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1980 Honda CB900C Custom Master Cylinder Parts

Inspect the master cylinder already on your 1980 CB900C Custom before buying internal or reservoir parts. The four-screw front reservoir kit and front repair kit differ from the rear repair kit. An aftermarket assembly may need its own replacement components.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

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Honda CB900 CB750 CB650 front master cylinder assembly

Honda CB900 / CB750 / CB650 Front Master Cylinder Assembly

$109.95 USD
08-0457
Fit a blacked-out front master cylinder to your late-'70s or early-'80s DOHC CB with this Front Brake Master Cylinder Assembly. Usable on any single...
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 CB900 CB750 CB650 CB400 master cylinder reservoir rebuild kit

Honda CB900 / CB750 / CB650 / CB400 Master Cylinder Reservoir Rebuild Kit

$74.95 USD
29-0050
Rebuild your master cylinder reservoir with this Front Master Cylinder Reservoir Rebuild Kit, 4-screw cover type. Includes plastic reservoir, reservoir cap, diaphragm, O-ring, and...
Honda CB750F CB900C front master cylinder kit 45530-422-305

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-422-305

$34.95 USD
08-0210
Service your 1979-80 CB750F or CB900C front master cylinder with this Front Master Cylinder Rebuild Kit, replacing OEM #45530-422-305 / #45530-463-305.Key Features• Front master...
Honda CB750F CB900 rear master cylinder kit 43520-422-305

Honda CB Rear Master Cylinder Rebuild Kit ~ Replaces 43520-422-305

$39.95 USD
08-0213
Service your 1979-80 CB750F or CB900 rear master cylinder with this Rear Master Cylinder Rebuild Kit, replacing OEM #43520-422-305.Key Features• Rear master cylinder rebuild...
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 CB750 CB900 CB650 master cylinder diaphragm 45520-422-026

Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-422-026

$11.50 USD
08-0285
Replace the diaphragm on your early DOHC CB's front master cylinder reservoir with this Front Master Cylinder Reservoir Diaphragm, replacing OEM #45520-422-026 / #45520-422-006...
Honda CB1100 CB1000 CB900 master cylinder rubber boot 45522-422-000

Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-422-000

$8.95 USD
73-0094
Replace your master cylinder rubber boot with this Master Cylinder Rubber Boot, replacing OEM #45522-422-000.Key Features• Master cylinder rubber boot• Replaces OEM #45522-422-000Fitment /...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 45513-341-771

Honda CB Master Cylinder Reservoir Cap ~ Replaces 45513-341-771

$39.95 USD
29-0054
Restore your master cylinder cap with this Master Cylinder Cap with Plastic O-Ring, replacing OEM #45513-341-771. This original style was discontinued long ago by...
Honda CB650 CB750 CB900 replacement brake lever for master cylinder 08-0457

Replacement Brake Lever for Master Cylinder 08-0457

$9.95 USD
08-0018
Replace the brake lever specifically on the #08-0457 Master Cylinder (sold separately) with this Brake Lever.Important: this lever is ONLY for Master Cylinder #08-0457,...
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...
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006

Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006

$23.45 USD
29-0080
Replace your master cylinder reservoir cap with this Master Cylinder Reservoir Cap with Diaphragm, round OEM thread-on type. Cap replaces OEM #43513-MJ6-006, diaphragm replaces...
Honda CB900 CB750 CB650 CB400 chrome master cylinder cover 45513-422-671

Honda CB900 / CB750 / CB650 / CB400 Chrome Master Cylinder Cover ~ Replaces 45513-422-671

$16.95 USD
29-0070
Add chrome to your master cylinder with this Chrome Master Cylinder Cover, 4-screw type, replacing OEM #45513-422-671 / #45519-422-671.Key Features• Chrome master cylinder cover•...
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Honda CB1000C CB900C rear brake light switch spring 35357-MA2-610

1980-83 Honda CB1000C / CB900C Rear Brake Light Switch Spring ~ Replaces 35357-MA2-610

$8.19 $7.87 USD
You save $0.32
73-0849
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring. This is the spring that attaches to the rear...
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1980 Honda CB900C Custom · Master Cylinder Parts Buying guide

Locate the leak and identify the master cylinder

A damaged reservoir, leaking cap and worn internal master-cylinder components require different parts. Check where the fault occurs and whether the installed unit is still the original Honda type.

Parts to consider

Honda CB900 / CB750 / CB650 / CB400 Master Cylinder Reservoir Rebuild Kit Four-screw reservoir kitReservoir, cap, diaphragm, O-ring and screws; reuse the old diaphragm plate.View part Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-422-305 Front master-cylinder kitFront repair kit for the 1980–81 Custom; references 45530-422-305 and 45530-463-305.View part Honda CB Rear Master Cylinder Rebuild Kit ~ Replaces 43520-422-305 1980 rear master-cylinder kitRear repair kit for the 1980 CB900C; reference 43520-422-305.View part

Related parts: Front reservoir diaphragm · Rear reservoir diaphragm

Separate reservoir and internal repairs

The listed front reservoir is the four-screw style. Its kit requires reuse of the original diaphragm plate, so inspect and retain that plate during disassembly. A reservoir kit does not replace the internal piston and seals. A new diaphragm also cannot repair a cracked reservoir or damaged cap sealing surface.

Keep the hydraulic applications distinct

For this year, the front rebuild references are 45530-422-305 or 45530-463-305; the rear reference is 43520-422-305. Match the actual casting and assembly, especially if controls have been changed. Follow the service manual for rebuilding, bleeding and checking full brake release.

Practical questions

Will a reservoir kit cure a soft or sinking lever?

Only if the diagnosed fault is in the reservoir assembly. Air, leaks and internal hydraulic faults need separate checks. Do not assume replacing the cap, plastic reservoir or diaphragm will restore pressure.

Can the Honda rebuild kit be used in an aftermarket master cylinder?

Not from the motorcycle’s model year alone. Identify the installed master cylinder and use its maker’s repair specification; piston and seal dimensions may differ.

What else should I inspect when replacing a leaking diaphragm?

Check the cap, reservoir rim and other sealing parts for cracks or distortion. On the four-screw kit, the original diaphragm plate must be reusable.

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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