Q: Brake pedal loses pressure

asked by on January 27, 2016

The brake pedal loses pressure when I start the car. I can push it to the floor. When I turn the car off, pressure is there. There is also a leak coming from rear passenger wheel.

From the description provided, it appears that the symptoms are due to the leak in the brake system that you found in the rear passenger wheel. In order for your power brakes to work correctly, the engine needs to be running. This allows it to supply vacuum to the brake booster, which in turn allows the driver to easily depress the pedal. When the pedal falls to the floor, it is because the brake fluid inside is escaping the system through a leak. This and any repair regarding brakes is a big safety concern and one that needs to be addressed immediately. Enlisting the help of a certified mechanic will allow you to pinpoint the brake fluid leak so that it can be repaired, bled, and rechecked to get your Mustang safely back on the road.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Oil light on

Hello. This could be an indication that your oil pump needs to be replaced. However, it could also indicate that your engine is going bad and needs to be replaced. I would recommend that you have a certified technician, like...

Coolant disappearing for radiator.

If your car overheated and you are loosing coolant but no leaks are found the coolant is going somewhere. The place it is going is into the engine. The heads may be warped and the head gasket is leaking coolant...

What does the anti-lock braking system (ABS) Warning Light mean?

The anti-lock braking system (ABS) Warning Light is located on the instrument panel. When this light illuminates, then the vehicle has detected a problem with the ABS system, and as a result, the ABS system is turned off. Since the...

Related articles

What Does It Mean to Bleed Your Brakes?
While While it sounds like a medical procedure, bleeding the brakes is a common maintenance procedure that needs to be done on a regular basis in order to keep a vehicle operating safely. Bleeding the brakes falls under the routine...
How Do I Prepare My Car for Summer?
Summer's Summer's heat, dust, and stop-and-go traffic will take their tolls on your vehicle. Follow these tips to ensure optimum wellness of your car: Air Conditioning: Have your air conditioning inspected by a qualified technician. Newer models have...
Top 10 Brake System Issues Every Car Owner Needs To Know
Every driver should know how to check for problems with car brakes. Warped rotors, leaky brake hoses, and squeaky brakes are among the most common.