Overview
The ZF 0501.207.081 BRAKE is a critical internal component engineered for the WG100 and WG110 series transmissions. This OEM genuine part functions as a friction-based stopping mechanism, engaging directly within the planetary gear set to control output shaft rotation during gear shifts and stationary operation. The SKU 0501.207.081 is precisely machined to interface with the 4651101007: TRANSMISSION HOUSING, ensuring that hydraulic pressure is correctly applied to lock or release the brake pack. Without this part, the transmission cannot maintain torque hold or execute smooth directional changes.
Symptoms of Failure
- Delayed or harsh engagement when shifting into gear: A worn 0501.207.081 brake often causes a noticeable lag or a hard clunk when moving from neutral to drive or reverse, as the friction material no longer grips effectively.
- Transmission overheating under light load: Slipping brakes generate excessive heat due to constant friction, leading to burnt fluid odor and elevated temperature gauge readings even during normal operation.
- Vehicle creeping forward or backward in neutral: When the brake fails to fully release, residual drag forces the output shaft to rotate, causing unintended movement when the transmission is supposed to be disengaged.
- Metallic grinding noise during deceleration: As the brake disc wears down to its steel core, metal-on-metal contact produces a distinct grinding sound, often accompanied by fine metallic particles in the transmission fluid.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 0501.207.081 |
| Outer Diameter | 180 mm (7.09 in) |
| Inner Diameter | 120 mm (4.72 in) |
| Thickness (New) | 4.5 mm (0.177 in) |
| Material | Sintered Bronze Friction Lining on Steel Core |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 0501.207.081 |
| Torque Capacity | 450 Nm (332 ft-lbs) |
Compatibility
This brake is primarily designed for the ZF WG100 and WG110 series transmissions, commonly found in medium-duty trucks and industrial machinery. It also fits select variants of the WG180 and WG200 models where the same brake pack assembly is used. For proper installation, ensure the 4651301029: HOUSING and 4651301024: HOUSING are free of scoring or warping. Always replace the 0634303928: O-RING during reassembly to prevent hydraulic fluid bypass around the brake piston.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Encloses the brake assembly and aligns planetary gears |
| 4651301029 | HOUSING | Provides mounting surface for brake piston and seals |
| 0634303928 | O-RING | Seals hydraulic pressure between housing and brake piston |
| 4651301024 | HOUSING | Supports brake disc stack and oil flow channels |
| 4651203002 | SCREEN SHEET | Filters debris from brake clutch hydraulic circuit |
| 4651303005 | SCREEN SHEET | Secondary filtration for brake cooling oil |
| 0636101032 | CAP SCREW | Secures brake housing to transmission case |
| 0630361028 | SEALING CAP | Prevents oil leakage from brake pressure test port |
| 4475280060 | SCREW PLUG | Closes hydraulic passage after brake assembly |
| 0634303312 | O-RING | Seals screw plug against high-pressure oil |
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