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1973 Honda CB500K Front Caliper Service Components

Before ordering caliper service parts for a 1973 Honda CB500K, inspect the piston, seal groove, pivot and bleed screw individually. The replacement piston, hydraulic seal and adjuster package address different parts of the assembly. Their separate listings should not be read as one complete rebuild kit.

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Currently viewing Brake Caliper Rebuild Kits, Caliper Pistons, Bleed Screws

Honda motorcycle parts

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

Honda CB900 CB750 CB650 caliper piston sealing ring 45108-300-003

Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003

$7.95 USD
29-0527
Replace your front caliper piston sealing ring with this Front Brake Caliper Piston Sealing Ring, replacing OEM #45108-300-003. Also fits the rear brake caliper...
Honda CB750 CB550 front brake caliper bleed screw rubber cap 45110-300-003

Honda CB Front Brake Caliper Bleed Screw Rubber Cap (Stock Type) ~ Replaces 45110-300-003

$3.95 USD
29-7018
Replace your front caliper bleed screw rubber cap with this Stock Type Front Brake Caliper Bleed Screw Rubber Cap, the same design as the...
Honda CB750 CB550 CB500 CB450 front caliper adjuster set 45117-341-700

Honda CB750 / CB550 / CB500 / CB450 Front Caliper Adjuster Set ~ Replaces 45117-341-700

$13.95 USD
29-7016
Restore your front caliper adjuster with this Front Brake Caliper Adjuster Set, including adjusting bolt, spring, washer, and nut. Replaces OEM #45117-341-700 (bolt), #45119-300-020...
Honda CB750 CB550 CB500 front brake caliper bleed screw 45224-579-013

Honda CB Front Brake Caliper Bleed Screw ~ Replaces 45224-579-013

$8.95 USD
73-0993
Replace your front caliper bleed screw with this Front Brake Caliper Bleed Screw, replacing OEM #45224-579-013.Key Features• Front brake caliper bleed screw• Replaces OEM...
Honda CB1100 CB1000 caliper bleed cap (pk 10) 45108-425-003

Honda CB Caliper Bleed Screw Rubber Cap (Pk/10) ~ Replaces 45108-425-003

$11.95 USD
29-0500
Stock up on caliper bleed screw rubber caps with this Brake Caliper Bleed Screw Rubber Cap 10-pack. Universal type for series 1, 3, 4,...
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Honda CB550 CB500 CB450 CB400 CB360 front caliper piston 45107-323-020

Honda CB Front Caliper Piston ~ Replaces 45107-323-020

$21.78 USD
29-0058
Replace your front brake caliper piston with this Front Brake Caliper Piston, 38.15mm diameter x 34mm height, replacing OEM #45107-323-020. The side with the...
Honda CB750 CB550 front brake caliper bolt and washer set 90165-323-000

Honda CB Front Brake Caliper Bolt & Washer Set ~ Replaces 90165-323-000

$12.50 USD
73-1027
Replace your front caliper bolts and washers with this Front Brake Caliper Bolt & Washer Set. Includes 2 bolts and 2 washers. Replaces OEM...
Honda CB550 CB500 CB450 front brake caliper assembly 45100-390-405

Honda CB Front Brake Caliper Assembly ~ Replaces Honda OEM 45100-390-405

$119.95 USD
33-0039
Replace a worn, seized, damaged, or missing front brake caliper with this aftermarket full caliper assembly for Honda CB models. It is a replacement...
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1973 Honda CB500K · Caliper Service Buying guide

Identify pressure-sealing parts and adjustment hardware

A 38.15 x 34 mm piston references Honda 45107-323-020, and its separate hydraulic ring references 45108-300-003. The adjuster package contains mechanical adjustment hardware. Compare those references with the fitted caliper, particularly if the brake assembly has been changed.

Parts to consider

Honda CB Front Caliper Piston ~ Replaces 45107-323-020 38.15 x 34 mm replacement pistonOne piston references 45107-323-020; the source specifies that its 2 mm outer-lip side faces the brake pad.View part Honda CB Caliper Piston Sealing Ring ~ Replaces 45108-300-003 Separate hydraulic piston ringOne pressure seal references Honda 45108-300-003 for the compatible piston bore. It is different from an external dust boot.View part Honda CB750 / CB550 / CB500 / CB450 Front Caliper Adjuster Set ~ Replaces 45117-341-700 Four-piece pivot adjustment hardwareThe four named adjustment parts service the compatible pivoting caliper arrangement; this package does not supply the piston or pads.View part

Related parts: Bleed screw referenced to 45224-579-013

Treat each sealing surface as part of the repair

The piston and hydraulic ring are separately supplied. Inspect the bore, groove and piston surface before choosing them; new parts do not correct a damaged seating surface. The bleed screw also depends on its matching thread and conical seat, so identify the caliper instead of choosing a similar-looking screw.

Keep the adjuster package distinct from a hydraulic rebuild

The adjuster listing names a bolt, spring, washer and nut. Those parts provide mechanical adjustment and retention, while the piston ring contains hydraulic pressure. Decide which components require replacement and use the Honda procedure for adjustment and final brake checks.

Common questions

Which replacement piston specification should I compare with the existing caliper?

The piston is 38.15 mm in diameter and 34 mm high under reference 45107-323-020. Its 2 mm outer-lip side faces the pad. Compare the application and retained caliper as well as dimensions, especially if a different assembly has been fitted.

What identifies the separately ordered hydraulic piston ring?

It references Honda 45108-300-003 and supplies one pressure seal per compatible piston bore. The source distinguishes it from an external dust boot. Compare the bore and seal groove when ordering with the separately listed piston, rather than choosing an exposed cover.

What references distinguish adjuster hardware from the bleed screw?

The adjuster package names bolt 45117-341-700, spring 45119-300-020, washer and nut. The separate bleed screw references 45224-579-013. Match the caliper application, and compare the bleed screw’s thread and sealing seat when that item also needs replacement.

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