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Losing brake power and engine stalling HELP!

581 Views 3 Replies 4 Participants Last post by  nrkrel
Hi everyone,

I'm a novice when it comes to mechanics so bear with me...basically, I noticed the last few times I've driven my 72 z that when I brake it takes a lot more effort to do so. When I brake, a whooshing noise -- almost like air is escaping somewhere near the pedal -- can be heard coming from near the pedal. The brakes still work, it just takes a lot more effort to come to a stop. Also, my car is dying when I brake ... so when I come to a stop at a red light I need to pull the choke way up to keep from stalling.

I told my mechanic all this, and he said that he suspected a hose going into the intake (my memory is spotty on exactly what he said) probably had come loose and that's why my engine is dying at stop signs and red lights. He said that he checked my hoses when he serviced the car last (in April) and there weren't any holes, but maybe one came loose. Well, my buddy and I checked and nothing is loose and there don't appear to be any cracked hoses. My buddy said there could be something wrong with my brake master cylinder.

I am hoping someone can help me out....maybe this is a common problem and you can point me in the right direction?

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Sure sounds like a brake booster (Nissan calls it "Brake Master Vac") to me. Very expensive new. Try to find one in a junkyard, craigslist part-out car, etc.

If it's an early '72 I believe it exchanges between 71-72, and if its a late 72 it may interchange with 73-75. I'm not entirely sure what the differences are other than i know the early ones were much smaller. I don't know if any of them can be substituted, but its possible.
2nd on the brake booster.... there is a vac line going to the brake booster under the hood, remove it & plug the vac line on the engine side...
Then step on the brakes ( now you will have manual brakes so I wouldn't DRIVE IT ) When you now step on the brakes, did the wooshing sound go away?

If yes , then you know the issue.. If your not a good mechanic.. I would consider having a shop do it.

Lk the booster. NK
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