VintageCB750 Supplying CB Riders Since 2010

About Us Why Us? Reviews Shipping Info Returns Contact Us
Wish Lists
0 My Cart

Your cart is currently empty.

Browse all parts
Total (USD): $0.00
View cart
Menu
Search
Wish
Cart 0
My motorcycle Choose your Honda CB model

Search parts

Searching all Honda CB parts

Example: brake pads or oil filter.

1971 Honda CB500K Front Master Cylinder Parts

Compare the master cylinder fitted to your 1971 CB500K before choosing internal rebuild parts or a replacement assembly. The catalog includes different piston sizes and separate reservoir components, so a year match alone should not decide which parts suit an altered system.

Close ×
Your saved bike Choose your Honda CB model

Shop By Category

Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Master Cylinder & Rebuild Parts

Honda motorcycle parts

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

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...
compare

1971 Honda CB500K · Master Cylinder Parts Buying guide

Match the installed master cylinder before buying

Internal service parts, reservoir diaphragm and cap are distinct items. A complete assembly is a different purchase again, and the listed 14mm, 5/8-inch and universal options should not be treated as mechanically identical choices.

Parts to consider

Honda CB Front Master Cylinder Rebuild Kit ~ Replaces 45530-377-305 Front master cylinder rebuild kitJapanese-made internal service kit replacing Honda reference 45530-377-305.View part Honda CB Front Master Cylinder Assembly ~ 14mm 14mm master cylinder assemblyListed with a 14mm piston, black body and silver lever; confirm your installed size.View part Honda CB Master Cylinder Reservoir Diaphragm ~ Replaces 45520-300-000 Reservoir diaphragmSeparate front-reservoir diaphragm replacing Honda reference 45520-300-000.View part

Related parts: Reservoir cap with plastic O-ring

Decide whether to repair or replace the unit

A rebuild kit is intended for a compatible master cylinder; it is not a new housing or lever assembly. Check the installed unit and its condition before selecting internal parts. The assembly listings provide alternatives, but their piston sizes must be compared with the system being retained.

Order reservoir parts by function

The diaphragm, cap and cap O-ring are separate types of reservoir component. The selected reproduction cap explicitly includes a plastic O-ring. That inclusion does not establish that a diaphragm or internal rebuild kit comes with it, so check each item against the parts already on the motorcycle.

Common questions

What must match before choosing the internal kit or 14 mm assembly?

The rebuild kit references 45530-377-305 for a compatible existing front cylinder. The separate assembly specifies a 14 mm piston. Identify the installed cylinder and piston size first; broad model fitment does not confirm an altered hydraulic setup.

Which reservoir parts arrive with the reproduction cap?

The cap references 45513-341-771 and includes its plastic O-ring. The rubber diaphragm is a separate item under 45520-300-000. Compare those references and the installed reservoir, particularly if a previous owner replaced the master-cylinder assembly.

Does the 14 mm listing establish my bike’s original bore?

It specifies the replacement assembly’s piston size, while its stock-size wording is qualified across several models. The source asks buyers to confirm the original size. Match the fitted cylinder and brake system instead of assuming every 1971 CB500K retains matching equipment.

Not sure which part you need?

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

Ask a fitment question
Parts categories for 1971 Honda CB500K Four

Your cart

×