BAJAJ KB4S CALIBER OLD REAR BRAKE DRUM

BAJAJ KB4S CALIBER OLD REAR BRAKE DRUM

Choose the correct rear brake drum for the Bajaj KB4S or older Caliber rear drum-brake motorcycle by comparing the complete original wheel and brake assembly. The drum forms a working friction surface for the brake shoes and must be the correct size and profile. This listing identifies the stated motorcycle model but does not guarantee interchangeability with a different year, brake type or previously modified wheel.

Jump to: Identification | Fitment | Safe checks | FAQs

What a rear brake drum does

On a drum-brake motorcycle wheel, the brake shoes press against the inside of the drum to create controlled stopping friction. The contact surface works with the wheel hub, backing plate, actuating cam and cable or mechanical linkage. The brake system is safety-critical: using the wrong dimensions or allowing movement between parts can reduce braking or damage the wheel.

Normal service requires attention to shoe wear, adjustment, bearings and contamination. Drum condition is only one element. If the lever feels inconsistent or the wheel drags, the cause could be a misadjusted linkage or another worn component. Avoid guessing that replacing the drum will cure every braking symptom.

Model and part identification

• Motorcycle: Bajaj KB4S or older Caliber rear drum-brake motorcycle; fitment depends on the exact rear wheel/brake type.
• Location: Rear wheel drum-brake assembly, not a rear hub or disc-brake rotor.
• Required comparisons: Existing drum inside diameter, depth, axle opening, bearing seats and wheel attachment.
• Brake system: Confirm compatibility with the original brake shoes, panel, cam and operating linkage.
• Quantity and accessory inclusion: One reference drum; do not assume shoes, bearings, spokes, seals, axle or brake panel come with it.
• Unverified properties: Factory OEM approval, a numerical braking rating, exact metal grade and warranty are not established here.

Compare with the removed part

Compare original KB4S or Caliber Old rear wheel drum brake surface, axle/bearings, shoe width, hub depth and wheel or sprocket mounting against the removed part.

This supplier rear drum is for Bajaj KB4S and old Caliber versions. Other Caliber 115 and new model drums have separate source references; no interchange should be assumed. Before replacing a rear brake drum, confirm wheel retention hardware, any final-drive interface, the brake shoe contact width and hub alignment. Never replace a worn rear drum with a similar-looking front component, and seek the exact motorcycle service instructions for assembly checks and roadworthiness.

Measure both the removed drum and the wheel assembly carefully. Confirm the bearing and axle fit, braking contact area, wheel retention and any clearance to the rear suspension or engine case. A drum with the wrong bearing bore, surface diameter or hub width should not be forced into position. The reference product model name alone is not proof of interchangeability.

When buying for a motorcycle that has been restored, fitted with aftermarket wheels or repaired after an impact, the installed wheel can differ from the original model specification. Photograph the mounting surfaces and use the actual part for comparison. If measurements are unavailable, ask a qualified motorcycle mechanic to identify the compatible part before ordering.

Safety inspection and installation checks

If rear braking is weak, noisy or pulsing, check the wheel, brake cam, lining, rod adjustment and bearings. A mechanic should confirm matching geometry before fitting.

Inspect the supplied drum for cracks, deformed edges, corrosion, damage near bearing seats and any marks across the brake contact area. Do not mount a visibly distorted component. The wheel should be supported during inspection, and any bearings or seals reused must be independently assessed for safe condition.

A qualified mechanic should fit the drum with suitable bearings and fasteners, align the brake panel, check wheel rotation and adjust the braking system using the correct vehicle service procedure. Do not improvise brake shoe dimensions or replace a disc-brake system with drum components without a complete, approved vehicle-specific design.

Following assembly, the mechanic should confirm secure axle retention, no unwanted play, reliable brake actuation, normal wheel movement and adequate braking without abnormal noises. Any overheating, binding or unpredictable stopping response requires immediate inspection; do not continue riding with a suspected brake fault.

Find other wheel and braking parts

Review the Autoss rear brake drum category for related drum-brake wheel parts. Each wheel model and braking arrangement should be checked separately; a similar shape or motorcycle name is not sufficient for a safe substitution.

Frequently asked questions about this rear brake drum

Q: Can I use a Caliber 115 rear drum instead?
A: No unverified substitution. The supplier lists Caliber 115 separately and physical wheel specifications must be compared.

Q: Is this a rear drum or a front drum?
A: It is a rear brake drum reference. Front wheel drums and disc rotors are different parts.

Q: Can worn brake shoes be reused with the new drum?
A: Only after a competent mechanic confirms their condition and compatibility. Incorrect shoe dimensions or contamination can affect safe braking.

Q: Can I install it without checking wheel bearings and axle?
A: No. Inspect the related wheel and brake components; improper bearing or axle fit can compromise stability and braking.

Q: Is a factory OEM certificate or warranty included?
A: No unverified OEM, warranty, exact metal composition or certification claim is made for this listing.