Catalog

SHAANXI 81501100232 DRUM BRAKE

SHAANXI 81501100232 DRUM BRAKE

Product Specifications

Product quality
OEM Equivalent Grade
starstarstar
Wholesale price USD $41.15
Wholesale price CNY ¥279.6
bolt MOQ (Minimal order)
40 pcs
local_shipping Production time
30-45 days
package_2 Shipping Weight: 40 kg
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SHAANXI 81501100232
Overview & Operating Principle
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The DRUM BRAKE is a cast iron rotating friction surface that encloses the brake shoes and wheel cylinder on rear axle drum brake systems. When the brake pedal is depressed, hydraulic pressure forces the wheel cylinder pistons outward, pressing the curved brake shoe friction lining against the inner diameter of the drum — the friction between the lining and the drum surface converts kinetic energy into heat, decelerating the vehicle. The self-energising geometry of leading-trailing and twin-leading shoe arrangements amplifies braking force mechanically, making drum brakes well-suited to rear axle parking brake integration, where the shoe mechanism doubles as the handbrake actuator.

This unit — SHAANXI 81501100232 — is manufactured to OEM-equivalent specifications: internal diameter, maximum rebore diameter, drum width, hat section pilot diameter, wheel stud bolt circle diameter, and cast iron grade are matched to the original part. Supplied as a direct bolt-on replacement for standard fitment. Available wholesale from 41.15 USD, MOQ 40 pcs, production lead time 30-45 days.

Brake drums wear through friction surface erosion and thermal distortion from repeated heat cycling. The critical limit is maximum internal diameter — stamped on the drum exterior or specified in the vehicle service manual. A drum worn beyond maximum diameter has insufficient wall thickness to absorb braking energy safely and is prone to cracking under heavy load. Always measure drum diameter at multiple points around the circumference with an internal drum micrometer before deciding to reuse or replace — out-of-round drums cause pedal pulsation identical to warped disc rotors and must be replaced regardless of wall thickness.

Symptoms & Diagnostics
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Brake pedal pulsation or rhythmic grabbing during light braking — indicates drum out-of-round caused by uneven wear or thermal distortion; the shoes contact high spots on each rotation, creating a cyclic variation in braking force.
Scraping or grinding noise from the rear during braking — brake shoe friction material worn to the metal backing plate, scoring the drum surface directly; a scored drum cannot be reused as shoe contact area is compromised.
Vehicle pulling to one side under braking — uneven drum wear or a seized wheel cylinder on one side causing asymmetric braking force between left and right rear wheels.
Reduced handbrake holding force requiring excessive lever travel — a drum worn beyond maximum diameter increases the gap between shoe and drum surface, requiring the self-adjuster to extend beyond its range before the shoe contacts the drum.
Visible heat cracks, deep scoring, or blue discolouration on the drum friction surface on inspection — heat cracks indicate thermal fatigue from repeated heavy braking; a cracked drum must be replaced immediately as fracture propagation under load is a safety-critical failure mode.
Drum internal diameter measured beyond the maximum wear limit stamped on the exterior — replace immediately regardless of surface appearance; a drum at maximum diameter has no remaining safety margin for thermal expansion under emergency braking conditions.
Logistics & Customs
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International HS Code
8708.30
EAEU Customs Code (TN VED)
8708 30 910 0
Typical Net Weight
40.0 kg
Country of Manufacture
China
Standard MOQ
40 pcs
Production Lead Time
30-45 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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  1. Release the handbrake fully and loosen the rear wheel nuts before raising the vehicle. On vehicles with a drum-integrated handbrake adjuster, back off the self-adjuster fully through the inspection hole in the drum or backing plate before attempting drum removal — a fully expanded adjuster is the most common reason a drum cannot be pulled free.
  2. Remove the drum by pulling it straight off the hub. If seized by corrosion between the drum hat and hub face, fit two M8 bolts into the drum puller holes (where present) and tighten evenly, or tap the hat section with a rubber mallet — never strike the friction surface or apply heat near the wheel bearing.
  3. Inspect the brake shoes, wheel cylinder, and hardware before fitting the new drum. A new drum fitted against worn shoes with glazed or contaminated friction material will not bed in correctly and will produce noise and reduced braking performance. Replace shoes if lining thickness is below 2 mm or if oil or brake fluid contamination is present.
  4. Clean the hub mounting face thoroughly with a wire brush and rust remover. Corrosion or debris on the hub face causes drum runout and pedal pulsation on new installations — the same root cause as with disc brake rotors. Apply a thin film of copper-based anti-seize compound to the hub pilot only, keeping it away from the friction surface.
  5. Check the self-adjuster mechanism for free movement and correct operation before fitting the new drum. A seized adjuster will prevent correct shoe-to-drum clearance after installation, causing excessive pedal travel or shoe drag. Lubricate adjuster threads with high-temperature brake grease.
  6. Install the new DRUM BRAKE (SHAANXI 81501100232), refit the wheel, and adjust the handbrake cable and self-adjuster so the drum rotates freely with light resistance — pump the brake pedal 10–15 times to allow the self-adjuster to set correct shoe-to-drum clearance, then road-test and confirm pedal feel, straight-line braking, and handbrake holding force before returning the vehicle to service.
Tools: internal drum micrometer, wire brush, rubber mallet, drum puller, brake adjuster tool, high-temperature brake grease, copper anti-seize compound, brake cleaner.
Frequently Asked Questions
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Must brake drums be replaced in pairs, or can a single drum be replaced?
Always replace brake drums in axle pairs — both left and right rear simultaneously. A new drum paired with a worn drum on the opposite wheel will produce uneven rear braking force, causing the vehicle to pull under braking and creating instability under heavy loads. ok.parts supplies drums individually and in axle-pair sets at wholesale MOQ from 41.15 USD per unit.
Is a bedding-in procedure required after fitting new brake drums?
Yes. New drums must be bedded in with new brake shoes to establish full contact across the shoe arc. Perform 8–10 moderate stops from 50 km/h with 30-second cooling intervals between each stop, using only light to moderate pedal force. Avoid heavy or emergency braking for the first 200 km. The self-adjuster will automatically set the correct clearance during the first few brake applications — recheck handbrake cable adjustment after the bedding-in period as shoe seating changes the effective travel.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
PartReason for Combined Replacement
Brake Shoes
OEM ref. varies by axle		New drums must always be paired with new brake shoes. Worn shoes have an uneven arc profile that prevents correct bedding-in against a new drum surface, causes uneven contact and noise, and accelerates drum wear. Never fit new drums against old shoes — the combination produces reduced braking efficiency and rapid drum scoring.
Wheel Cylinder
OEM ref. varies by application		A leaking wheel cylinder contaminates the brake shoe friction material with brake fluid, causing glazing and severely reduced braking force. If any fluid contamination is found inside the drum on removal, the wheel cylinder must be replaced simultaneously — fitting new shoes and a drum without addressing the leak source will result in immediate contamination of the new components.
Brake Drum Hardware Kit
Springs, adjuster, retaining pins		Return springs, hold-down springs, and self-adjuster components fatigue and corrode over the drum service life. Weak return springs cause shoe drag against the new drum, producing premature wear and heat buildup. Replace the full hardware kit when fitting new drums and shoes to restore correct shoe retraction and adjuster function.