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BMW 3-Series (E90 E92) Forum
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Bmw N52 stiff brake pedal and no vaccum???
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11-11-2020, 03:30 PM | #1 |
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Bmw N52 stiff brake pedal and no vaccum???
Hello everyone this is my first time posting on a forum so if i’m doing something incorrect im very sorry but i have a 2007 bmw 328i with the N52 motor. one day i was driving and my brake pedal went very stiff and i could barely stop. a few moments later it went back to normal. later that day the brake pedal went stiff again and did not go back to normal. i went under the hood and located my vaccum line from the vaccum pump going to the brake booster. i started the engine and took off the vaccum line only to realize there is no vaccum what so ever even with the engine started. there is a very slight vaccum but it is very slight. i took apart the vaccum line and made sure it had no cracks or leaks. Could this be my vaccum pump located under the intake headers? i have no idea where to start or what tests i can do. there is very little to none vaccum going to the brake booster. please help!!!
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11-11-2020, 05:43 PM | #2 |
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If there is little or no vacuum at the pump with the pipe completely removed, then the pump diaphragm is probably shot. Is there oil in the pipe?
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11-11-2020, 05:58 PM | #3 |
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There is alittle bit of oil in the pipe near the vaccum pump but it’s not a lot. Where should i go on from here? Do i replace the vaccum pump itself? a shop near me quoted me $1100 and i don’t think it’s worth it. i might DIY it but i don’t see any videos or threads explaining how to replace it myself. the vaccum pump is connected to the timing chain so i don’t think it’s going to be easy. my only issue is i don’t know if it is truly the vaccum pump or the brake booster?
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11-16-2020, 07:32 AM | #6 |
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Well then, sounds like you need a new vacuum pump.
$1100 is very reasonable. If you want to DIY it, you can save some money, but it is not a job for beginners. |
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328, bmw, n52 |
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