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1973 Honda CB750K Master Cylinder & Rebuild Parts

A master cylinder kit must match the assembly on the motorcycle. This 1973 Honda CB750K selection includes rebuild parts, replacement assemblies and reservoir or hose-junction rubber pieces. Identify whether your bike retains its original-style unit or has a later replacement before ordering.

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Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

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Honda CB750 CB550 CB400F front master cylinder kit 45530-377-305

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305

$37.95 USD
08-0215
Rebuild your early SOHC CB's front master cylinder with this Front Brake Master Cylinder Rebuild Kit, replacing OEM #45530-377-305. Made in Japan. Fits the...
Honda CB750 CB550 CB500 master cylinder rubber boot 45522-300-010

Honda CB Master Cylinder Rubber Boot ~ Replaces 45522-300-010

$9.95 USD
33-0003
Replace your master cylinder rubber boot with this Master Cylinder Rubber Boot, which attaches where the brake hose joins the master cylinder. Replaces OEM...
New
Honda CB750 CB550 CB400F front master cylinder assembly 5 8 in.

Honda CB Front Master Cylinder Assembly ~ 5/8 in.

$99.95 USD
08-0253
Drop in a factory-look master cylinder with a performance piston size using this Front Brake Master Cylinder Assembly. Black body with silver lever, custom-manufactured...
Honda CB750K rear brake light switch spring 35357-300-000

1969-76 Honda CB750K Rear Brake Light Switch Spring ~ Replaces 35357-300-000

$5.95 USD
29-7009
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring, replacing OEM #35357-300-000.Key Features• Rear brake light stop switch...
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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 CB750 CB550 CB500 CB400 CB350 master cylinder damper set

Honda CB Master Cylinder Damper Set

$6.95 USD
73-0841
Replace your master cylinder damper with this Master Cylinder Damper Set. Includes brake master cylinder rubber damper, plate, and washer. This set is often...
New
Honda CB750 CB550 CB400F front master cylinder assembly 14mm

Honda CB Front Master Cylinder Assembly ~ 14mm

$99.95 USD
08-0269
Restore strong and consistent braking performance with this Front Brake Master Cylinder Assembly, designed as a high-quality replacement for many classic Honda models. This...
Honda CB750K rear brake light switch bracket 50156-300-020

1969-76 Honda CB750K Rear Brake Light Switch Bracket ~ Replaces 50156-300-020

$13.95 USD
73-0887
Replace your rear brake stop switch bracket with this Rear Brake Light Stop Switch Bracket, replacing OEM #50156-300-020.Key Features• Rear brake light stop switch...
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 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...
Universal Honda-type front master cylinder assembly 13mm

Universal Honda-Type Front Master Cylinder Assembly ~ 13mm

$84.95 USD
08-0262
Upgrade to a universal front master cylinder assembly with this Honda-type unit. Complete with lever, banjo bolt, banjo bolt washers, and brake light switch,...
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Honda CB750 CB650 CB550 replacement brake lever for master cylinder

Honda CB Replacement Brake Lever for Master Cylinder 08-0262

$9.95 USD
08-0430
Replace the brake lever on the #08-0262 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder.Key Features• Replacement brake...
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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Honda CB750K brake hose master cylinder boot

1973-74 Honda CB750K Brake Hose/ Master Cylinder Boot

$4.61 USD
08-3007
Replace the rubber boot at the brake hose / master cylinder junction with this Brake Hose / Master Cylinder Boot. Fits the 1973-74 CB750K,...
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Honda CB750 replacement brake lever for master cylinder 08-0253

Replacement Brake Lever for Master Cylinder 08-0253

$9.95 USD
08-0029
Replace the brake lever on the #08-0253 Master Cylinder Assembly specifically with this Brake Lever. Designed for this particular master cylinder, not stock brake...
Magura universal front master cylinder assembly 13mm

Magura Universal Front Master Cylinder Assembly ~ 13mm

$259.00 USD
08-0250
Build a custom front brake setup with this Magura Universal Front Brake Master Cylinder. Features a 13mm piston diameter, 12mm stroke, and a threaded...
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1973 Honda CB750K · Master Cylinder & Rebuild Parts Buying guide

Match the rebuild parts to the actual master cylinder

A complete replacement assembly, internal rebuild kit and reservoir diaphragm are separate choices. Start with the fitted unit identification, then compare the listing references and the exact rubber or hardware piece needed.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305 Front Master Cylinder Rebuild KitKit listed for the early CB750K front master cylinder; replaces reference 45530-377-305.View part Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Reservoir DiaphragmFront reservoir diaphragm listed for the CB750K; replaces reference 45520-300-000.View part 1973-74 Honda CB750K Brake Hose/ Master Cylinder Boot Brake Hose Junction BootRubber boot listed for the 1973–74 CB750K at the brake hose-to-master-cylinder junction.View part

Related parts: Rubber boot, reference 45522-300-010

Separate internal rebuilding from reservoir service

The reservoir diaphragm is reference 45520-300-000; the hose-junction boot is a different location. The 1973–74-specific boot and reference 45522-300-010 are separate choices. Compare the fitted unit and rubber shape rather than assuming identical parts from overlapping model applications.

Replacement assemblies need their own checks

The offered replacement assemblies include a 14 mm piston option and a 5/8-inch piston option. These are specifications of the replacement units, not proof of your original bore. Identify the installed assembly before choosing its rebuild kit or replacement lever.

Common questions

Will the featured rebuild kit fit every replacement master cylinder?

The kit is specified under reference 45530-377-305. That application does not establish fit for every later replacement cylinder. Identify the fitted assembly and its required service parts before ordering.

Do the two stock-look replacement cylinders have the same piston size?

The silver-lever replacements include separate 14 mm and 5/8-inch piston options. Match the required assembly and brake arrangement rather than treating a similar external appearance as proof of the same internal parts.

Does the replacement reservoir cap supply its plastic O-ring?

The reproduction cap referencing 45513-341-771 includes a plastic O-ring. It is expressly paired with the offered silver-lever replacement master cylinders. Check the cap and retained reservoir before adding a separate O-ring.

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