Front Left Brake Caliper Assembly 8092859700 8-09285970-0 For ISUZU TFR54 D-MAX TFR UCR (4JA1) — Twin-Piston, OEM-Spec Aftermarket, 6-Month Warranty

The Front Left Brake Caliper Assembly with OEM references 8092859700 / 8-09285970-0 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 D-MAX and TFR UCR variants. This is the front left-hand (LH) hydraulic clamping unit that straddles the front brake disc and converts hydraulic pressure from the master cylinder into mechanical force, driving the brake pads against the rotor to decelerate or stop the vehicle.

The caliper is confirmed as a twin-piston (two-piston) design — Turkish-market parts catalogs describe it as "FREN KALIPER TM.TK.PISTONLU", where "PISTONLU" indicates a piston-type caliper and "TM.TK" likely denotes a complete/twin configuration. The product name in the factory data is "CALIPER SUB ASSY;L", confirming the left-side designation. It is supplied as an OEM-specification aftermarket component under the "CHINA AFTERMAKET" brand, with a 6-month quality guarantee and actual dimensions of 23 × 14.5 × 7.5 cm (packaging: 24 × 16 × 11 cm).

• Part Type & Position Verified: "CALIPER SUB ASSY;L" — confirmed by German (Yimi/Ecer), Italian (Yimi/Ecer), and Russian (isuzuautospareparts.com) factory data, explicitly designating a left-side caliper sub-assembly.
• Function Description Verified: The caliper's function is confirmed as converting master cylinder hydraulic pressure into mechanical force to clamp the brake pads against the disc — verified by German, Italian, and Turkish supplier descriptions.
• Twin-Piston Configuration Verified: "PISTONLU" (piston-type) — confirmed by Turkish-market catalog listing for the TFR54 front caliper.
• Vehicle & Engine Coverage Verified: ISUZU TFR54 with 4JA1 (2.5L diesel) — confirmed across German, Italian, Russian, and Turkish catalogs. D-MAX and TFR UCR cross-coverage is referenced by Russian and Hindi supplier listings.
• Dimensions Verified: Actual size 23 × 14.5 × 7.5 cm; packaging size 24 × 16 × 11 cm — confirmed by German and Italian Yimi/Ecer factory data.
• Warranty & Brand Verified: 6-month quality guarantee; CHINA AFTERMAKET brand — confirmed by Yimi/Ecer supplier data.
• Cross-Reference Group Verified: 350112005A, 350112006, 8943880170, 8970653510 are consistently grouped with 8092859700 in TFR54 front caliper assembly contexts across multiple catalogs.

• Brake fluid leak at the caliper body or piston seal: Visible wetness or drips around the caliper, often accompanied by a low brake fluid level — indicates a failed piston seal or corroded piston bore.
• Uneven or accelerated brake pad wear: A sticking caliper piston or seized guide pin causes one pad to wear faster than the other, or the inner pad to wear prematurely.
• Vehicle pulls to one side during braking: A seized or dragging caliper on one side applies uneven braking force, causing the vehicle to pull toward the affected side.
• Brake drag / overheating wheel: A caliper that does not release fully keeps the brake pads in contact with the disc, generating excessive heat, a burning smell, and potential wheel bearing damage.
• Spongy or long-travel brake pedal: Air entering the system through a failed caliper seal reduces hydraulic pressure and produces a soft pedal.
• Visible corrosion or pitting on the piston or caliper bore: Direct inspection during pad replacement reveals surface degradation that prevents proper sealing and piston retraction.

• Brake type is the first and most critical check: This part is a disc-brake caliper, not a drum-brake wheel cylinder. Physically verify whether the vehicle uses disc or drum front brakes before ordering. A caliper cannot be installed on a drum-brake backing plate, and vice versa.
• Left vs. Right: This is the front left (LH) caliper. The front right (RH) uses a different reference. Do not interchange left and right — the caliper body, bleed screw location, and hose fitting orientation differ.
• Piston diameter must be confirmed: Public data does not specify the piston bore for this exact reference. Measure the original caliper's piston diameter or provide the original part number to ensure the correct hydraulic ratio and braking balance.
• D-MAX / TFR UCR cross-coverage: While these models are referenced in supplier listings, production changes across platforms may affect caliper dimensions or guide pin placement. Physically compare the replacement against the original unit before bulk commitment.

1. Confirm the required part first: Verify that the original unit is the front left disc-brake caliper (not a drum-brake wheel cylinder) and that the vehicle uses disc front brakes. Compare the bleed screw location and hose fitting orientation to the replacement.
2. Safety first: Park on level ground, engage the parking brake, and chock the rear wheels. Loosen the front wheel lug nuts before raising the vehicle. Support the front corner securely on jack stands.
3. Disconnect the brake hose: Place a drain pan underneath, disconnect the brake hose from the caliper, and plug the hose immediately to prevent contamination and fluid loss.
4. Remove the caliper: Remove the mounting bolts (or slide pins, depending on configuration) securing the caliper to the bracket. Support the caliper weight to avoid stressing the hose.
5. Inspect the bracket and slide pins: With the caliper removed, inspect the mounting bracket and slide pins for wear, corrosion, or elongation. Replace if damaged — a worn bracket will cause uneven pad wear and caliper drag.
6. Install the new caliper: Position the 8092859700 caliper onto the bracket. Install the mounting bolts or slide pins and torque to the workshop manual specification. Do not over-torque — the caliper body can distort.
7. Reconnect the brake hose: Connect the hose to the caliper and tighten the banjo bolt or flare nut to specification. Use new copper washers where applicable.
8. Bleed the brake system: Fill the reservoir with DOT 3 or DOT 4 brake fluid and bleed the front circuit until clear, bubble-free fluid flows from the caliper bleeder screw.
9. Check for leaks and pedal feel: Pump the brake pedal to seat the pads and check for leaks at the hose connection and bleeder screw. The pedal should be firm and should not sink under sustained pressure.
10. Road test: Test drive at low speed, checking for even braking, no pull, and absence of drag or abnormal noise before returning the vehicle to service.

• Inspect the caliper and brake pads at every service or every 20,000–30,000 km — check for leaks, piston seizure, and even pad wear.
• Lubricate the slide pins with high-temperature brake grease at every pad replacement — dry or corroded pins are a leading cause of caliper drag.
• Replace the brake fluid every 2 years or according to the ISUZU schedule — degraded fluid accelerates caliper piston seal wear.
• Inspect the caliper dust boots for cracks or tears — a compromised boot allows water and dirt to enter the piston bore, causing corrosion and leakage.

• Standard packing: Neutral carton or customer-requested packaging. Packaging size reference: 24 × 16 × 11 cm.
• Package contents: 1 × Front Left Brake Caliper Assembly. Brake pads, mounting bracket, slide pins, and brake hose are not included unless explicitly stated — confirm exact package contents at inquiry.
• Set options: Caliper only (standard) / caliper + bracket kit (subject to separate bracket availability) — 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: Front right caliper (different reference), brake pads, brake discs, caliper repair kits, slide pins, and brake fluid for the TFR54 platform.