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Master Cylinder 5Q0-721-388-H
When the master cylinder begins to fail, it can lead to symptoms such as a soft or spongy brake pedal, fluid leaks, or warning lights on the dashboard. Neglecting these signs can result in compromised braking performance, putting safety at risk.
Choosing the OEM part with number 5Q0-721-388-H ensures proper integration with the braking system and maintains the integrity of the vehicle's hydraulic network. An original part is engineered to the same standards as the initial component, offering peace of mind against potential failures from low-quality substitutes.
Dostępne w sklepach 31 ofert
Dopasowanie do pojazdu 92 pojazdy
Specyfikacja techniczna
| OEM Part Number | 5Q0721388H |
|---|---|
| Operating Mode | Hydraulic |
| Stroke Length | 139 mm |
| Weight | Approximately 0.199 kg |
| Drive Orientation | Left-hand drive (LHD) vehicles only |
| Brand Group | Volkswagen Group |
| Compatible Brands | VW, Audi, SEAT, Škoda, Porsche, Cupra |
| Replacement Type | As-needed (on symptom or failure) |
Jak wymienić Master Cylinder
Replacing the 5Q0721388H clutch master cylinder is a moderate-difficulty job typically requiring basic hand tools and hydraulic fluid. Always consult your vehicle-specific service manual for torque values and VIN-confirmed fitment before beginning.
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Prepare the Vehicle
Park on a level surface and turn off the engine. Allow the vehicle to cool completely. Disconnect the negative battery terminal to eliminate any risk of electrical issues during the repair.
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Access the Clutch Master Cylinder
Locate the clutch master cylinder near the firewall on the driver's side. Remove any trim panels, covers, or components obstructing clear access to the unit.
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Disconnect the Hydraulic Line
Place a drip tray beneath the master cylinder. Carefully disconnect the hydraulic line from the master cylinder fitting. Expect some residual fluid to drain — have rags ready to catch spills.
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Remove the Old Master Cylinder
Remove the mounting bolts securing the master cylinder to the firewall. Detach the pushrod from the clutch pedal assembly. Carefully extract the old unit from its mounting position.
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Install the New Master Cylinder
Position the new 5Q0721388H into place. Attach the pushrod to the clutch pedal assembly first, then secure the master cylinder to the firewall with the mounting bolts torqued to the specification in your service manual.
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Reconnect the Hydraulic Line
Reconnect the hydraulic line to the master cylinder fitting. Tighten to the torque value specified in your vehicle's service manual to prevent leaks.
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Refill and Bleed the System
Refill the clutch fluid reservoir with the correct hydraulic fluid as specified for your vehicle. Bleed the clutch hydraulic system thoroughly to purge all air pockets and restore a firm pedal feel.
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Test and Verify
Reconnect the battery. Start the engine and test the clutch pedal through several full depressions. Verify smooth gear engagement, no spongy pedal feel, and check the hydraulic line connection for any signs of leaking before returning the vehicle to service.
Oznaki zużycia części
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Clutch Pedal Sinks to Floor
The clutch pedal depresses fully and does not return to its normal position, indicating internal seal failure or loss of hydraulic pressure within the master cylinder.
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Spongy or Unresponsive Pedal
A soft, spongy clutch pedal feel suggests air has entered the hydraulic circuit, often caused by a failing master cylinder that can no longer maintain a sealed pressure circuit.
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Visible Hydraulic Fluid Leak
Fluid pooling near the clutch pedal inside the cabin or around the master cylinder on the firewall side is a direct sign of seal degradation requiring immediate replacement.
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Difficulty Shifting Gears
Inability to fully disengage the clutch due to insufficient hydraulic pressure makes gear changes rough, grindy, or impossible — a classic indicator of master cylinder failure.
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Clutch Engagement Point Changes
A noticeable shift in where the clutch bites — particularly if it moves lower over time — can signal the master cylinder is losing its ability to build and hold hydraulic pressure consistently.
Częstotliwość wymiany
The clutch master cylinder has no scheduled replacement interval. Service life depends on driving conditions, fluid maintenance, and seal integrity. Always replace if any failure symptom is present.
Najczęściej zadawane pytania
Is 5Q0721388H compatible with my VW Golf or GTI?
This part fits the VW GTI (2015–2021), Golf, Golf R, Golf Alltrack, Golf Sportwagen, and Jetta (2019–2023), among others. Always confirm fitment using your full VIN before ordering, as specific engine codes and build dates can affect compatibility.
Will this part fit right-hand drive vehicles?
No. The 5Q0721388H is designed specifically for left-hand drive (LHD) vehicles. If your vehicle is right-hand drive, you will need a different part number.
What is the best aftermarket alternative to the OEM part?
VALEO part number 876168 is the top-recommended aftermarket equivalent. VALEO is an established OE supplier to Volkswagen Group and their clutch master cylinders meet or exceed factory specifications.
Do I need to bleed the clutch after replacing the master cylinder?
Yes, bleeding is mandatory. Any air introduced into the hydraulic circuit during removal and installation must be fully purged. Skipping this step will result in a spongy pedal and unreliable clutch engagement.
What fluid goes in the clutch master cylinder reservoir?
Use only the hydraulic fluid type specified in your vehicle's owner manual — typically the same DOT-rated brake fluid used in the brake system on most VW Group vehicles. Do not mix fluid types.
How do I know if my clutch master cylinder is failing versus the slave cylinder?
A failing master cylinder typically shows a sinking or spongy pedal and may have visible leaks near the firewall or inside the cabin at the pedal box. A failing slave cylinder more commonly shows leaks near the transmission bell housing. A full hydraulic system inspection by a qualified technician is recommended to pinpoint the failed component.
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