Brake judder
 

Recently got a 2014 Sti with only 10k after a month got a front brake judder as steering wheel vibrates under heavy braking, had discs skimmed and its come back, everything nice and clean, had same problem with previous 2011 Sti it needed a front near side wheel bearing as had a run out on hub, also lots of brake dust on wheels anyone else getting brake shudder problems??

Many thanks

Knackered bush? I've had brake judder and shake before which I eventually tracked back to a worn front LCA bush that was massively exacerbating a tiny amount of judder at the pedal but I've also had it when the brakes have been absolutely fine once the bush was replaced.

think you would be better buying new discs .have you checked the run out with a dial gauge should be know more than 003 thou.Also are the discs genuine Subaru or cheap chinese crap.

Had brake discs skimmed it was fine for about a month then started juddering again, car has only down 12,000 miles

Tell us what calipers, discs and pads are fitted?

Brake judder is almost always down to deposits on the disc, rather than discs being warped.

I have a similar problem so will be interested in the outcome.

Standard discs and pads fitted.

I had this problem , and found I was warping the disks , even the new ones I put on. I found two issues.

1. The Calliper's were seizing due to corrosion on the pistons , which I cleaned up I replaced the discs at the same time and things were fine no more vibration / shudder.

2. About two weeks later it happened again, after pulling off from the motorway and standing on a slight hill with my foot on the pedal. I know this is not a good idea , but I was only doing 80 to zero once.

So this time I replaced the cheapy discs with some standard ones from TRW which seem to be well tempered and reliable for a normal WRX driver.

I should note that I don't use these discs all the time , but only put them on a for a week or so before the TÜV and take them off as soon as I can afterwards. I use a twin Hat type , a disc that floats on a hub , its a big brake conversion from Godspeed. The car now runs well over 300bhp so I would be in trouble if I used the standard discs.

I would like to pick this up again as I am having judder on new pads and discs, came with the car so no idea what they are, but probably cheap.

They were replaced as the dealer noticed judder when driving the car, this leads me to believe its a Bush not the brakes, thoughts?

If you drive in areas where you get mud deposits on the brakes, you can get judder. This happened to me with sticky chalk mud. However, the discs that I bought afterwards from a ex trader on here where warped from new. So, plenty of causes .

If this is occuring when you make even a light brake application then it can only be warped discs, Typically the caliper Pistons pickup brake dust and cause the steel pistion to pit and corrode , when that happens one side /pad is presured faster onto the disc , an unequal heatiing can occur that promotes a warp, one side of disc is heated the other not. Then particularly if you Keep your foot on the brake , while holding roll back on a hill after a motorway decellaration. The warp can occur. It might anyway if the discs are of poor quality.

Until you Service the calipers you won't know root cause, but if you find one Piston is sticking ist a sure sign, and it pays to re-furb them before fitting the good replacement discs.(TRW are good) While you are about it , ( flush your lines ) and some RBF Dot 4 is a great help.

Standard Bushings are always going to soften over time, and if your car feels a bit loose through the Apex and you find yourself correcting steering angles then they are well worn and should be replaced. If your car is 10 years old , I'd do it anyway. Remember though if you use Nylon, it will transmit more noise and Vibration into the car, I used Power Flex myself , but Whiteline also do a kit, and I'm sure as alternative to Subaru other mfg's also exist.