Brake judder - ScoobyNet.com - Subaru Enthusiast Forum

Notices
Wheels, Tyres & Brakes
Sponsored by:
Sponsored by:

Brake judder

Reply

 
 
 
Old 09 August 2018, 12:00 AM
  #1  
flossy1903
Scooby Newbie
Thread Starter
 
Join Date: Mar 2015
Location: dumfries
Posts: 3
Default 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

flossy1903 is offline  
Reply With Quote
Old 09 August 2018, 10:40 AM
  #2  
ST-X
Scooby Regular
 
Join Date: Oct 2012
Location: United Kingdom
Posts: 204
Default

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.
ST-X is online now  
Reply With Quote
Old 11 August 2018, 10:19 PM
  #3  
big keith
Scooby Regular
 
Join Date: Mar 2004
Posts: 107
Default

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.

big keith is offline  
Reply With Quote
Old 13 August 2018, 10:51 PM
  #4  
flossy1903
Scooby Newbie
Thread Starter
 
Join Date: Mar 2015
Location: dumfries
Posts: 3
Default

Had brake discs skimmed it was fine for about a month then started juddering again, car has only down 12,000 miles
flossy1903 is offline  
Reply With Quote
Old 14 August 2018, 01:37 PM
  #5  
alcazar
Scooby Regular
iTrader: (2)
 
Join Date: Jun 2002
Location: Rl'yeh
Posts: 40,563
Default

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.
alcazar is offline  
Reply With Quote
Old 14 August 2018, 05:51 PM
  #6  
johned
Scooby Regular
 
Join Date: Jan 2010
Location: derbyshire
Posts: 1,866
Default

I have a similar problem so will be interested in the outcome.
johned is offline  
Reply With Quote
Old 14 August 2018, 11:49 PM
  #7  
flossy1903
Scooby Newbie
Thread Starter
 
Join Date: Mar 2015
Location: dumfries
Posts: 3
Default

Standard discs and pads fitted.
flossy1903 is offline  
Reply With Quote
Old 15 August 2018, 02:49 PM
  #8  
Linksfahrer
Scooby Regular
 
Linksfahrer's Avatar
 
Join Date: Dec 2013
Location: Hochstadt
Posts: 451
Default

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.
Linksfahrer is offline  
Reply With Quote
Old 18 October 2018, 11:34 AM
  #9  
Rusti
Scooby Regular
iTrader: (2)
 
Rusti's Avatar
 
Join Date: Sep 2014
Location: Hampshire
Posts: 773
Default

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?
Rusti is offline  
Reply With Quote
Old 18 October 2018, 12:05 PM
  #10  
hedgecutter
Scooby Regular
iTrader: (5)
 
Join Date: Sep 2010
Location: far, far west
Posts: 1,711
Default

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 .
hedgecutter is offline  
Reply With Quote
Old 18 October 2018, 12:18 PM
  #11  
Linksfahrer
Scooby Regular
 
Linksfahrer's Avatar
 
Join Date: Dec 2013
Location: Hochstadt
Posts: 451
Default

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.
Linksfahrer is offline  
Reply With Quote
Reply
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
JamesS
Wheels, Tyres & Brakes
2
19 October 2001 12:36 PM
detheridge02
Wheels, Tyres & Brakes
5
30 August 2001 05:59 PM
CRAFT
Wheels, Tyres & Brakes
2
20 March 2001 11:54 AM
Berkeley
Wheels, Tyres & Brakes
3
24 February 2001 10:10 PM
Hoppy
Wheels, Tyres & Brakes
10
12 September 2000 11:45 AM

Forum Jump

Thread Tools
Search this Thread