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1974 Honda CB550K Front Master Cylinder & Rebuild Parts

Master-cylinder choices for the 1974 Honda CB550K include a Japan-made rebuild kit, complete aftermarket units, reservoir caps and diaphragms, and small rubber service parts. Identify the fitted cylinder and its piston size before treating a replacement assembly as equivalent to the original.

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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 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 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,...
Sold out
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...
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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1974 Honda CB550K · Master Cylinder Buying guide

Identify the fitted cylinder before choosing

A kit reference, reservoir component and complete master cylinder are different orders. The 14mm assembly states its piston size, but its general stock-size wording does not establish the original size for this particular motorcycle.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305 Master cylinder rebuild kitMade in Japan kit replacing OEM 45530-377-305, listed for the 1974-76 CB550K.View part Honda CB Front Master Cylinder Assembly ~ 14mm 14mm front master cylinderBlack-body assembly with silver lever and a stated 14mm piston diameter.View part Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Reservoir diaphragmFront reservoir diaphragm replacing OEM 45520-300-000 for the CB550K.View part

Related parts: Reproduction reservoir cap · Hose-junction rubber boot · Master-cylinder damper set

Piston size needs a specific comparison

The complete assemblies include a 14mm option and a 5/8-inch option. Their stated dimensions identify different choices, but neither a broad fitment list nor general stock-size wording proves equivalence to the cylinder on your bike. Compare the installed size and fittings before ordering.

Caps, diaphragm and boot

The reproduction cap references OEM 45513-341-771 and includes its plastic O-ring. The diaphragm references OEM 45520-300-000, and the boot fits the hose-to-master-cylinder junction. These are separate service parts, so compare the fitted reservoir and connection before choosing what to replace.

Master cylinder questions

Will the Japanese rebuild kit suit a 1974 CB550K?

The Japan-made kit references OEM 45530-377-305 and lists the CB550K from 1974 to 1976. Compare the fitted cylinder with that application; its description does not itemize the kit contents.

Does the 14mm listing verify this bike’s original piston size?

It states a 14mm piston and calls that stock size for most listed motorcycles. That wording does not establish the original size of this specific CB550K, so confirm the fitted cylinder before choosing it.

What does the damper set include?

The master-cylinder damper set contains a rubber damper, plate and washer. Its description includes the CB550K from 1974 to 1976. It is a separate package from the reservoir diaphragm or hose-junction boot.

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