brake judder still after new rotors and pads

[chapel gate]

lol...

id get worried if the pump starts spurting fluid out and the sensors start twitching on a cold dark foggy night on the moors in the workshop...

 

[StarCruiser]

This might be a bit out there, but it's not a rubber bush that's going soft or perishing is it? Perhaps on the axle letting it partially rotate under braking?

Just a thought.

 

[frank rabbets]

Did you fit genuine discs. You say OEM rotors and pads but don't mention discs.

 

[Chris]

Since when have rotors and discs been different things? It's an American term for brake disc. What you think a rotor is Frank?

 

[frank rabbets]

Ah sorry didn't realise he was American. Thought he was referring to ABS.

 

[Chris]

I think it's an odd term Frank. I don't really know where it comes from. Rotor? To me it means something like a shaft, perphaps the inside of a motor, but disc pretty much describes what they are in my book

 

[frank rabbets]

ABS rotor I had assumed. I had juddering braking when I had metal fragments on mine.

 

[chapel gate]

yes genuine pads and discs.

the mountain bike fraternity refer to discs as rotors. that's were I got it from, allways used to call them discs.

if its an Americanism I will wash my mouth out..

I have ABS no more on the car.

 

[pberrey]

Knackered radius arms bushes can cause quite a violent wobble under breaking but i wouldn't really call it a judder. So logically it must be your knee unless you are American in which case it's your rotors. I hope that helps ;-)


Sent from my iPad using Tapatalk

 

[chapel gate]

ah, im changing the front radius arm bushes to the ome caster correction ones this weekend. see if that makes any difference.

 

[Dave2000]

The feeling of the large flywheel being brought to a halt in (for want of a better description) 'drag and release' is invariably disc run out OR a variation in the disc thickness. The classic problem is a calliper piston/s stick and heat the disc up causing it to warp. You go out and fit brand new discs and pads and a short while later the problem returns, you put a dial gauge on (when the disc has cooled) and all looks good, ad infinitum. I would get the discs hot and try braking gently with your hands off the steering wheel and look for the wheel rock to and fro, pointing to the 'drag/release' scenario. Steering/suspension bushes once loaded under braking do not release and recompress unless the brakes are in effect being applied and released. Tyres can cause the same feeling if they are going out of shape under the load of braking, perhaps after standing or having experienced some internal damage, JME.

regards

Dave

 

[Chris]

Agreed. I have never had one only distort when hot though. I've done a couple and once warped they stayed warped. I did one on the way to Lincomb once. Came to the island on the A38 and anchored up very very hard. I later found the opposing pistons in one cal weren't working and it just rippled the disc in one go. Had peddle bounce all the way there and back. Real pain.

 

[chapel gate]

ill put a dial gauge on and confirm there warped or not and go from there.