Shaking / Rattling While Braking

[MaccaD2191]

Hi I'm having an issue with what I think is my brakes, I can feel a sort of shake or rattle coming from my brake pedal when I brake heavily from a high speed. I'm not sure if it's my brakes, suspension or any other issue such as a loose part along my axle. It feels like it could be coming from the front end but I'm not entirely sure.

Just wondering if anybody has some advice on what I should be looking around, I drive an R34 25GT.

Thanks in advance for any help

[GTSBoy]

More than likely it is pad material stuck in uneven patches on the brake rotors. A brisk rub with emery paper on all of the rotor friction surfaces (probably only at the front) should help.

[Plattsy]

yea visually inspect your discs as well mate. could need machining.

[blind_elk]

Could be ABS.

[MaccaD2191]

Thanks, I'll check them out on Sunday when I service the car

[rondofj]

I have the same problem- front end shudders /vibrates under high speed braking. The other thing is a bit of 'sticking' on very low speed 1st and second gear upon initial start and go and then it goes away after a minute or two of driving.

Im thinking its the cold uneven rotors causing this, once it warms up a bit then its fine, am I wrong??

[MaccaD2191]

Nah it only happens under high speed braking, it wouldn't be because they are cold in my case, because I drive for about 20 minutes through town until I get out of town on my way to work. Then there's a couple of long straights where I really get my speed up. So they should of warmed up by then.

I had a quick look at my rotors and they look pretty smooth, haven't had a good chance to get my wheels off and have a proper look yet though.

[Cadmoon]

My bet would be warped rotors, does the shaking get worse the harder you brake?

[MaccaD2191]

I donno haha I usually try to ease off so I don't do damage or feel it as much

[Cadmoon]

Well I have had it on my old car and my current R33, new rotors fixed it good as new.

[rondofj]

Is it possible for the brake pad bits to be pressing against the rotors to cause initial stickiness? Then once you start driving it wears off and becomes 'normal'?

[rondofj]

As GTSBoy says I might get some emery paper and wipe the front rotors a bit.

[MaccaD2191]

If the brakes were sticking at start up, then it would be the rears because of the handbrake being applied. That's what I would think anyway

What's the average cost of getting rotors machined or fixed up? I was looking at getting an upgraded brake kit, but I wanna wait until I have my new rims first

[blind_elk]

When I said:

Could be ABS.

I meant it could be the ABS actually working.

Generally, most other "problems" mentioned in previous posts cause a vibration up through the steering column. ABS generates a pulsation through the brake pedal as the unit continuously applies / releases the brake pressure.