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Knock when braking


wimpus
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Hi all, 

 

Since as long as I can remember have a knock sometimes when I brake.

Now its nearly everytime.

Begin september changed the drums and shoes (cant remember if I had it before or not.. ).

 

Shoes are adjusted the right way, springs and shoes also the right way in.

Wheel cilinders is a few years old.

What could it be ? 🤔

 

Not tried it yet with the handbrake cable removed.

 

Yesterday evening noticed when I got the handbrake on and drive off. A knock when applying the brakes the first time, after that all good.

 

Or if you stop, drive backwords, then forwards and again like above, first brake after driving forward.. knock.

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9 minutes ago, Nick Jones said:

Are the bolts holding the backplate tight?

Nick

Will check.

 

Shafts where also renewed in 2018 (I think it was) with fully rebuild assembly's from TD Fitchet.

 

Also checked the trunnion bushes, seems no play now (1 had a bit of play as bolt not very tight ).

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sounds like the HB cable is holding the shoes open 

dont let the axlles hang, disconnect the HB cable  firmly lock up the adjusters   set the cable to a nice fit , no tension and then de adjust to free the drum

wear in the back plate hb pivot point can restrict the cyl from sliding 

but this just sounds like shoe shift knock 

Pete

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19 minutes ago, Pete Lewis said:

sounds like the HB cable is holding the shoes open 

dont let the axlles hang, disconnect the HB cable  firmly lock up the adjusters   set the cable to a nice fit , no tension and then de adjust to free the drum

wear in the back plate hb pivot point can restrict the cyl from sliding 

but this just sounds like shoe shift knock 

Pete

Will check the back plate to.

But did grease up the habdbrake lever + wheel cilinders so it all slided good.

 

Will check the cable, did got it a bit more loose yesterday + greased up the handbrake cable guides.

 

Maybe best to degrease them all good and apply some grease.

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4 minutes ago, NonMember said:

Lots of good advice above. Just to add, a knock like that can, sometimes, happen if the rear spring bushes are worn, although that tends to also happen on pull-away.

New spring was fitted at the end of july as my previous one said 'bang' (bottom leaf broke).

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This morning took a look.

Right side all ok.

Left side found out the wheel cilinder moved more..

 

One of those 2 sliding/hold down plates had gone missing, so thats why the cilinder moved and made de 'knock'.

 

Lucky I never trow away old fitting kits etc (keeping it all in sorting boxes), so only took 5min to fix.

Also cleaned up the handbrake cable of old grease and dirt, now slides a lot better.

 

 

Thanks all of you for helping ;)

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