dhutch
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| posted on 18/12/12 at 01:28 PM |
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When to replace Drums? - Handbrake
Just done the shoes and hbrake cable in the E36 to try and get some more bite (MOT and also if im Autotesting in it from time to time) and measured
the drums for wear while I was at it, they are currently around .5mm from the 'max wear' diameter cast into them. Cars done 150k and I
assume there origanal.
Question is, is it going to effect performace and cause the shoes not to bed into the large diameter properly, or is it going to be a non-issue?
There only £22 each, but equally they are pretty evenly worn and £44 is forty four quid.
Daniel
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coyoteboy
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| posted on 18/12/12 at 02:10 PM |
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The shoes don't bend to match the drum, they wear to match it, the old ones will be worn to match it, the new ones won't for a while, so
expect poor performance for now.
Never replaced a drum until it went to it's limit, never had a problem with drum brakes performance for handbrake use either though.
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Mr Whippy
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| posted on 18/12/12 at 03:13 PM |
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did mind a guy at work (built rally cars too) who was too lazy to change the worn drums on his peugeot 309 till the slave cylinder pistons actually
popped out, lost his brakes and rear ended someone
he did get a right slagging at work though 
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StrikerChris
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| posted on 18/12/12 at 06:17 PM |
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I've never changed the drums on any car I've had, and my old faithful astra had done many more miles than yours bm before it expired, and
never had a problem getting a decent handbrake on drums, had more nightmares with discs. One of my imps had drums so oval you could feel the pedal
going up and down coming to a rest, skimmed them true and was fine once bedded in.glazed shoes/polished drums from binding, or wifey driving with it
on, or greasy paws handling the parts would be my bet.get some 320grit and rough everything up, let it bed in before spending 50 quid for nothing!
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britishtrident
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| posted on 18/12/12 at 07:01 PM |
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I take your car has a handbrake drum within the disc ?
I know the later E46 has exactly the same rear brake system as the Rover 75/MG ZT and with these there is known problem with the handbrake
balance bar compensator stretching/distorting when the handbrake is pulled on too firmly resulting in the handbrake efficiency going down drain
next time it is pulled on.
On one of my own Rovers I modified my compensator linkage to a stiffer home made linkage based on a eye bolt and this has made an enormous
difference to the handbrake efficiency. So far one of the family's R75 is modified only 3 more to do....
The procedure was remove rear of centre console and fit the modified parts, leave cable tension a bit slack, remove the disk/drum clean up
drum and shoes with 80 grade production paper, run up adjuster in the drum so the shoes just skim the drum's surface and adjust the cable
tension at the handbrake lever, operate the brake a few times and check the tension is sufficient but gives enough clearance for the shoes just to
clear the drums.
[Edited on 18/12/12 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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dhutch
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| posted on 18/12/12 at 08:04 PM |
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As far a I know its a completely standard trailing/leading drum only system, very similar, if not quite the same, to what's on the ford English
axle of the kitcar.
The shoes arnt a great fit, and appear to be showing little signs of bedding in, hence the question as I too have also never replaced and drums or
infact, ever felt the need to question them until now.
Daniel
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