (1981-82), CB1000, CB900F (2002-07),...
Magura universal front master cylinder assembly 16mm

Magura Universal Front Master Cylinder Assembly ~ 16mm

$259.00 USD
08-0251
Step up to dual-disk compatibility with this Magura Universal Front Brake Master Cylinder, featuring a 16mm piston diameter recommended for dual-disk brake systems. Threaded...
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2004 Honda CB900F 919 · Master-Cylinder Parts Buying guide

Match each repair component to its cylinder and reservoir

Internal cylinder rebuilding and reservoir-cap repairs need different parts. Match the front kit, rear diaphragm and any cap plate to the actual assembly, particularly after a control conversion.

Parts to consider

Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Rear reservoir diaphragmReplaces 45520-300-000; the listed 919 position is the rear reservoir.View part Honda CB Master Cylinder Reservoir Cap Plastic O-Ring ~ Replaces 45521-MJ6-006 Rear reservoir diaphragm platePlastic part referenced to 45521-MJ6-006; separate from the rubber diaphragm.View part Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA4-671 Front master-cylinder rebuild kitListed for the original-type front cylinder; replaces 45530-MA4-671. Confirm any essential kit contents.View part

Separate the reservoir pieces from the rebuild kit

The front kit replaces 45530-MA4-671; its written listing does not itemize every included piece. Rear diaphragm 45520-300-000 and plastic diaphragm plate 45521-MJ6-006 are separate components. The plastic plate is not the rubber diaphragm, so identify the damaged piece before ordering.

Treat a universal master cylinder as a conversion

The Magura listing specifies a 16 mm piston and recommends dual-disc use, but that alone does not establish 919 suitability. Its brake switch, banjo bolt and sealing washer are sold separately, and it has no mirror mount. Confirm the complete hydraulic and control installation with the supplier or a qualified brake specialist.

Ordering questions

Is the 16 mm Magura a confirmed direct replacement?

No direct-replacement approval is established for this 919. A dual-disc recommendation alone does not confirm hydraulic suitability. Have the exact master cylinder, calipers, hose connections, lever clearance and brake-light switch checked before choosing a conversion.

Does a rebuild kit repair a damaged master-cylinder bore?

The kit listing does not establish that the cylinder is reusable. Have the bore and internal parts inspected under the correct service procedure, and confirm the individual kit contents needed for the repair before ordering.

Can the front rebuild kit also service a Magura cylinder?

Do not assume that. Kit 08-0201 is listed against Honda reference 45530-MA4-671. A fitted Magura needs the service parts for its exact model; a similar bore or motorcycle application is not enough.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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