cleaning contaminated discs?

Good point.

 

excellent - ta.

I think I'm sorted now, thanks for all the help.

Exactly how many weeks/months/years does the pocket money stop for? As
"attempted murder" is meant to be sentenced as harshly as murder, I
think we are talking after the Olympics......

cheers

SS

 

Seems to a lot of words being typed about **** all.
A can of brake cleaner with have the disks and calipers clean, and a new set
of pads.

If you want to try saving the pads clean them off with petrol, put them in a
pan with some kitchen bleach and heat until bubbles start to rise. Rinse
them off in cold water. Done. BUT just ask yourself if the WD or the
bleaching might have affected the bonding between friction pad and backing
plate. Your call, I've done it often enough and survived.

 

It has a single leading shoe drum brake at each end - nothing short of
chucking an anchor off the back will slow it down

 

If I wrote a list of UKRMer most likely to impersonate Valentino Rossi then
your name wouldn't be near the top, or even on the list.

 

someone's grumpy today

 

You snipped the important first step - a good wipe with cellulose thinner.
This takes the worst off then the heat takes the rest.
NOT WRONG - It has worked just fine for me on SOBs which have been
stored with a good coat of WD40 or other oil preservatives.

 

Which is why I suggested the burn off technique. It even works with
contaminated drum brakes.

 

It's a fucking good way to warp discs, that's what it is, you thick
thick ****.

 

wessie took a blunt brush and painted...

Plus its more fun to burn the oil off by baking the discs. And free. And
involves riding fast (on a long, straight bit of road)

 

Lozzo took a blunt brush and painted...

There is no such thing as a warped brake disc. [1]

[1] Well, not on cars anyway. The "vibration" whilst braking is caused by
uneven coating of brake friction material on the disc and hard areas.

 

Is it really? Every day is a school day.

--
Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3
Tyger, Tyger Burning Bright (Remove rust to reply)
116 Giulietta 3.0l Sprint 1.7 GTV TS GT 3.2 V6
Triumph Sprint ST 1050: It's blue, see.
www.cuore-sportivo.co.uk

 

And end up with warped discs.

 

Whaaaa? I think you're talking a load of old cojones there. They def. do
'warp', you can measure the runout with a dial gauge.

 

How do you explain the run out I've seen when clocking discs prior to
skimming them true again? This is on bike discs and car discs and I've
skimmed quite a few over the years so it's not just a one off thing.

 

There is on bikes. At a guess it's because the discs are much thinner
than car ones. I've had to replace discs on a couple of bikes because
of this - last time was a TL1000 whose disc was sosmething like 0.5mm
out IIRC.

Bu I have also seen discs pitted unevenly due to corrosion (could have
been corss contamination as you say though) - only took a few days of
being left wet, too. It wouldn't wear off so I eventually resorted to
careful use of emery cloth, which worked surprisingly well.

 

So Hagon have been fleecing me for straigtening them for the past 15
years and I've been very mistaken when I've had a DTI set up to measure
how much runout they have?

Honestly Frag, I expect better trolls from you.

 

Andy Bonwick took a blunt brush and painted...

http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml

Bear in mind that makes no mention of bike discs, just car discs.

It does blow the myth of warped car discs out of the water though. Very
interesting read.

 

Lozzo took a blunt brush and painted...

Read the link I posted in my reply to AndyB.

It concerns *car* discs, but I wouldn't be suprised if *most* supposedly
warped bike discs are due to exactly the same problem.

Note that it doesn't say *all* "warped" discs are not warped, but a huge
proportion of them aren't. And due to ignorance / myth garages just change
them.

 

I remember watching the front disc on my old Z400 twin (the one sold to
Petrolcan) being skimmed, and (trust me on this), warped it certainly
was. You could see the cutting tool making contact and then not.

(Bought an NOS front disc in the end for £25 as skimming didn't fully
cure it)