The brake master cylinder converts the driver’s pedal pressure (amplified by the booster) into hydraulic pressure, sent through brake lines to each wheel.
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.
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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August 2026
★★★★★
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Toyota Avensis
August 2026
★★★★★
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June 2026
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May 2026
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February 2026
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November 2025
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