1996 Brake Booster
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Joined: Apr 2018
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1996 Brake Booster
Installed a new brake booster and MC. The pedal sinks to the floor slowly and grabs the brakes at the last couple inches before it hits the floor. The pedal is the same whether the car is running or not, EXACTLY the same. It NEVER firms up after pumping with the car off. Leak?
Today I was working on something else so I decided to try something. I took the vacuum line off of the intake manifold leaving it still connected to the check valve on the booster and sucked on it like it was a straw. I could freely pull air through it. It never got hard to pull air through. It's like a wide open straw. When I blow into it the check valve stops all air and it wont pass. But if I pull its just wide open. Would you suspect a leak?
It is a crappy autozone one. But since I have read so many horror stories I decided to buy local so I could switch out if I run into this problem.
What do you think?
Thank you
Doug
Today I was working on something else so I decided to try something. I took the vacuum line off of the intake manifold leaving it still connected to the check valve on the booster and sucked on it like it was a straw. I could freely pull air through it. It never got hard to pull air through. It's like a wide open straw. When I blow into it the check valve stops all air and it wont pass. But if I pull its just wide open. Would you suspect a leak?
It is a crappy autozone one. But since I have read so many horror stories I decided to buy local so I could switch out if I run into this problem.
What do you think?
Thank you
Doug
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
Installed a new brake booster and MC. The pedal sinks to the floor slowly and grabs the brakes at the last couple inches before it hits the floor. The pedal is the same whether the car is running or not, EXACTLY the same. It NEVER firms up after pumping with the car off. Leak?
Today I was working on something else so I decided to try something. I took the vacuum line off of the intake manifold leaving it still connected to the check valve on the booster and sucked on it like it was a straw. I could freely pull air through it. It never got hard to pull air through. It's like a wide open straw. When I blow into it the check valve stops all air and it wont pass. But if I pull its just wide open. Would you suspect a leak?
It is a crappy autozone one. But since I have read so many horror stories I decided to buy local so I could switch out if I run into this problem.
What do you think?
Thank you
Doug
Today I was working on something else so I decided to try something. I took the vacuum line off of the intake manifold leaving it still connected to the check valve on the booster and sucked on it like it was a straw. I could freely pull air through it. It never got hard to pull air through. It's like a wide open straw. When I blow into it the check valve stops all air and it wont pass. But if I pull its just wide open. Would you suspect a leak?
It is a crappy autozone one. But since I have read so many horror stories I decided to buy local so I could switch out if I run into this problem.
What do you think?
Thank you
Doug
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Pro
Joined: Apr 2018
Posts: 557
Likes: 105
As mentioned above I went back and bled the lines again and BOOM! Pedal is rock hard!! I am glad because I really wasn't looking forward to taking the booster out again.
I did it with a MITYVAC took about 20 minutes with the wheels off. Followed the manual's instructions on which ones to do in what order - 1-RR 2-LR 3-FR 4-FL and number 3 let go of a ton of air!!
I did it with a MITYVAC took about 20 minutes with the wheels off. Followed the manual's instructions on which ones to do in what order - 1-RR 2-LR 3-FR 4-FL and number 3 let go of a ton of air!!
