vacuum hose collapse for brake booster .. Is this suppose to happen ?
My car has a manual transmission.
No it is not supposed to collapse. The hose has most likely got soft from oil or other contaminants and should be replaced. If you find the hose has fluid in it and it is brake fluid, then your brake master cylinder may have got brake fluid in the brake booster and hose and parts should be replaced if this is the case. If only the outside of the hose got oil soaked then replace the hose and repair oil leaks as needed.
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