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View Full Version : Holy cow, never had this before.


FROSTY
3rd August 2009, 15:57
Our latest project bike had me stumped. Brake lever diddn't move--as in siezed rock solid. Bikes been standing at least 8 years so no suprises there.Took the master off and started the degunge process. Accidently flicked the lever and HMM it moved normally. -ODD but ok then the caliper pistons must be siezed then. Off with one caliper and--er hang on clean hmp grease and hitting it with the airgun has the pistons flying in and out easilly. HU???
Ok so its gota be the joint. NOPE
Well bugger me blow through the brake lines and theyre all gunged up totally solid.--NOTHING moving inside em.
New one by me I must say.
Cajun
3rd August 2009, 15:59
time for new brake lines me thinks.
imdying
3rd August 2009, 16:05
When I get those I put 4000 psi through (air over hydraulic tester, all hoses are tested to that before they leave the hose making room) them to see if they'll clear :done:

Sometimes they won't, so I'll cut em up to see what the heck happened, sometimes they will and a bit of rooted rubber will fly across the room like a bullet :D OSH would have kittens :innocent:
FROSTY
3rd August 2009, 16:37
yea but what would make something decide to block up when it was a sealed opperating system--arggg
James Deuce
3rd August 2009, 16:39
yea but what would make something decide to block up when it was a sealed opperating system--arggg
Going from DOT 4 to DOT 5 without flushing properly will do that.
jim.cox
3rd August 2009, 16:39
yea but what would make something decide to block up when it was a sealed opperating system--arggg

I've had this on my Quad (Polaris)

Only solution was to replace all the lines

I've wondered what caused it, as the lines were ok (warrantable) on the outside
imdying
4th August 2009, 10:16
yea but what would make something decide to block up when it was a sealed opperating system--argggTypically contamination from dirt, rusting cylinder bores, or incorrect fluid.


Going from DOT 4 to DOT 5 without flushing properly will do that.Possible, but unlikely. DOT 5 is not actually easy to buy if you're not specifically looking for it. Much more likely is ATF, not unusual for some numpty to fill their brakes with that.
mouldy
7th August 2009, 13:11
yea but what would make something decide to block up when it was a sealed opperating system--arggg
Old age and moisture , same things happening to my body .
Hinny
18th September 2009, 19:37
Old age and moisture , same things happening to my body .

Old age and alcohol, same thing happening to my body.
Maybe somebody used something to liberate an 'oh' here or there to produce an alcohol from a hydrocarbon ??????????
Feck it's been a while since I knew any biochemistry.
I do know about the first part tho'!
Hinny
18th September 2009, 19:38
This Red is Sublime!