BRE Fabrications LTD
Well-Known Member
Hey Guys,
In the last 3-4 months my 80 has developed a shimmy of sorts. It happens under very specific conditions and is easily repeatable.
My observations are:
1. When I'm on the brakes, slowing from any speed over 40mph, when I get down to 40mph a shimmy developes in the steering wheel. At around 35mph it goes away.
2. I can be doing 70mph on the freeway and then take an off ramp and while slowing down all is good but as soon as I get to 40mph the shimmy kicks in. At around 35mph it dissipates.
3. The severity depends on how fast I'm slowing down, the faster I am slowing down the more severe.
4. Under acceleration no shimmy occurs at any speed. If I am on the brakes at 40mph and the shimmy kicks in, if I let off the brakes the shimmy dissipates.
I have checked the following:
Wheel bearings for play (Wheel jacked up, hands at 12 & 6, no play whatsoever, I checked with hands at 3 & 9 as well (TRE's?), no play either).
Panhard bushes were replaced today, so they are good, old ones were a bit knackered.
All radius arm bushes were replaced in the last 6-9months (can't remember exactly when I did it last year, but I did).
I had my own set of castor correction plates made last year out of 4mm plate, they were a bit crap quality wise so I suspected these. Today I replaced them with a new set I had laser cut that are good quality wise. But still the shimmy is persisting.
I am at a loss with regards to what else to check. Any suggestions?
In the last 3-4 months my 80 has developed a shimmy of sorts. It happens under very specific conditions and is easily repeatable.
My observations are:
1. When I'm on the brakes, slowing from any speed over 40mph, when I get down to 40mph a shimmy developes in the steering wheel. At around 35mph it goes away.
2. I can be doing 70mph on the freeway and then take an off ramp and while slowing down all is good but as soon as I get to 40mph the shimmy kicks in. At around 35mph it dissipates.
3. The severity depends on how fast I'm slowing down, the faster I am slowing down the more severe.
4. Under acceleration no shimmy occurs at any speed. If I am on the brakes at 40mph and the shimmy kicks in, if I let off the brakes the shimmy dissipates.
I have checked the following:
Wheel bearings for play (Wheel jacked up, hands at 12 & 6, no play whatsoever, I checked with hands at 3 & 9 as well (TRE's?), no play either).
Panhard bushes were replaced today, so they are good, old ones were a bit knackered.
All radius arm bushes were replaced in the last 6-9months (can't remember exactly when I did it last year, but I did).
I had my own set of castor correction plates made last year out of 4mm plate, they were a bit crap quality wise so I suspected these. Today I replaced them with a new set I had laser cut that are good quality wise. But still the shimmy is persisting.
I am at a loss with regards to what else to check. Any suggestions?