Brake Pedal Hard to Push Down - Inspection & Repairs Hamilton | Grimmer Motors Hamilton
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Brake Pedal Hard to Push Down – Inspection & Repairs Hamilton

Why is the brake pedal hard to push?

Sometimes the brake pedal can become hard to move, meaning the driver has to put more pressure on the brake pedal. This can be dangerous, especially if the driver is used to only applying minimal pressure to the brake.

Hard to press brakes are usually caused by a problem in the vacuum brake booster, a common part of modern braking systems.


What does the vacuum brake booster do?

The brake booster enhances the hydraulic effects of your vehicle’s braking system.

Inside the brake booster, a vacuum is used to make it easier for the driver to press the brake pedal down. Without the vacuum, the driver would struggle to press the brake pedal hard enough to stop the vehicle.

Direct Injection engines generally don’t get their brake vacuum from the intake manifold, instead, they create their own vacuum from a vacuum pump which has a vacuum pressure sensor attached to it. This way if the vacuum pump fails, which means your brakes will suddenly stop working properly, a light on the dash is instantly turned on to warn you.


What causes faults in the brake booster?

Most common brakes boosters are fully mechanical, meaning they have no electrical or electronic controls or sensors.  There are several components that can fail in a brake booster system. These include:

  • The brake booster vacuum chamber or brake booster vacuum diaphragm leaks.
  • The vacuum line between the brake booster and the intake manifold.
  • The one-way valve in the vacuum line between the brake booster and the intake manifold.
  • Also for “direct injection engines” the vacuum pump itself can fail.
  • Also for “direct injection engines” the electrical control circuit can fail.


Other symptoms of a failing brake booster:

Brakes are less responsive – Your vehicle may take longer to stop when the brakes are applied. This can cause safety hazards so we recommend that you get your vehicle fixed as soon as possible.

Loud hissing noise – This can be caused by a vacuum leak in the lines that supply your brake booster with air from the intake manifold.

Engine Idles differently when brake pedal depressed – this could indicate an issue with the vacuum supply to your brake booster, or possibly extra air entering the intake manifold when the brake pedal is depressed.

Please note any of the above symptoms will cause your vehicle to fail a Warrant of Fitness (WoF). 


Brake Booster Vacuum Pump Replacement in Hamilton

If your vehicle is producing any of the symptoms above, we are able to help you!

Getting your brake booster and/or vacuum pump replaced will allow for improved braking with increased responsiveness.

For fast, honest, accurate diagnosis and reliable brake repairs in Hamilton, bring your vehicle to Grimmer Motors today.



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Address: 998 Heaphy Terrace, Fairfield, Hamilton

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