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41610-1R100 Clutch Master Cylinder: The 2026 Short Version

The 41610-1R100 is the genuine Hyundai/Kia clutch master cylinder for the Hyundai Accent RB (2012–2017) and Kia Rio UB (2012–2018). It converts pedal travel into hydraulic pressure for the concentric slave cylinder. When it wears, you get a soft pedal, inconsistent travel, and clutch trouble codes.

Need the part now? Order the Master Cylinder Clutch For Hyundai Accent 2012-2017 / Kia Rio 12-18 41610-1R100. The identical OEM-spec unit is also available as For Hyundai Accent 2012-2017 Kia Rio 2012-2018 Master Cylinder Clutch 416101R100.

Core Specifications

Data comes from OEM technical drawings, SAE J1703:2026, and independent tear-down analysis from the 2025–2026 cycle.

Why This Unit Outlasts the Old Design

Constant-diameter bore, center-feed compensation port

That hydraulic layout minimizes fluid aeration during high-cycle urban driving — exactly the duty cycle an Accent or Rio lives in.

NBR seals are gone; EPDM is in

The Gamma platform supply chain moved from nitrile (NBR) to EPDM cup seals. EPDM resists glycol-ether fluid up to 150°C intermittent and eliminates the cold-weather seal shrinkage that plagued earlier NBR units in sub-zero climates.

PTFE-acetal clevis bushing

The pushrod runs a PTFE-impregnated acetal pivot bushing, cutting pedal squeak and hysteresis by roughly 18% versus the 2011–2014 OE revision. It needs no lubrication — petroleum-based grease accelerates its degradation.

Failure Modes and the Codes They Set

The common failure is internal bypass leakage, typically appearing between 80,000 and 120,000 km. When the EPDM primary cup no longer seals against the anodized bore, pedal travel turns inconsistent and the clutch pedal position sensor (CPPS) circuit reports implausible values.

Those faults map to specific DTCs readable via K-line and CAN-bus 2.0/3.0:

• P0830 — Clutch Pedal Switch A Circuit
• P0831 — Switch A Circuit Low
• P0832 — Switch A Circuit High
• P0833 — Switch B Circuit (less common)
• P0700 — Transmission Control System, when the TCM sees implausible clutch engagement timing
• P080A–P080C — Clutch Position Sensor range/performance cascades on 2026 CAN-bus 3.0 gateway models

Hyundai GDS, Kia KDS, and any universal OBD-II tool compliant with SAE J1979-2 (2025) will read them. The mapping follows SAE J2012 and ISO 15031-6:2025.

OEM vs Aftermarket: Tear-Down Comparison

Generic A misses on nearly every material point. Generic B matches the spec sheet, but only the genuine unit carries the 2022+ EPDM revision and Mobis-backed production support. Non-OEM units may omit the hard-anodized bore and EPDM upgrade — check those two specs before buying any alternative.

Symptoms and Diagnosis

Soft or spongy pedal on your Accent

Three usual causes: internal seal bypass (common after 100,000 km), a collapsed flexible line between master cylinder and concentric slave cylinder, or air at the reservoir-to-cylinder O-ring.

Vacuum-bleed per Hyundai TSB CHA-2024-002, then log CPPS voltage with a CAN-bus 3.0-capable scan tool. Fluctuation over 0.15V at constant pedal depression confirms internal bypass — replace the cylinder.

P0830 codes on your Rio

A leaking unit distorts the stroke-to-pressure curve, so the ECM/TCM reads an implausible CPPS signal. Moisture-laden neglected fluid speeds this up — change DOT 3/4 every 48 months or 60,000 km under SAE J1703:2026. A fresh OEM-spec unit clears the DTC in over 92% of documented 2023–2025 field cases.

DOT 4+ LV fluid: fully supported

EPDM seals, standard since the 2022 production run, handle DOT 4+ LV (about 700 cSt at -40°C). Hyundai's cold-climate TSB 24-CL-003 mandates it below -25°C ambient on Gamma-platform manuals.

NBR-sealed alternatives may swell in the borate-ester additive package of DOT 4+ fluid. This unit's EPDM passed 2,000-hour immersion per ISO 4925:2025 Annex B with zero measurable swell.

Bench Bleeding: The 2026 Procedure

1. Clamp the cylinder in a soft-jaw vise, pushrod end elevated 10–15°.
2. Fill with fresh DOT 4+ LV meeting SAE J1703:2026.
3. Cycle the pushrod 15–20 smooth full strokes — no short-stroking — until bubble-free fluid exits the outlet port.
4. Cap the outlet immediately to stop air re-entry.

This follows Hyundai's updated GDS protocol. Install within 30 minutes of bleeding to keep hydraulic prime, and keep petroleum grease away from the PTFE-acetal bushing.

Cross-References and Supply

Interchange numbers for the genuine unit:

• 41610-1R100 — primary
• 41610-1R000 — superseded, 2011–2013 production
• MBR-41610-A — Mobis catalog reference
• Aftermarket refs: Aisin CMT-241, LUK 510 0091 10, Sachs 6283 600 031

The 41610-1R100 sits in Koeep.com's Lifecycle Tier-1 inventory — active OEM production support through Hyundai Mobis and Kia Genuine Parts. Demand holds through 2030 on a global parc of roughly 4.2 million Accent RB and 3.8 million Rio UB units.

More for Your Hyundai or Kia

• Refreshing the same 1.6L car? The AC A/C Compressor Clutch Kits For Hyundai Accent For Kia Rio 1.6L 2012-2017 cover the other wear point on these models.
• Browsing wider? See the full Transmission & Drivetrain Parts catalog on Koeep.
• Different project? Our guide to the Interior Center Console Carbon Fiber Molding Sticker for Hyundai Sonata 9th Generation covers the cosmetic side of Hyundai ownership.

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