tangcoral

I just changed my 1990 ls400 front rotors and break pads to the brembo blank and pads cause before, it vibrated during hard braking on highway.

However after the install it does indeed vibrate less but its not completely gone.
Is there something else I should be looking at to eliminate the slight vibration...

ALSO:
Vibration also occurs when I am traveling at low speeds from 20MPH to STOP, it vibrates very softly and at longer durations then on freeway (obviously), but again it has decreased substantially just not totally..

Please help and thank you in advanced.

PureDrifter

iTrader: (10)

do you feel the vibration primarily through the seat/floor or through the steering wheel?

general rule of thumb is that if its the steering wheel the front end is imbalanced/warped

if you feel the vibration its the rear.

tangcoral

goodness...I feel the steering wheel and slightly througout the car as well..what does that mean?
And when you say warped, are you referring to the rotors only or something else can be warped?

Also when you say front end is imbalanced? what part of it is imbalanced?

Please note the vibration is very slight. Maybe I am just over sensitive.

avalon42

iTrader: (1)

I would check to see if the tires are properly balanced and the wheel alignment...

PureDrifter

iTrader: (10)

if the vibration only happens under braking then the rotors are likely "warped"
if it happens consistently and changes with speed, then its imbalanced tires and/or improper alignment

L_Sport

I agree, if it only happens during braking then that rules out alignment and tire balance.

tangcoral

Yes it is only under braking.

PureDrifter

iTrader: (10)

check the rear rotors for runout.

you DID install shims on the pads right...

drifto808

it also could be your bushing in your front suspension components..i ran into those a couple of times..just check your bushing if they are cracked..

PureDrifter

iTrader: (10)

it is possible but most bushing vibration issues act like wheel balance problems, and dont normally show themselves only when braking..

Bill Dowd

I had the same problem and found that my front ball joints were shot this might not be your problem but if the car is raised off the ground pull up on the front tires and see if you have any play if not the ball joints probably ok.

trukn1

ran into the same thing with my 92. did pretty much the same things you did and found it was the beginning of my lower ball joints going bad. First gens are notorious for eating them up. Have them checked.

DIY LS400

+1 for ball joints.

UCF11

Ball Joints!!! Tie rod ends!

demonboy

I am having the same problem with my '91. Thanks for the advice everybody, this has been helpful.