Vehicle & Technical > Discovery

breaking clonk

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muddyjames:
when ever I break even at very slow speeds I can hear a clonk from the drivers side wheel area. I cant hear it at high speed. IT is even there when I am on tick over crawling along. It clonks then no more clonking until I next apply the break. anything to worry about?

Thrasher:
Loose brake pad?

muddyjames:
how do I check them? Is it just a case of wiggling them? I am guessing it isnt adviseable to drive it if it could be that.

Tyke:
Hi Muddy,

Loose brake pad could be the cause, the calipers wear and eventually allow the pad to move around and slip down the caliper. I've had them get so bad that the pad slips right down the inside of the caliper and ends up rubbing on the wheel hub. Best to jack the wheel and give the pads a good a poking with a pry bar. Check they are sitting where they should in relation to the tabs on the pads. If they look a bit low you can asume the caliper is worn and will soon need replacement. They do click when you brake if they are worn, they also tend to rattle a lot and thats the usual give-away sign.

Another thing to check is the lower shock mounting bushes and fixing security. If the bushes are softened and worn or the fasteners are not tight enough they allow the shocker to move in the axle mounting plate. I've recently had this happen on mine and only discovered it when I had the suspension stripped to fit a set of polybushes.

It gave similar symptoms as you describe. i.e. a 'clonk' when braking. The mounting hole had actualy worn oval so it had obviously been wearing for some time. Again you will need to take the weight off the suspension to check it and a pry bar between the bottom fixing nut and shock mount will show if the shock is moving. I'd check the fixing at the top of the turret as well, just to be on the safe side.

muddyjames:
Thanks for that. I had my suspension replaced all round early this year so I am thinking it may not be that but I will check anyway.

From what you say about the caliper though............ I span the wheel whilst changing it today in the rian (again) and I could hear the pads grinding on the disks. I only replaced the pads about a year or so ago. I think you maybe heading in the right direction. I will take the wheel off again tomorrow and have a fiddle.

Or maybe in a few mins if i get bored!

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