ZF 4699.109.029 BRAKE PARTS | OEM Genuine Part

Overview

The ZF 4699.109.029 BRAKE PARTS assembly is a critical OEM genuine component engineered for the internal braking system within ZF construction machinery transmissions. This specific part number, SKU 4699.109.029, functions as a precision-machined brake piston or actuator component that applies clamping force to the friction discs during gear shifts and parking brake engagement. It sits directly within the transmission valve body and clutch housing assembly, working in concert with the 4699101053: HOUSING to contain hydraulic pressure. When installed correctly, this part ensures positive engagement and disengagement of the brake pack, preventing unintended driveline movement in heavy-duty loaders and graders.

Symptoms of Failure

• Delayed brake engagement or gear slipping under load: When the 4699.109.029 component wears or develops internal seal damage, operators often report a noticeable lag between pedal application and actual braking force, particularly when maneuvering on inclines.
• Hydraulic fluid contamination or darkening: A failing brake part can shed microscopic metallic particles into the transmission oil, causing the fluid to appear gray or metallic-flecked, which accelerates wear on adjacent components like the 0634801038: SEALING RING.
• Audible grinding or chattering during deceleration: Worn brake pistons may fail to retract fully, causing constant light contact between friction plates, resulting in a distinct grinding noise that worsens as the machine warms up.
• Intermittent loss of parking brake hold: A degraded 4699.109.029 unit can cause the parking brake to release unexpectedly on slopes, a critical safety issue often traced back to internal leakage past the 0501319149: SCREW PLUG sealing point.

Technical Specifications

Compatibility

This OEM genuine brake part is designed primarily for ZF’s heavy-duty powershift transmission series used in construction machinery. It is a direct fit for the ZF WG180 and ZF WG200 transmission models, commonly found in wheel loaders, dozers, and excavators. It also serves as a service replacement for certain ZF 4WG-180 and ZF 4WG-200 variants. When replacing this component, technicians should also inspect the 4699301126: HOUSING for scoring or wear, as the two parts share a tight hydraulic clearance. For earlier ZF 3WG series transmissions, verify the piston bore diameter against the original part before ordering.

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