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No, just the wishbone...
The bolt being 10 times thicker than the wishbone
http://i1277.photobucket.com/albums/y486/05omegav6/Why%20polybushing%20front%20wishbone%20rear%20bushes%20is%20bad/IMG_20170408_143728_zpsqw5v2m4d.jpgApparently not
Picture in your mind, the ring that the rear bush sits in being snapped off completely causing the arm to bend forward where the front bush is located.
Now imagine this happening as you crest a bump in the road on a slight bend at around 130kmh.
If those cheapy ones haven't snapped your wishbones yet then there are 3 possible reasons...
1. you're simply not driving hard enough.
2. they are too soft to be useful.
3. you haven't found the cracks yet.
At least two of those statements are likely to be true.
Because this...Just don't poly bush the rear wishbone mount.
Why not?
... will happen.
In my case cresting a slight rise on a fast A road at around 75mph. With no warning.
As there was a suspicion that this could happen, I checked the arms weekly. They had infact been inspected only two days before.
So there you have it kids, just say no.
When the car has been switched off there is still a vacuum present which has enough power to keep the pressure in the system albeit for a short while.
I dont have climate control but when mine is off and I turn the direction dial, you can hear the flaps hissing then the vacuum dissapears.
Have you checked the rubber couplers on the vac lines?
any signs of cracking will contribute to vacuum loss
I have a line that has nearly worn through where it has been rubbing on the coolant bridge.
Or the diaphram in you hbv is nearing its usefulness and needs replacing
