BenB
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| posted on 21/2/09 at 01:55 PM |
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Tintop brake pistons
I heard a rather nasty metal scrapping noise coming from the rear of the tintop a few days back. Whipped off the caliper to find zero material left on
the pad. Luckily the discs look alright.
but..... try as I might I couldn't get the blooming piston to retract. The Haynes book of lies says rotate clockwise so I sat there for half an
hour rotating the piston and it's staying firmly stuck in place. I finally gave up, put the old pads back and came home for a cuppa.
Anyone know why this might happen? As far as I'm aware the wind-back works on the principal of screwing the brake piston onto the handbrake
adjuster. Could it have come off the end of the adjuster after having come out so far? Any other options.
I've ordered a proper windback tool so I could hopefully put some weight behind it... Any other options??
Thanks in advance!!
Ben
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britishtrident
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| posted on 21/2/09 at 02:43 PM |
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Slacken the handbrake cable tensioner back until the cable is fully slack, clamp the flex hose and crack open the bleed nipple (not a good idea to
push fluid back to the resevoir on modern cars) -- then push and turn the piston back
Also not unknown for some piston to have left hand threads
[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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theconrodkid
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| posted on 21/2/09 at 03:07 PM |
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what sort of shed is it?most types you need to push and turn,the tool to do it isnt dear
who cares who wins
pass the pork pies
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Danozeman
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| posted on 21/2/09 at 05:21 PM |
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As trident says you need to push it back aswell.
If its jumped off the screw it will jam aswell. Which if the pads are worn right through it may well have done.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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BenB
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| posted on 21/2/09 at 05:46 PM |
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Arse. Well I've ordered the proper tool and I'll give it another go middle of next week.......
It was going round fairly easily so I reckon it's jumped off the thing... We shall see.
It's going to be one of those days where everything goes wrong.....
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mad-butcher
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| posted on 21/2/09 at 07:05 PM |
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the most common type of wind back tool is a 12" grinder nut spanner
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BenB
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| posted on 21/2/09 at 07:56 PM |
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Damn! Didn't think of that  Good idea, I knew somewhere there would be something I could use!!!
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MikeRJ
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| posted on 21/2/09 at 09:50 PM |
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A G-clamp to push it back (whilst rotating it) helps, but the proper tools makes it far easier.
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britishtrident
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| posted on 23/2/09 at 10:09 AM |
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Never use more than gentle pressure --- I have seen a pair of calipers that were knackered by a fast-fit cowboy forcing the pistons back using the
Sykes-Picavant tool --- only thing that stopped the pistons going back was the tension in the hand brake cable. Always slacken the cable
tension back before trying to turn & push the pistons back
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