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Discussion Starter · #1 ·
Can anyone tell me if a 2008 Versa has a brake booster check valve and where it is located? My brakes are fading a lot, sometimes to the floor, no idiot lights come on and no codes thrown. Replaced master cylinder with no change, suspecting the brake booster unless something in the ABS system is bad. Thought the check valve maybe worn, just passed 80,000 miles. Might need to have dealer diagnose the issue.
Thanks.
 

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Yes it does. It is located on the intake manifold.

When was the last time the brake fluid was flushed and/or changed?
How are the wheel cylinders on the drum brakes? Piston seals on the calipers?
How are the rubber brake hoses?
Are pads/shoes in good shape?
Are the drums/rotors in good shape?

A competent brake shop can do diagnosis and repairs cheaper than a dealer.
 

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Discussion Starter · #3 ·
This Spring flushed the brake lines replaced rear pads. The brake pads and rotors were replaced last year no issues.
When I hit the brakes hard no problem, when its wet they pulsate as they should. When I apply the brakes slowly that's when the issue comes into play. That's why I was thinking of a brake booster issue.
 

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Booster issues make the pedal hard because leaks impare vacuum assist. I'd look for sticking components here if there are no leaks. Like slider pins, pads, or piston.

If on start up the pedal drops while you're pushing it, booster is good.

Try pushing the pedal with the car off. It should not sink to the floor. Usually master cylinder if it does.
 

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Discussion Starter · #5 ·
Thanks for the input, Pedal doesn't move until start up then it sinks slightly. I believe your right about something binding or leaking. I'll pull the wheels and look things over. I need to rotate the tires anyway.
 
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