Brake Judder but only on gentle braking

T

thedumpster

New member
Hi folks, dont know if this has been covered before but need some help. I've recently developed brake judder when braking gently, but it disappears when you brake harder. I can feel it through the steering wheel so its coming from the front. I was told there was some crap under one of the brake pads and had them replaced but it hasnt helped. Am I looking at a warped disc or something more sinister, any ideas?
 
welcome to the forum.

Have you beded the new pads in by warming them up then doing 3 stops from 60 to almost zero withouth stopping then driving a while to cool them.

Beds the pads and removes and residue off the pads. If that doesn't cure it then you need to start looking a trunout on the discs, tyre pressure, ewear in the suspension, etc, etc.
 
Could be as simple as a sticking caliper or sticking piston. When the pads were replaced were the calipers cleaned up? The next thing to do would be check the rotor for run out. A goof brake shop would have done both when installing the pads...I would go back to whoever did the pad replacement and ask if they serviced the calipers and checked the rotor thickness and run out.

When new pads are installed the pistons get pushed back into the bores by the mechanic to allow room for the thicker new pads. If the piston seal area is not cleaned before they are forced back then you can end up with a sticky piston and get results similar to those you are experiencing when lightly braking.
Calipers can get hung up on corroded pins. Normally the pins get cleaned up or replaced before reassembly of the caliper to the carrier. Neither of these service items are difficult or time consuming but they are often overlooked.
 
Hi there, I had a similar problem and measured the run out on the discs and they were all fine, it turned out to be failing torsion bar bushes, quite cheap to replace and got all of mine done by BMW spcialist. My zed is about 8 years old.

I hope this helps you.

Kim
 
Thanks for the input folks, been meaning to take it and get it sorted for a couple of weeks so its time to bite the bullet!! :D
 
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