Ive had this 90 Civic Si for a little over a year now, Just a few weeks ago I noticed that when I go over 70Km/h and hit the breaks, the car starts to vibrate... I immediately thought warped roaters, but they look perfectly fine, there was allot of dust in the back drums, but getting rid of that didn't solve the problem, all the shoes look fine.

I really have no clue what it could be, and am looking for ideas from you guys for a fix. I can feel the vibration in the pedal too, its not a super violent shaking or anything, but the faster you go, the more noticeable it is.

Thanks.

 

Since you can feel the shaking in the brake pedal as well as the steering wheel its safe to assume that it has something to do with your braking system.

You mentioned that you checked the front rotors and said that they look fine, did you do this visually or with the use of a dial gauge or micrometer? You also mentioned that the rear shoes look fine, however, you did not mention how the drums looked. To rule out the rear drums as the problem, try driving around a parking lot slowly with the parking brake slightly applied, check for any shaking or vibrations.

When was the last time any type of brake service was done?

 

Used a dial gauge to check the front roaters, they are well within the allowed limit. The drums look fine, but I'm considering replacing them anyways, just in case...there pretty cheap anyways, No break service has been done by me, when I purchased the car all the breaks were perfect, so I left it as is.

 

Well with the rotors you would need to check in 4-6 spots to check it for warpage. And you would need an inside micrometer to check your drums. Those might be the problem, if your not sure take it to a shop and ask them to measure it for you to see.