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1981 Honda CB900F Master Cylinder Parts

Choose 1981 CB900F master-cylinder parts by the fitted front or rear assembly, not just by reservoir appearance. The range includes separate internal rebuild kits, a two-screw front reservoir package and replacement assemblies. Changed master cylinders need their own lever, switch and hardware checks.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

Honda CB900 CB750 CB650 CB450 master cylinder reservoir rebuild kit

Honda CB Master Cylinder Reservoir Rebuild Kit

$54.95 USD
29-0051
Rebuild your master cylinder reservoir with this Front Master Cylinder Reservoir Rebuild Kit, 2-screw cover type. Includes plastic reservoir, reservoir cap, diaphragm, O-ring, and...
Honda CB750F CB750C CB700SC front master cylinder kit 45530-MA5-671

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA5-671

$24.95 USD
08-0209
Refresh your DOHC CB's front master cylinder with this Front Master Cylinder Rebuild Kit, replacing OEM #45530-MA5-671. Fits the 1981-82 CB750F/C, CB750SC/CB700SC Nighthawk, CB900F/CB900C,...
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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 CB750F CB900 CB1000C rear master cylinder kit 43520-461-771

Honda CB Rear Master Cylinder Rebuild Kit ~ Replaces 43520-461-771

$37.95 USD
08-0212
Rebuild your DOHC CB's rear master cylinder with this Rear Master Cylinder Rebuild Kit, replacing OEM #43520-461-771. Fits the 1981-82 CB750F Supersport, CB900 family,...
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 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 #45522-422-000• Honda...
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 CB750 CB700SC CB650 master cylinder diaphragm 45520-MA5-671

Honda CB Front Master Cylinder Reservoir Diaphragm ~ Replaces 45520-MA5-671

$11.50 USD
08-0284
Replace the diaphragm on your later DOHC CB's front master cylinder reservoir with this Front Master Cylinder Reservoir Diaphragm, replacing OEM #45520-MA5-671 / #45520-MA5-672...
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,...
Honda CB1100 CB900 CB750 chrome master cylinder cover 45513-MA5-671

Honda CB Chrome Master Cylinder Cover ~ Replaces 45513-MA5-671

$22.95 USD
29-0071
Add chrome to your master cylinder with this Chrome Master Cylinder Cover, 2-screw type, replacing OEM #45513-MA5-671 / #45513-413-941.Key Features• Chrome master cylinder cover•...
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 CB1100F CB900F CB750F rear brake light switch spring 35357-KE4-730

1979-83 Honda CB1100F / CB900F / CB750F Rear Brake Light Switch Spring ~ Replaces 35357-KE4-730

$5.80 USD
73-1007
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring. This is the spring that attaches to the rear...
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...
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1981 Honda CB900F Supersport · Master Cylinders Buying guide

Find the leak and inspect the cylinder bore

Fluid around a reservoir, a leaking piston seal and a damaged cylinder bore require different repairs. Check where the leak starts and identify the front or rear assembly before choosing reservoir parts, an internal kit or a replacement master cylinder.

Master-cylinder service choices

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-MA5-671 Front internal rebuild kitReplacement reference 45530-MA5-671.View part Honda CB Rear Master Cylinder Rebuild Kit ~ Replaces 43520-461-771 Rear internal rebuild kitReplacement reference 43520-461-771.View part Honda CB Master Cylinder Reservoir Rebuild Kit Front reservoir repair kitPlastic reservoir, cap, diaphragm, O-ring and screw.View part

Related parts: Black replacement front master cylinder · Rear reservoir diaphragm

Keep reservoir repairs separate from internal repairs

The two-screw front reservoir kit contains the plastic reservoir, cap, diaphragm, O-ring and screw. It does not replace the internal front master-cylinder kit. The rear internal kit has a separate reference, 43520-461-771. Trace the fault before ordering both kinds of repair.

Identify an aftermarket master cylinder before ordering its parts

Assembly 08-0457 has a 15.8mm bore, black lever and a brake-light switch with two small spade terminals. Its dedicated replacement lever does not fit stock master cylinders. The universal Magura assembly has different service parts, so neither its rebuild kit nor a stock-pattern lever should be chosen just from the motorcycle year.

Ordering questions

Can reservoir parts repair a leaking or worn piston seal?

No. A cap, diaphragm or reservoir seal repairs its own joint; the internal piston and seals are a different job. Inspect the cylinder bore and passages before rebuilding. Bad corrosion or scoring can make an internal kit unsuitable.

Is handlebar fit enough to choose a replacement master cylinder?

No. Match the bore to the brake configuration and required lever travel, then check the hose connection, lever, switch and mounting. The 15.8mm replacement assembly’s single- or dual-disc description does not establish compatibility with every modified system.

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