BenzWorld Junior Member
Date registered: May 2008
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'75 240D- lost vacuum to brake booster and locks.
Previous symptoms were, locks getting very slow to function and not holding pressure very long after shut down and 1st to 2nd shift very hard if driven right after start up.
On freeway trip home, vacuum loss, no booster under braking on offramp, luckily no traffic or bad conditions.
Actuators function in both direction with hand vac pump, disconnected line to booster, had slight hiss on removal, seems like it held pressure, check valve in booster/lock line functioning properly. Almost no vacuum draw on booster/lock side of vacuum pump.
Car does still shut off and trans seemed the same even after failure.
Will a vacumm pump rebuild be in order and why would it effect only one side.
Last edited by 911s55; 05-16-2008 at 09:10 PM.