Rear Left Lower Brake Wheel Cylinder 47580-36210 4758036210 For TOYOTA Coaster HZB50 RZB40 RZB50 BB42 Dyna 200 Toyoace 3B 14B 15B — OEM Verified Direct Fit, 1-1/8" Bore, Grey Cast Iron

The Brake Wheel Cylinder with OEM numbers 47580-36210 / 4758036210 is a verified direct-fit replacement for TOYOTA Coaster buses and Dyna 200 / Toyoace light trucks. As a critical hydraulic component of the rear drum brake system, it converts hydraulic pressure from the master cylinder into mechanical force that pushes the brake shoes against the drum to slow or stop the vehicle.

This unit is specifically the rear left lower (LH, Rear or Lower) position cylinder — designated R.LH.A in Toyota parts catalogs and Russian aftermarket listings. It is engineered for Coaster HZB50, RZB40, RZB50, BB42 and related BB/BZB/TRB/XZB chassis families, as well as Dyna 200 BU100/BU110/BU140 and Toyoace G25 applications from the mid-1990s through the early 2000s. The body is constructed from grey cast iron with a 28.58 mm (1-1/8 inch) bore.

• Bore Diameter Verified: 28.58 mm (1-1/8 in) — confirmed by supplier technical data sheet ("Bore Size: 1 1/8" 28.58MM").
• Position Verified: Rear Left Lower (LH, Rear or Lower / R.LH.A) — Toyota EPC catalog confirms "FOR LH, REAR OR LOWER"; Russian aftermarket listings confirm "R.LH.A" for Dyna 200.
• Material Verified: Grey Cast Iron — confirmed by supplier technical specification ("Material: Grey Cast Iron") and Chinese supplier listing ("材质: 铁").
• Weight Reference: 898 g (BGF listing) / 1,286 kg (Blue Print ADT34466 specification) / 1,350 g (SW-T1474 / WC-T784 listing). Weight varies by brand and whether packaging or the bleeder screw is included — confirm net weight at inquiry.
• Bleeder Screw Configuration: Multiple independent listings describe this unit as "БЕЗ ПРОКАЧКИ" / "W/O BLEEDER" — i.e., without a bleeder screw in standard aftermarket configuration. Confirm whether your application requires a bleeder-equipped variant.
• OEM Cross-Reference Verified: Replaces 47580-36210, 47580-37071, 47580-37072. Aftermarket cross-references include Blue Print ADT34466, AISIN WCT-066 / WCT-208, ADVICS WCT-066 / WCT-208, TRW BWN740 / BWN864, JAPANPARTS CS-234, ASHIKA 67-02-234, BGF BWN740 / F026A02348, AW1255, SW-T1474 / WC-T784.
• Vehicle Coverage Verified: Confirmed for Coaster (TRB5#, XZB5#, RZB4#, HZB5#, BZB5#, BB4#) 93–03, Dyna 200 (BU100, BU110, BU140) 95–99, and Dyna 400 (XZU404, XZU342, XZU414, XZU424, XZU434) 03–06.

• Brake fluid leak at the wheel: Visible wetness around the backing plate or inside the brake drum — 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 wheel cylinder is not applying equal force, causing imbalance.
• Brake fade or overheating drums: Extended stopping distances and hot brake drums — a failing cylinder may cause dragging or insufficient shoe application.
• Brake warning light illumination: Dashboard brake warning activates, often accompanied by abnormal brake behavior — inspect the wheel cylinder immediately.

Confirmed Fitment Sources: PartsSouq Toyota EPC confirms 4758036120 as "CYLINDER ASSY, REAR WHEEL BRAKE (FOR LH, REAR OR LOWER)" for BB2#, FB30, HB30, RB20 applications (08.1984–12.1986). The brake-cylinder.com technical sheet confirms the same OE number for Dyna 200 (BU100, BU110, BU140) 1995–1999, Dyna 400 (XZU series) 2003–2006, and the broader Dyna platform (KD_, LY_, _Y2_, _U3_, _U4_, _U6_, _U8) 2006+. Huiparts confirms the 47580-36210 application for RZB40, RZB50, HB50 and lists it as "后刹车分泵.LH后" (rear brake cylinder, LH rear).

1. Confirm position first: Verify that the replacement is the rear left lower (LH, Rear or Lower / R.LH.A) cylinder, not the front/upper counterpart (47570-36210). Compare the OEM number and physical orientation to the original unit.
2. Safety first: Park on level ground, engage the parking brake, and chock the front wheels. Wear safety glasses and gloves.
3. Remove wheel and drum: Loosen lug nuts, raise the vehicle, remove the wheel, and extract the brake drum. Inspect drum and shoes for wear.
4. Disconnect hydraulic line: Place a drain pan underneath, disconnect the brake line from the wheel cylinder, and plug the line immediately to prevent contamination.
5. Remove old cylinder: Unbolt the wheel cylinder from the backing plate. Note the orientation of the push rods and the rear/lower position for correct reassembly.
6. Clean mounting surface: Remove rust, dirt, and debris from the backing plate mounting area. Inspect the backing plate for damage or deformation.
7. Install new cylinder: Position the new wheel cylinder (47580-36210) onto the backing plate and tighten mounting bolts to specification.
8. Reconnect brake line: Connect the hydraulic line. Tighten to thread specification without over-torquing.
9. Install shoes and drum: Reinstall brake shoes, adjuster components, and drum. Set shoe-to-drum clearance to the workshop manual specification.
10. Bleed the brake system: Fill the master cylinder reservoir with DOT 3 or DOT 4 brake fluid. Bleed until clear, bubble-free fluid flows. Note: This unit is frequently supplied WITHOUT a bleeder screw in standard aftermarket configuration — confirm your bleeding method or verify bleeder-equipped availability before installation.
11. Test brakes: Pump the pedal to seat the shoes, check for leaks, and road-test at low speed before returning the vehicle to service.

• Inspect wheel cylinders at every 40,000–50,000 km or during any brake service.
• Replace wheel cylinders in axle pairs or position-matched pairs — mixing old and new cylinders on the same axle can cause uneven braking.
• Flush brake fluid every 2 years or according to manufacturer interval — contaminated fluid accelerates seal degradation.
• Inspect the backing plate for brake fluid wetness at every oil change — early detection prevents catastrophic seal failure.

• Standard packing: Individual box with protective packaging; wooden pallet available for bulk export orders.
• Package contents: 1 × Brake Wheel Cylinder (installation hardware not included; bleeder screw frequently NOT included in standard configuration — confirm at inquiry).
• Set options: Single cylinder / rear LH pair (47570-36210 + 47580-36210) or full rear set (4 positions) — specify at inquiry.
• Suitable for: TOYOTA Coaster / Dyna / Toyoace brake system repair shops, bus fleet maintenance departments, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
• Related parts available: Paired counterparts 47570-36210 (LH front/upper), 47550-36210 (RH front/upper), and RH lower reference; brake shoes, brake drums, wheel cylinder repair kits (e.g., Yamasida 4758036210K / Seiken SK45061R2), and brake fluid (DOT 3/DOT 4) for the Coaster/Dyna platform.