wobbly car on hard braking??
 

just did a full wheels and trie upgrade with wilwoods BBK...i am now pushing the car harder then i have ever did last year! i am now feeling that the car is ou of control when i do very hard braking (160km down to 50km) what is this??

any help would be great!

thank you.

Have you called Wilwoods and asked them about it? My car is stock with the sports package and has on pulled hard to the left on high speed braking occasionally. I almost pooped my pants the first time it happened.

You have all new nice brakes and wheels, you shouldn't have any problems.

Have you tried rebleeding the brakes and double checking your tire pressure?

Good luck and let us know what you find.

Are those 20" rims? Maybe they need to be rebalance....

Brake lines and fluid?

I don't think you messed up the rotors that quick.... :confused:

Did you bed-in the brakes properly ?

Definitely inspect your whole brake set up. Shouldn't be wobbly at all.

It could be your wide wheels reacting to uneven road surfaces. Took me a while to get used to it, once it threw me across a lane on the 401 lol

AKA tramlining. And 20's don't sit well on our cars for high performance driving, so expect a loss of positive performance. But I would also check the brakes and balance as well just in case there is a resolution to some of what you are experiencing.

Does it feel like the steering wheel is vibrating, while braking in a straight line?

This is my new problem.

If the steering wheel is vibrating while braking, your rotors are probably warped.
If its vibrating while driving, it's unbalanced or flat spots or bent rims.
If you're doing hard braking and get pulled to the side, find a smoother road to slam the brakes!

Btw, who needs brakes anyways? :D

could be pads, rotors, alignment, dampers, wheels, tires. one of the problems with messing with the suspension and running aggressive offsets & wide low profile tire is it is more prone to tramlining while braking.

i suppose if you have the time to mess with it, should be a fun experiment, but the stock sport brakes and suspension is more than adequate for me. not messing with it.

Uneven road surface.

Everyone has suggested great ideas to look for. Also do you have hub centric rings?

:werd:

Just today a guy changed lanes with obviously not checking over shoulder or mirrors that good. I was going around 75 and he was going probably 60 in the slowest lane (going one lane over). I was accelerating planning to keep merging left.

Well he started merging into my lane (pretty fastly too) and i had to completely slam on my breaks to avoid hitting him. He also started breaking (but didn't immediately go back in his lane?) so I slowed down from 75 to about 35 mph as I had to down-shift into second after he finally did get over ( he never went back to his own lane completely).

Any other car I think I would have hit him. Not only did the ABS activate but I heard my tires screaching. Very few times have I had to slam on my breaks especially at those types of speeds. Car's behavior was completely normal though (did not wobble or pull in one direction).

Care to explain? I've had issues with hub centric with this same issue. But what do I know.

BTW, do you have spacers?

i only have 400km on the new wilwood brakes and new tires...no bent wheels, no flat spots no spacers, no centering rings.. i did rebleed the lines! no better?? at low sppeds it fine....i have the issue over 130km flat on uneven roads seem to feel the same??

do you think it could be a blown strut? or shocks??? and the car under hard breaking is becoming unbalanced??

yes, i did...to the word!

I think is the 20" rims like someone already point it out. That is why I will stay with 19" even that the tires are more expensive.

wow, nice car! how do you like it?

it's wobbly...

oh..

Hahahaaaaaa..... thank god for sport pkg and stillen brake cooling kit. Lol

Perhaps you're blaming the brakes for normal vehicle dynamics. Brake hard while slightly turning or cresting a hill and the back end will squirm. It's just a matter of the braking causing forward weight shift and the back end getting light. Happens all the time on the track if I'm braking for a corner from a dogleg straight.

And everyone please stop blaming wheel spacers for your problems. I've run spacers on my car for two years and multiple track events without a single hiccup.

1.Dissassemble brakes, resurface both rotors and pads using sand paper then reassemble and performing bedding procedure. I usually do 40mph to 20mph quick braking(do not lock up ABS) 3 times then follow with at least 2-3 60-30mph quick braking to bed.

2. If your running very wide tires they will obnoxiusly tend to pull to the lowest point in the road no matter what you do, keep this in mind.

3. It is possible that your alignment may be out, there are any number of reasons that could cause it but probably noting that your car is new the tow/camber may be slightly off kilter. This is the last thing Id check as seeing as you just had the brakes and rims installed your problem more then likely rests with one of those two.

This would sound about right.

my guess is its 20 inch tires

its was a loose rear control are!! the lock nut wasnt locked and had moved! car is feeling much better? could of also been wax on the tiresas now i have 500km on them...

Did you over tighten lug nuts?

Bed in brakes properly???? Also if you over tighten the lugs it can cause warpage.

its was the camber on the rear tires/control arms plus new tires with wax on them! adjusted the camber and it feels good! no issues as of yet!