Skip the auto shop - Our mechanics make house calls

Q: Brake pedal feels spongy.

asked by on

My brake pedal has a spongy feel to it. The pedal only goes about 3/4 of the way to the floor. I've had the master cylinder replaced about three times.

A: The feeling of a spongy pedal indicates old...

The feeling of a spongy pedal indicates old brake fluid and/or air in the brake system of your Navigator. While it was mentioned that the master cylinder was replaced three times, more information is still necessary for a proper diagnosis of this issue. I would want to know why the master cylinder was replaced the first time. It should also be asked if this was due to a similar situation of a spongy pedal, or did this symptom develop after the first initial repair.

It is very possible there are a few things going on here with your vehicle. You may have a collapsed hydraulic brake hose or a stuck piston inside one of the calipers. Another possibility I have encountered is when the master cylinder was replaced and the push rod that applies the force to the master cylinder needs to be adjusted. As you can see, because there are so different possibilities for spongy pedal and because any concerns with the braking system is a major safety issue, I recommend enlisting the help of a certified mechanic as soon as possible for proper diagnosis.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Q: Check engine light keep coming up change all 4 o2 sensor and still engine light comes on. Wand they are new

Unfortunately in order to give you a better answer I would need to know what code is setting in the computer. Depending on what code is stored you may have a problem with the catalytic converters in the exhaust, or...

Q: Car won't start

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the...

Q: My brakes go all the way down and are hard to stop

If the hydraulic system was opened, for example, if rebuilt calipers were installed, then yes it could very well be that the entire four wheel system needs to be carefully bled, preferably using a pressure bleeder, and also being mindful...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...