Hard Braking = Vibrations through pedal and audible from front of car

Machine the front disc rotors if the they have enough thickness on them

Edit: actually re read your thread, actually sounds more like abs coming on.
If the disc rotors need machining they will also start to vibrate at moderate levels of braking also

 

Sounds like ABS to me, its what it is meant to do.
when you brake hard You feel a vibration through the pedal strong enough to push your foot back and forward.
I would say 99% it was ABS kicking in.

many people wonder the feeling even i was like WTF IS WRONG first time but when i went on the defensive driving course they explained this and said it is very normal.

Actually many people think something is wrong and let go ending up smashing into something.

I wouldnt say it was your discs.
when you brake lightly does your car wobble? if not then its not the discs.

 

Had the exact same problem caused my rotor runout, my rotors had heat spots all over them. Machine the rotors or buy a new pair and your done.

Lol it's got nothing to do with your ABS.

 

ABS only functions when the wheel has come to a complete lock, The ABS module then kicks in to unlock then lock and so on, The ABS is controlled by a sensor on the wheel hub that detects a completely locked wheel. It will not cause this pedal issue until you have locked it. Id say you have warped rotors this can cause pedal feed back, i had it with my vy with warped rotors, i would only get shudder with heavy braking not light braking, usually from 110 to 60 while pulling off a freeway.
Replaced them with some RDA rotors and new pads for $130

 

Brake shudder from hot spots on the rotors.

DONT machine your rotors. Buy new DBA or RDA rotors. The stock ones will just burn up again.

 

machining rotors is a waste of time/money, better to buy new ones.

 

If its not doing it at low speeds its not the rotors. It does sound like the abs kicking in.
Go jump in your car and SLAM on the brakes, enough for abs to kick in and let us know if thats what you felt

 

Hot spots on rotors don't generally vibrate at low speeds, unless your rotors are warped.

 

Roady's only check for minimum thinkness, if it's above this then it passes.

The abs only unlocks the wheels when it locks up on hard braking. Lock, unlock, lock, unlock. That's how it's designed, google it if needed.

A good test to see if it's hot spots, take the car when been undrivien (good test is from overnight) and take it up to speed with minimal braking then brake (not hard, not gentle) if nothing then it's hotspots, if vibrations, then it's warped rotors.
This method tests a cold braking system

U can test this after city driving/lots of braking, when the rotors are hot, the hotspots appear and u'll feel it.

 

I'm sorry but some people are so silly, I can almost guarantee that was you felt was abs.

Especially since you can't recreate it with light/medium braking at lower speeds.

 

Not the case anymore they do a brake test with every roady now so and have to take pics of the brakes to fine with the roady that's part of the reason the price went up for a roady lol but it does depend how long ago that was but I'm tipping it was only abs if this is his first time in a abs car were his jumped on the picks hard enough to activate abs.

 

I take it you have had alot of ABS problems in your vehicle(s)!

If he's ABS was at fault, it will also occur at light speeds.

To the OP, take your car to a reputable brake specialist and get them to perform a rotor runout check on your rotors. This will show if your rotors have generated heat spots from overheating or warped as alot of people say.

I highly doubt there warped unless you ALWAYS feel the vibration and shudder.

 

Yes they do a brake test, but if the car sat there and cooled down or the brakes weren't hot, the hotspots wouldn't have expanded and thus wouldn't be felt, giving the all clear with the brake test.

The OP mentioned he braked hard to slow down and mentioned nothing about skidding

 

My ABS works fine but I have ha quite a lot of experience with ABS on the defensive ad advance driving courses I have been on.

 

I had the same problem on my VT i replaced my rotors and brake pads in the front and it is ok now.
My rotors were warped.
Don't machine your rotors it's a waste of money, you can pick up Dba rotors and bendix pads from super cheap for around $220-

 

Brake tests were around before the new rules came in. They're do do with the efficiency of the brakes more than anything.

 

Have you had experienced with warped/glazed/hotspotted rotors?

 

i doubt it, he sounds 17, with his first car ever. and only done a defense driving course where they make him ingage ABS.

new rotors are cheap as chips anyways, and it would most likey be the problem.