This is topic Brake booster bad??? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 89notchkid (Member # 10698) on :
 
So after doin a whole of work to the mustang I turn the car on and realized my brake pedal got really hard and as I press it I can hear air from somewhere so how can I check if my brake booster is bad or where should I look to see if its leaking... By the way I already bled my brakes thinking that was problem.
 

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Posted by LXjames (Member # 10791) on :
 
Take a spray bottle with water in it spray it over the engine but directed no just spray on the intake lol and if the car react then you have a problem where you sprayed
 

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Posted by 93 twintrbo (Member # 10475) on :
 
You will need to check and make sure the vacuum line is intact going to the booster. If that is ok which it probably is, you have a leak in the booster diaphram. Once the booster diaphrams start to leak, you will sometimes hear a vacuum type of noise where the booster bolts to the firewall. The booster is supposed to hold vacuum after the engine is turned off ( if the check valve and booster are good).
 

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