Reliance Auto Test located in Bicester, Oxfordshire

Call Us: 01869 320032


RAC Approved Garage

My Brake Pedal Depresses to The Floor, Why?

The brake pedal is sensitive and responds to the pressure accordingly when braking. So, if your brake pedal does not feel firm when depressed and goes all the way down to the floor even when you apply slight pressure, or if it feels mushy, there is a problem.

Why does my brake pedal sink to the floor?

If everything is ok with your car, your pedal will not depress all the way down to the floor when you apply brakes.

A brake pedal that sinks all the way to the floor could indicate a problem with the brake master cylinder or it could be due to a brake fluid leak. In all situations, a detailed vehicle health check is necessary; after the problem has been correctly identified, you may move on with the necessary repairs. For your safety, do not put it off for too long.

Any problems with your braking system may be hazardous to both you, your passengers and other road users. If your vehicle exhibits any of the following symptoms, then we highly recommend that you speak with one of our qualified technicians. It’s imperative, you’re not responsible for any accident by neglecting to maintain your vehicle.

What can cause the brake pedal to sink to the floor?

As we previously alluded to, there are two basic explanations for why this could be taking place. The first is a brake fluid issue. This suggests that a brake fluid leak in the braking system may be to blame for the drop in brake fluid pressure. The second, could be a problem with the brake master cylinder with the fluid getting past the seals. In such instance, even if you slam on the brakes, your braking system will not react as expected or will not react at all.

How to identify and correct a sinking brake pedal issue?

We’ve highlighted two of the causes of brake pedal sinkage. Here is an insight into how to diagnose the issues, however, we would always recommend seeking professional help when attempting to make any repairs:

  • Start by examining the brake fluid level.
  • If the brake fluid level is optimal, then you do not have a brake fluid leak issue on your hands.
  • On the other hand, there is a leak problem if you discover that your brake fluid levels are low or if you are entirely out of brake fluid.
  • The first step is to inspect all the brake lines coming from the wheels to see if there are any leaks.
  • The wheel cylinder must be changed, or the brake lines must be repaired if you discover a leak in the brake lines.
  • Typically, your brake warning lights may come on if there is a brake fluid leak. If this does not occur and there are no outward indications of a brake fluid leak, your brake master cylinder may be at fault.
  • There are two sets of seals on the braking master cylinder. An interior leak may occur if the seals are compromised or worn out. The brake master cylinder will need to be changed if this is the situation.
  • If your vehicle is equipped with an antilock braking system (abs), a leak in the abs unit might cause the brake pedal to sink to the floor.
CATLOC Solution to protect against Catalytic Converter theft

Get in touch to book an appointment

If you detect a problem with your braking system based on the above-mentioned symptoms, please do not ignore it, and keep driving. Get in touch with our Reliance Auto technicians by calling 01869 320032 or simply drop us an email to

Additionally, regular routine servicing and brake checks are crucial for increasing your vehicles longevity and maximising its performance. Not only does it work to rectify any current wear and tear in your vehicle, but it also effectively aids in preventing further damage from presenting itself in the future.


Our Services


Vehicle MOT

Our fully-equipped garage enables us to undertake MOTs and inspections on all vehicles in the Class IV, V & VII categories and we have the technical expertise to work on models of any type and age.

Vehicle Servicing

Car servicing is essential for keeping your vehicle well-maintained and in the best possible condition. Although not a legal requirement like MOTs, full annual servicing is highly recommended to increase the life-span of your vehicle and reduce the need for major car repairs.

Wheel Alignment

If you’re concerned about your vehicles wheel alignment, our latest equipment uses advanced technology making even 4 wheel alignment more accurate.

Breaking Systems, Discs & Pads

Brakes that function and operate smoothly are extremely important to ensure a safe driving experience. Brake discs & pads are crucial components of your car’s braking system and keeping them in optimal working condition is vital for the safety of both you and other drivers around you.

Vehicle Diagnostics & Repair

If you have a vehicle fitted with an Engine Control Unit (ECU), our qualified technicians can carry-out advanced car diagnostics and run your car through an ECU code reading machine, which will produce a unique report indicating if any further work needs to be done.

Inspection & Safety Checks

If you’re vehicle is experiencing vibrations or your vehicle is pulling to one side, then it’s time to check your brakes, suspension, steering or tyres.

General Repairs

Whether it’s an electrical fault or a worn clutch, a transmission or suspension problem, our experienced technicians can quickly diagnose and repair your vehicle.

Tyre Checks & Replacement

For safety reasons, it is recommended that you replace your tyres before the legal limit is reached. As an official partner of BlackCircle tyres, let us quote you.

Regular vehicle servicing and maintenance should also be done to avoid future inconvenience and unfortunate incidents on the road like sudden breakdown etc. It is wise to schedule and book a routine service to ensure your vehicle is always running smoothly whilst also protecting your safety on the road.

Pricing & Plans

For a quote, simply drop us a message to start a conversation and explain your vehicle concerns, or give us a call. We’re here to help!

Book Appointment

To book an appointment, you can send us a message with details of the problems with your vehicle. You can reach us via Facebook & Google, or simply pick up the phone and give us a call.

Contact Us

Call us

(01869) 320032