How did this happen? Mechanical advice needed!
Discussion
Ever since having my clutch replaced, I noticed a clonking sounds over bumps. Similar to that of a worn anti-roll bar link arm.
Had it looked at by my regular indy, they put it on a ramp that shook the van to death and couldn't find an issue. (They didn't change the clutch, that was a van specialist, I use this garage for my cars.)
When changing the discs and pads yesterday I discovered that calliper mount on the O/S/F was held on by one bolt, meaning the whole assembly was pivoting around.
The last person to work on the brakes was myself, I fitted new discs and pads last June, I ordered solid discs by mistake, when the pads wore down enough the fell between the calliper and the disc, hence me replacing them with new ventilated items this time!
This bolt has definitely disappeared recently judging by the wear pattern on the old pads. The noise has gone now I've reassembled the brakes with a bolt from a scrapped van.
Would the brakes need disassembling to change a clutch? Obviously I can't remember every detail from when I changed the brakes last year, but the bolts are difficult to wind up finger tight, so they would have been wound on about halfway then ratcheted on the rest, I can't imagine I'd have left them loose. Also seems a bit funny the noise appeared instantly after picking it up from the clutch change.
Any ideas/thoughts?
Had it looked at by my regular indy, they put it on a ramp that shook the van to death and couldn't find an issue. (They didn't change the clutch, that was a van specialist, I use this garage for my cars.)
When changing the discs and pads yesterday I discovered that calliper mount on the O/S/F was held on by one bolt, meaning the whole assembly was pivoting around.
The last person to work on the brakes was myself, I fitted new discs and pads last June, I ordered solid discs by mistake, when the pads wore down enough the fell between the calliper and the disc, hence me replacing them with new ventilated items this time!
This bolt has definitely disappeared recently judging by the wear pattern on the old pads. The noise has gone now I've reassembled the brakes with a bolt from a scrapped van.
Would the brakes need disassembling to change a clutch? Obviously I can't remember every detail from when I changed the brakes last year, but the bolts are difficult to wind up finger tight, so they would have been wound on about halfway then ratcheted on the rest, I can't imagine I'd have left them loose. Also seems a bit funny the noise appeared instantly after picking it up from the clutch change.
Any ideas/thoughts?
Caliper carrier bolts are usually torque to yield, so you should replace them with new when they're undone.
9 times out of 10 you'll get away with not doing so.
They're usually quite high torque too, 150 Nm plus a bit.
Not too surprising for them to relax if not replaced and not torqued correctly.
9 times out of 10 you'll get away with not doing so.
They're usually quite high torque too, 150 Nm plus a bit.
Not too surprising for them to relax if not replaced and not torqued correctly.
I had the exact same thing happen, I had even used a torque wrench so couldn't understand it. Only when I took off the calliper and cleaned it up that I noticed a crack in one of the carrier mounting holes on the calliper. I think that it was just enough to allow the vibration to undo the bolt over time.
I replaced the calliper and it never happened again.
I replaced the calliper and it never happened again.
blank said:
Caliper carrier bolts are usually torque to yield, so you should replace them with new when they're undone.
9 times out of 10 you'll get away with not doing so.
They're usually quite high torque too, 150 Nm plus a bit.
Not too surprising for them to relax if not replaced and not torqued correctly.
Did not know this, the van has done 150k, so I'd imagine they've been removed a few times in it's life.9 times out of 10 you'll get away with not doing so.
They're usually quite high torque too, 150 Nm plus a bit.
Not too surprising for them to relax if not replaced and not torqued correctly.
Vajazzle said:
I've never used thread lock and haven't had a bolt come loose yet. Chalk it down to experience but a call to the garage to ask them if they removed the caliper wouldn't go amiss.
Same here, I've replaced brakes on nearly all my cars and have never had it happen. I actually went there to get a bolt from one of their scrapped vans, I didn't think about the clutch at the time. So questioning it now would be pointless!The Vambo said:
I had the exact same thing happen, I had even used a torque wrench so couldn't understand it. Only when I took off the calliper and cleaned it up that I noticed a crack in one of the carrier mounting holes on the calliper. I think that it was just enough to allow the vibration to undo the bolt over time.
I replaced the calliper and it never happened again.
Interesting, I shall take it apart again and investigate! I replaced the calliper and it never happened again.
Thanks all.
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