wobbly car on hard braking??

jazz · 05-26-2012, 01:49 PM

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.

2004YZFR1 · 05-26-2012, 03:50 PM

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.

PapoZalsa · 05-26-2012, 03:58 PM

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....

Haulnz · 05-31-2012, 01:14 AM

Quote:

Originally Posted by jazz

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.

Did you bed-in the brakes properly ?

LakeShow · 05-31-2012, 04:03 AM

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

DjSquall · 05-31-2012, 05:17 AM

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

UNKNOWN_370 · 05-31-2012, 05:48 AM

Quote:

Originally Posted by DjSquall

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.

Mt Tam I am · 05-31-2012, 09:29 AM

Quote:

Originally Posted by jazz

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.

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

This is my new problem.

DjSquall · 05-31-2012, 09:42 AM

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?

kenchan · 05-31-2012, 10:01 AM

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.

nissan_fan · 05-31-2012, 10:28 AM

Uneven road surface.

SPOHN · 05-31-2012, 10:56 AM

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

TerribleONE · 05-31-2012, 11:31 AM

Quote:

Originally Posted by SPOHN

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

houkouonchi · 06-01-2012, 02:40 AM

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).

SPOHN · 06-01-2012, 06:24 AM

Quote:

Originally Posted by TerribleONE

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

05-26-2012, 03:50 PM	#2 (permalink)
2004YZFR1 Enthusiast Member Join Date: Apr 2010 Location: Las Vegas Nevada Posts: 308 Drives: 09 370Z yellow,auto Rep Power: 16	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. __________________ K & N Filters \| HPS silicone air intakes\| Fast Intentions CBE with 18" resonators \|

05-26-2012, 03:58 PM	#3 (permalink)
PapoZalsa A True Z Fanatic Join Date: Nov 2009 Location: Not in Sunny Florida Posts: 6,358 Drives: 16 Nismo w/Tech Pack Rep Power: 4500	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.... __________________ 2009 370Z MB Base w/Sport Package 6MT Modshack's Custom Air Intakes /3M Clear Bra/ Illuminated Kick Plates / F. I CBE w/12" resonators / EVO-R Front Lip / Rear Hatch Wing / Tein S-Tech Springs /Ilegal Tint in the Rep. of VA/4x20mm Z1 Spacers/ Vinyl Roof/Liquid Carbon Designs

05-31-2012, 04:03 AM	#5 (permalink)
LakeShow A True Z Fanatic Join Date: Dec 2010 Location: L.I., NY Posts: 5,307 Drives: Everything Rep Power: 26	Definitely inspect your whole brake set up. Shouldn't be wobbly at all. __________________ \|2013 Audi S4\|Ibis White/Black\|S-Tronic P+\| \|2013 370z\|PearlWhite/Persimmon\|Touring/Sport/Nav\|F.I. CBE 18" CF\| \|Sold\|2011 370z\|Gun Metallic\|Touring/Sport/Nav\|

05-31-2012, 10:56 AM	#12 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 222	Everyone has suggested great ideas to look for. Also do you have hub centric rings? __________________

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05-31-2012, 05:17 AM	#6 (permalink)
DjSquall A True Z Fanatic Join Date: Apr 2010 Location: Tottenham, ON Age: 37 Posts: 1,340 Drives: My first car Rep Power: 23	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

05-31-2012, 09:42 AM	#9 (permalink)
DjSquall A True Z Fanatic Join Date: Apr 2010 Location: Tottenham, ON Age: 37 Posts: 1,340 Drives: My first car Rep Power: 23	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?

05-31-2012, 10:01 AM	#10 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	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.

05-31-2012, 10:28 AM	#11 (permalink)
nissan_fan Base Member Join Date: Feb 2012 Location: PR Posts: 123 Drives: 2012 370z PW M6 Rep Power: 14	Uneven road surface.

06-01-2012, 02:40 AM	#14 (permalink)
houkouonchi Enthusiast Member Join Date: Jun 2010 Location: Ontario, California Posts: 440 Drives: '14 GT-R '10 M6 370z Rep Power: 15	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).