Brake pedal soft when car is on

 
Old 03-23-2019, 05:06 PM
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Default Brake pedal soft when car is on

I bled, I changed the master cylinder, brake booster hose has air when I unplugged it but I still canít figure out whatís going on. Nothings leaking. When car is off brake pedal get stiff but when car is on it goes soft, canít figure It out help
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Old 03-24-2019, 12:03 AM
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Default Re: Brake pedal soft when car is on

Can you explain us how did you bleed it?
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Old 03-24-2019, 12:47 AM
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Default Re: Brake pedal soft when car is on

Originally Posted by Josip. View Post
Can you explain us how did you bleed it?
I replaced the booster too. But I just put a tube into a water bottle cap and water bottle then put the other side of the tube into the brake front and rear nipple and just pump the brake then hold it in and loosen the nipple then repeat.
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Old 03-24-2019, 03:53 AM
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Default Re: Brake pedal soft when car is on

Try gravity bleeding starting at the caliber furthest from the master cylinder
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Old 03-24-2019, 06:34 AM
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Default Re: Brake pedal soft when car is on

Soft as in it goes all the way to the floor, or just softer than it is with the car off? If the latter - this is how a vacuum booster works...it makes it easier to press the pedal.
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Old 03-24-2019, 11:48 AM
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Default Re: Brake pedal soft when car is on

Originally Posted by DaX View Post
Soft as in it goes all the way to the floor, or just softer than it is with the car off? If the latter - this is how a vacuum booster works...it makes it easi er to press the pedal.
when the car is off, the first few press feels soft then gains pressure after the first few press. If I stop pressing it for a few minutes, it restarts and itíll be soft again but gains pressure. When you turn the car on, it suddenly loses that pressure and goes soft all the way to the floor but it will come back up.
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Old 03-25-2019, 02:46 AM
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Default Re: Brake pedal soft when car is on

Never mind, I found out why. My brake calipers was upside down on the wrong side. I put the left one on the right and vise versa. The bleeder nipple was facing down when it was suppose to face up.
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