C200 Brake pedal Juddering while braking (Fathers Car)

Tahir-Mehmet

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If anyone is able to help that will be fantastic.

My father recently had is wheel bearings replaced and a few days later he is now having issues with the brake pedal badly juddering while braking. And when harsh braking the back end kicks out quite badly.

There have been suggestions it could be the ABS pump (Expensive fix !) and I have also read in other places it could also be the calliper which has seized.

Any help will be fantastic!
 

LostKiwi

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Most likely the front hub surface where the disc mounts wasn't clean when the disc was refitted. That makes the disc run out of true and causes juddering.
Also check wheel bearing adjustment and lower ball joint for play.
 

mercedes13156

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Go for the cheap fixes first.

Get the wheels off and push / pull the hubs out and in. Sometimes the tapered races on the hub aren't knocked fully home. You adjust them up perfectly and drive for a couple of weeks. The act of cornering pushes the races fully home and all of a sudden you have 200,000 miles worth of play in the wheel bearings. Readjusting them solves that problem.

Get the disks off. Rust builds up around the holes in the front of the hubs where the disk and hub faces mate. I spent an enjoyable hour once with a wire wheel on a drill cleaning them off. If you don't fix this as soon as you notice it, the pads rub and wear the disks unevenly, so that when you do fix it, you have perfectly mated hubs and disks with "run-off" which will produce wobble and pulsating when you brake. Then you need to replace the disks as well as the pads which are also unevenly worn.

Now that the disks are off, get a block of wood to go into the caliper leaving about 10mm of clearance. Get someone to press the brake pedal without the engine on and check if both pistons move the same way. You should be able to push the pistons back by hand, or with a large G clamp. The wood stops you shoving the pistons out too far. You can sometimes free a stuck piston with Plus Gas or any releasing fluid. in behind the rubber gaiter.

It won't be the ABS pump. you'd get the message in the dash display if it was.
 
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Tahir-Mehmet

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Thanks @mercedes13156 & @LostKiwi took the discs off and they warped quite badly. Not sure what he has been doing! Replaced the discs and all seems to be good!

Thanks for all your help and advice very useful :)
 

mercedes13156

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Did you clean up all the mating surfaces before you put it all back together again?
 


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