Hi HighG, welcome to the forum.
Driveshaft knock is more pronounced when cornering, i.e. moving slowly at full lock in an empty car park.The knocking you hear, is it just one knock, and how substantial does it sound? Assuming the garage tightened everything up correctly and did not cause any damage when they jacked the car up, it could be the pads moving in the carrier. The pads will normally move slightly but an aftermarket brand could have greater tolerance and simply be moving up against the carrier but there would be movement in both directions. If you move forward, brake and "knock", is there no noise at all if you then reverse and brake in the same manner?

 

I have just had the front discs and pads replaced on my 2011 2.0D 110SE model by a local garage, and the next day they have started making a knocking noise under braking - only in forward motion...

Once when the brakes are applied or a continuous knocking while braking?

Also can you feel any uneven grabbing whilst braking?

 

Sorry I should have said.Yes its a continual knocking noise while braking, I think basically as there is each revolution of the wheel you get a knock. Only happens when braking, sounds fine when driving normally.
There doesn't appear to be any fading, or like the steering is grabbing to one side due to uneven brake application. Again strangely it doesn't happen in reverse...
I can only imagine it is a servo or ABS issue as the new pads should seat themselves aftera day or two and its been over a week since the problem started!

 

What make discs and pads did the garage fit?It sounds very much like the pad moving in the carrier.

 

Unfortunately I don't know what make were fitted, and Ican't really find out for a while. Is therea way that I can test if it is the pads moving in thecarrier?
If this was the case, would this not happen when moving in both directions - not just forwards?

 

They may have forgotten to replace the ant-vibration clips (if there are any on the Yeti?) in the callipers.

 

If this has happened since the front pads were fitted I would assume it's to do with that.Even though it could be something else, I would say this sounds like pads moving in the calipar.When the pads are fitted they should be a firm hand fit into the carrier with a little coppa grease on the edges of the pads to allow free movement.They should not be hammered into the carrier and they shouldn't be ground down to the extent they are a slack fit.
I don't know what make of pads you have fitted but if I were fitting them the first thing I would do after removing the old pads is clean the carrier thoroughly where the pads slide.Then coppa slip the pad edges sparingly and apply some on the back of the pads to avoid squealing when calipar piston pushes against the pad.When first fitted the pedal is pumped to bring pads up against the disc and then they need a time where they are bedded in to bring up to max efficiency.

It may be the pads have been ground too much to fit and are loose which would normally create a rattlewhile drivingand a clunk when braking but if the pads are withdrawing back too far when releasing the brake pedal then it could be a master cyl issue where it's letting pressure off allowing the pads to move back too farfrom the discs.

Edited by: ydoakstie

 

Is therea way that I can test if it is the pads moving in thecarrier? If this was the case, would this not happen when moving in both directions - not just forwards?

If that was the case you'd usually get a knock on first application of the brakes not with what seems to be each rotation of the wheel.

That seems to me to be more like a cracked disk.

 

wonder if they have dropped a disc and made a small "ear" on the edge which is catching the pads, but that would make a noise in both directions and wear off after time.

 

Sorted - Thanks everyone.So the result was the dealer changed the pads to skoda genuine (which may or may not have been to problem - or just badly fitted) and the noise has gone. So it seems it was just movement of the pads in the carrier.
All I can think is that I couldn't get up the speed to adequately hear the noise in reverse, which is how it only presented in forward motion. Certainly one to watch in future for me.

 

I couldn't possibly comment on the motor trade as I worked closely with them all my life.

(e&oe!)Glad you got it sorted out.