Is it dangerous to drive with a failing master cylinder?

Yes, this is one of the most critical braking components — any suspected fault should stop you from driving the vehicle until repaired, given the risk of brake failure.

Can the cylinder be rebuilt instead of replaced?

Rebuild kits exist for some models, but given the safety-critical role of this component, a new or quality remanufactured unit is generally the safer choice.

What is the master cylinder made of?

An aluminium or cast iron body with internal pistons and rubber seals.

What is this part and what does it do?

Full description available in the product description section above. Contact us with clarifying questions.

How do I tell if my part is faulty?

See the 'Signs of a faulty part' section above or run a diagnostic at an auto service.

Yes - all our used parts are tested before sale and sold with guaranteed quality.

When should the part be replaced?

When warning signals appear, diagnostic codes are present, or the system malfunctions.

Brake booster master cylinder VW POLO 2011

Name: Brake booster master cylinder VW POLO 2011
Brand: VW
SKU: 6R0611301A-1
Price: 27.00 EUR
Availability: InStock

OEM: 6R0611301A-1

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

What is this part and why does it matter?

The brake master cylinder converts the driver’s pedal pressure (amplified by the booster) into hydraulic pressure, sent through brake lines to each wheel.

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Not sure about compatibility? Send us your car's VIN and we'll confirm.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

Brake pedal sinks slowly to the floor under sustained pressure
Brake fluid leak visible near the pedal box or under the vehicle
Spongy or inconsistent brake pedal feel

Installation information

Requires bench-bleeding the new cylinder before installation, then bleeding the full brake system afterward — always use fresh brake fluid.

Donor vehicle description

VIN: WVWZZZ6RZCY032437
Make, model: VW POLO
Year: 2011
Engine: Benzīns 1.2L 44KW - CGPB
Transmission: Mehāniska - NR
Drive: Priekšēja
: Stūre kreisajā pusē
Colour: B4 / B9A

146 parts from this car

Frequently asked questions

A worn internal seal in this cylinder lets brake fluid bypass internally rather than building pressure, causing the pedal to slowly sink under sustained pressure.

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September 2026
Price: excellent.
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August 2026
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August 2026
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August 2026
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June 2026
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May 2026
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