Brake Wheel Cylinder / Caliper Assembly 8092859690 8-09285969-0 For ISUZU TFR54 4JA1 — OEM-Spec Aftermarket, 6-Month Warranty

The Brake Wheel Cylinder / Caliper Assembly with references 8092859690 / 8-09285969-0 is a verified replacement brake component for the ISUZU TFR54 pickup equipped with the 4JA1 (2.5L diesel) engine, with cross-application coverage extending to TFR15 and D-MAX variants. This assembly is a hydraulic brake actuator at the wheel end of the braking system — it receives hydraulic pressure from the master cylinder and converts it into mechanical force that applies the brake shoes (drum system) or pads (disc system) to slow or stop the vehicle.

The part carries a reference actual size of 20 × 10 × 13 cm (per yimi) or 23 × 14.5 × 7.5 cm (per Italian supplier), with a packaging size of 24 × 16 × 11 cm and a 6-month quality guarantee. It is supplied as an OEM-specification aftermarket component under the "CHINA AFTERMAKET" brand designation. The associated references 350122006, 8970653500, and 8943880160 are grouped with this part number in caliper assembly contexts across multiple catalogs.

• Part Number & Factory Reference Verified: 8092859690 is confirmed as the primary reference, with 8-09285969-PT (yimi) and 8-09285969-0 (Italian supplier) as factory/tooling references.
• Vehicle & Engine Coverage Verified: ISUZU TFR54, engine 4JA1 (2.5L diesel) — confirmed across yimi (Korean, French, Swedish, Bengali portals), Italian Ecer, Persian, and Turkish supplier catalogs. TFR15 and D-MAX cross-coverage is referenced by Persian and Italian sources.
• Supplier-Listed Classification Verified: "Brake Wheel Cylinder" (yimi) vs. "Brake Caliper Assembly / CALIPER SUB ASSY; R" (Turkish, Italian, Persian) — both classifications are documented, confirming the terminology ambiguity.
• Dimensions Verified: Actual size 20 × 10 × 13 cm (yimi) and 23 × 14.5 × 7.5 cm (Italian supplier); packaging size 24 × 16 × 11 cm (Italian supplier) — the dimensional discrepancy between suppliers further supports the possibility of different physical configurations.
• Warranty Verified: 6 months (yimi, Italian) / 3 months (Persian) — confirm tier at inquiry.
• Cross-Reference Group Verified: 350122006, 8970653500, 8943880160 are grouped with 8092859690 in caliper assembly listings (Turkish/Polish catalogs), providing alternative sourcing leads.
• Piston Diameter / Bore Size NOT Publicly Disclosed for This Exact Reference: Public listings for 8092859690 do not publish a piston bore diameter. Related TFR54/TFR rear wheel cylinders show Ø 23.8mm, Ø25mm, and Ø25.4mm variants across different references — confirm the bore against the original unit if a drum-brake wheel cylinder is required.

• Brake fluid leak at the wheel: Visible wetness around the backing plate (drum) or caliper body (disc) — indicates seal failure and imminent braking loss.
• Spongy or long-travel brake pedal: Pedal sinks further than normal and feels soft — air enters the system through a failed seal, reducing hydraulic pressure.
• Uneven braking or vehicle pull: Vehicle pulls to one side during braking — one actuator is not applying equal force, causing imbalance.
• Brake drag / overheating wheel: A seized wheel cylinder piston or caliper piston keeps the brake applied, generating excessive heat and a burning smell.
• Brake warning light illumination: Dashboard brake warning activates, often accompanied by abnormal brake behavior — inspect immediately.
• Visible corrosion or pitting on the piston or bore: Direct inspection reveals surface degradation that prevents proper sealing and retraction.

• Brake type is the first and most critical check: This part is listed as both a wheel cylinder and a caliper assembly across different supplier catalogs. Physically verify whether the vehicle uses drum or disc rear brakes before ordering. A wheel cylinder cannot be installed on a disc-brake caliper mount, and vice versa.
• Position: The TFR54 context suggests a rear brake actuator, but confirm front vs. rear against the original unit. Front and rear actuators have different bore sizes and mounting configurations.
• Piston diameter must be confirmed for drum applications: If the vehicle is drum-brake equipped, related TFR54/TFR rear wheel cylinders show Ø 23.8mm, Ø25mm, and Ø25.4mm variants. Measure the original wheel cylinder bore or provide the original part number to ensure the correct hydraulic ratio.
• 8092859690 vs. 8092859700: The Turkish catalog lists 8092859700 as a separate "Brake caliper assembly" reference. These are digitally similar but distinct references — do not assume interchangeability without physical verification.
• Genuine vs. aftermarket: This part is supplied as OEM-specification aftermarket (CHINA AFTERMAKET brand, 6-month warranty). Confirm the buyer's requirement for OEM authenticity versus cost-effective aftermarket supply.

1. 1Confirm the required part first: Verify whether the vehicle uses drum or disc rear brakes, and confirm whether the required part is for the front or rear position. Compare the physical form of the original unit to the replacement.
2. 2Safety first: Park on level ground, engage the parking brake, and chock the wheels. Wear safety glasses and gloves.
3. 3Remove the wheel and brake assembly: For drum brakes, remove the drum; for disc brakes, remove the caliper. Inspect the brake shoes/pads and disc/drum for wear.
4. 4Disconnect the hydraulic line: Place a drain pan underneath, disconnect the brake line, and plug the line immediately to prevent contamination.
5. 5Remove the old unit: Unbolt the wheel cylinder or caliper from the backing plate/knuckle. Note the orientation and any mounting hardware.
6. 6Install the new unit: Position the replacement, reconnect the hydraulic line, and torque the mounting bolts to the workshop manual specification.
7. 7Bleed the brake system: Fill the reservoir with DOT 3 or DOT 4 fluid and bleed until clear, bubble-free fluid flows from the bleeder screw.
8. 8Test operation: Verify firm pedal feel and check for leaks. Road-test at low speed before returning the vehicle to service.

• Standard packing: Neutral carton or customer-requested packaging. Packaging size reference: 24 × 16 × 11 cm.
• Package contents: 1 × Brake Wheel Cylinder / Caliper Assembly. Bleeder screw, mounting hardware, and brake fluid are not included unless explicitly stated — confirm exact package contents at inquiry.
• Set options: Single unit / left + right pair (if applicable) — specify at inquiry.
• Suitable for: ISUZU TFR54 brake system repair shops, light commercial fleet maintenance departments, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
• Related parts available: Brake shoes (drum), brake pads (disc), brake drums/discs, wheel cylinder repair kits, brake fluid, and complete TFR54 brake system service kits.