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Vibration Under Braking: Help Needed With Diagnosis

ausdrift
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ausdrift Experienced

ausdrift

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Hi all need some help. Car is r33 with many aftermarket arms/ suspension bits and tires are mid way through their life. I just got an allignment also. When i brake from mid to high speed with mid to high force i get very noticable shaking from the front.

What, specifically, could be the cause of this? Ie exactly what parts/conditions could cause this?

Thanks

GTSBoy Grand Master

GTSBoy

Posted
Posted

What is an upper spindle bearing? Oh and front left wheel bearing was replaced recently

Picture your front suspension in your mind. Think about which bits have to rotate with respect to which other bits, particularly when steering. The upper spindle bearing is at the top of the spindle, permitting rotation around a (near) vertical axis.

ausdrift Experienced

ausdrift

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Ahh, so the bearing which would attatch at the top of the knuckle? Thats a pain if its the problem. Would that be one which a shop would have to press out, same as a wheel bearing?

phantc_s15 Proficient

phantc_s15

Posted
Posted

Could it be tyre related? Quick check is to rotate front wheels to rear.

When I flat spotted my tyres (cold tyres with no ABS at the track) it caused huge vibrations when braking.

ausdrift Experienced

ausdrift

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The latest. After getting screwed around initially with the alignment by shop A, I took it to Pedders who were able to see that Shop A had aligned my car with caster settings of 3 and 10 to get it straight. Quite different from the 6 each side I asked for.

Pedders then showed me that it looks like the LCA bushes may be stuffed (as are the steering rack ones, they saw) as there was clearly something wrong from 1 side to the other there. I will investigate over the weekend, and its booked in with them for further investigation.

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