Brake Master Cylinder Replacement

A pedal that slowly sinks to the floor at a stop, with no visible leak, usually means the master cylinder seals are bypassing.

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Service Info

Typical Duration 2 hours

We rule out the booster and a fluid leak, replace the master cylinder, bench bleed the new unit, bleed the system at each corner, and check pedal feel under load.

Skip the garage, our master mechanics come to you

At your home or office
Fair & transparent pricing
6-month, 6000km warranty

The Most Trusted Mobile Brake Master Cylinder Replacement

A brake pedal that slowly sinks to the floor while you hold it at a stop, with no visible fluid leak anywhere, usually means the master cylinder seals are bypassing internally. It is one of the few brake faults that gives almost no warning noise.

Why Choose Our Mobile Brake Master Cylinder Replacement Services?

A failing master cylinder affects the whole braking system rather than one wheel, and it deteriorates without the squeal or grinding that warns you about pads. A sinking pedal is a reason to stop driving the car, not to book it in for next month.

Why We’re the Best Choice for Mobile Brake Master Cylinder Replacement

We check the brake booster and the fluid level first, because both cause a similar pedal feel and neither needs a master cylinder. After fitting, the unit is bench bled before the system is bled at each corner, which is what prevents a spongy pedal afterwards.

The master cylinder generates pressure for the entire braking system, so when its seals bypass, every wheel is affected at once, with no warning noise.

Frequently Asked Questions

  • What are the signs of a failing brake master cylinder?
    The classic sign is a brake pedal that slowly sinks toward the floor while held at a stop, with no visible fluid leak. You may also notice the pedal feeling inconsistent, or brake fluid disappearing from the reservoir with nothing wet at any wheel.
  • Can I drive with a failing master cylinder?
    No. The master cylinder generates the pressure for the entire braking system, and once its seals begin to bypass, the failure is progressive and unpredictable. A pedal that sinks is a reason to stop driving the car.
  • Is it the master cylinder or the brake booster?
    They feel different. A failing master cylinder gives a pedal that sinks slowly under steady pressure. A failed booster gives a pedal that is hard to push but does not sink. Both are checked before either is replaced.
  • Why is my brake fluid low with no visible leak?
    Fluid disappearing with nothing wet under the car usually means it is leaking internally past the master cylinder seals, or being drawn into the brake booster through a failed seal. Worn pads also lower the reservoir level naturally as the caliper pistons extend.
  • Does a new master cylinder need bench bleeding?
    Yes. Bench bleeding removes air from the unit before it is fitted to the car. Skipping it traps air that is very difficult to remove afterwards, which leaves a permanently spongy pedal.