Designed as a precision aftermarket brake component, this aftermarket Rr. M/C Assy is specifically developed for the SYM Jet X 125I 125cc scooter, covering model years 2021 through 2022. Cross-reference OEM number: 43500-XMC-010.
The rear master cylinder assembly converts mechanical force from the brake pedal into hydraulic pressure. This unit includes the reservoir, piston, seals, and pushrod for a complete replacement solution.
Technical specifications: Bore diameter: 12.7mm | Piston stroke: 18mm | Reservoir capacity: 45ml | Seal material: EPDM compatible with DOT 4 | Body material: die-cast aluminum | Pushrod length: 72mm adjustable
Installation guidance: Mount to the frame using the two M6 bolts. Connect the brake light switch wiring. Fill with fresh DOT 4 fluid and bleed the entire rear circuit. Adjust pushrod free play to 1-2mm.
Replace when pedal feel becomes spongy despite bleeding, when fluid leaks from the reservoir cap or piston seal area, or when the piston fails to return smoothly.
This is an aftermarket replacement part, not an OEM genuine component. SKU: SYM-001102.
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