Soft Breaks

[Mopar-Charger]

When I press the brake easily, it's soft and sinks to the floor without slowing the car down.

I've checked all the brake lines, no leaks. The master cylinder is full of fluid what could it be?

If I pump the brakes i can slow down, but the brake pedal still sinks to the floor.

If I press the brake hard the first time, it will stay hard, until let off and press it easy.

The problem has only started recently.

 

[cudajunction]

You need a new master cylinder..

 

[Kern Dog]

Looking at your name and stats, can I guess that you are new to the hobby?
Plenty of good help to be found here. Sometimes it takes a bit of time, but I have learned from many members here.
Brakes and suspension are pretty easy once you understand them. As stated, you likely need a new master cylinder. If you have never replaced one before, it can be done by a novice if you are willing to take your time, listen and follow the advice of others.
A failing master cylinder can and will do what you describe. One good stop and the pedal sinks to the floor. If there is something as simple as air in the line, the pedal can be repeatedly pumped and it will hold pressure.
Lets just say that you need to replace the master cylinder. Several people will wisely suggest to you to BUY A NEW one, not rebuilt. The failure rate of rebuilt master cylinders is much higher than with new ones.
Look on YouTube for "Bench bleeding master cylinder". There will be a few videos to help. In fact, I have found that YouTube has plenty of videos to assist you in many automotive tasks that seem difficult.
Report back and keep us in the loop.

 

[5.7 hemi]

X3 on the mc!!

 

[Mopar-Charger]

Looking at your name and stats, can I guess that you are new to the hobby?
Plenty of good help to be found here. Sometimes it takes a bit of time, but I have learned from many members here.
Brakes and suspension are pretty easy once you understand them. As stated, you likely need a new master cylinder. If you have never replaced one before, it can be done by a novice if you are willing to take your time, listen and follow the advice of others.
A failing master cylinder can and will do what you describe. One good stop and the pedal sinks to the floor. If there is something as simple as air in the line, the pedal can be repeatedly pumped and it will hold pressure.
Lets just say that you need to replace the master cylinder. Several people will wisely suggest to you to BUY A NEW one, not rebuilt. The failure rate of rebuilt master cylinders is much higher than with new ones.
Look on YouTube for "Bench bleeding master cylinder". There will be a few videos to help. In fact, I have found that YouTube has plenty of videos to assist you in many automotive tasks that seem difficult.
Report back and keep us in the loop.

I'll take this into much consideration! Thanks for the help

 

[kb67mopar]

Definitely the master cylinder. Not that hard to swap but mostly you need to be a contortionist.

 

[67 coronet]

i agree on the master as your most likely problem.just for your info,make sure you bench bleed the new master before you put it on the car.it will save you much time and troubleshooting.

 

[rsd859]

If your gonna stay in the hobby invest in a mity vac. Perfect tool for the guy who has nobody to help bleed brakes.

 

[PUNKN8R]

Be sure to bleed the master cyl after you put back on car with the lines installed. I've seen many customers just bench bleed and think that's all they need to do install & go only to have more problems down the road.

 

[Kern Dog]

I'll take this into much consideration! Thanks for the help

Just last night I checked YouTube for tips on sanding and buffing clear coat on a car. I realized that i was using waaaaay too much rubbing compound when I was buffing. I love learning new ways to do stuff.