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rear brake pads destroyed !!! |
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budd
Moto GP Alien Joined: 07 Oct 2014 Location: Weast Yorks Status: Offline Points: 720 |
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Posted: 06 Jul 2018 at 18:30 |
After my
incident running into the Gixer 1000 I noticed my rear brake wasn’t working,
now the RSV rear brake isn’t the greatest to start with but would at least hold
in on an incline, but not anymore it was totally u/s, a quick visual inspection revealed
the braided hose had parted company from the union at the caliper end so a new
hose was duly ordered. While I was waiting for the hose to turn up I thought I’d
use the down time to strip and rebuild the caliper and it’s just as well I
did, I’ve never seen pads in this condition… [url=https://flic.kr/p/27v5bC4] [url=https://flic.kr/p/28SYQRM] [url=https://flic.kr/p/28SYRZZ] [url=https://flic.kr/p/27v5aGM] The pads they are just destroyed,the backing plate has been bent out of shape by the piston they and are supposed to be flat not concave!! and the seals have MELTED!! the
first pic below shows one side of the caliper which is Ok the second shows the otherside where you can see
where the rubber seal is melted.. [url=https://flic.kr/p/2684kZ7] [url=https://flic.kr/p/28SYTDR] Quite how
hot it must have got I don’t know but it must have been f***ing hot to soften
the pad backing plates enough for the pistons to bend them, as to the cause I
really don’t know it’s obviously stuck on but why? The caliper seems in good
condition and the pads had plenty of meat on them so it’s a bit of a mystery,
new pads / seals / pistons are now ordered along with the hose so all I can do
is put it back together and go from there, I’ll wait and see if it’s warped the
disc is warped and may end up replacing that too. |
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Spoonz
Admins Group Joined: 11 Feb 2008 Location: North Devon Status: Offline Points: 10726 |
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incorrect push rod free play or no air gap in the fluid res
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budd
Moto GP Alien Joined: 07 Oct 2014 Location: Weast Yorks Status: Offline Points: 720 |
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good call, I'll double check it all when it's rebuilt and bled up.
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IanG
Premium Member Joined: 04 Oct 2010 Location: N Wales Status: Offline Points: 10725 |
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Throw that caliper,it's scrap Look at the lower pic,the pad has dug a channel in the locating shoulder,new pads will always index into that now and never float freely. Common fault,these Brembo rear calipers are the worst sh*te I've ever had on a bike,every one I've taken apart has the same problem,also the pin is usually bored/located out of line as well.
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www.apworkshops.co.uk
www.apriliaforum.co.uk www.apriliaownersclub.co.uk Looking forward to the next track day |
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wigginsjp
Premium Member Joined: 11 Feb 2008 Location: calne Status: Offline Points: 3460 |
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I've got a couple of decent rear calipers if you are after one
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Aprilia RSVR Factory 2007 V2 1060cc Big Bore
Aprilia RSVR Factory 2004 Race Bike Kawasaki ZX10R 2007 Race Bike Aprilia Tuono V4 1100 Factory 2020 www.apriliaperformance.co.uk www.apworkshops.co.uk |
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Crouchie
Moto3 racer Joined: 10 Jan 2010 Location: Hertfordshire Status: Offline Points: 16 |
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Sorry to crash this thread.
But could I have second dibs on one of these calipers after Budd. The shoulders of my existing caliper are worn quite badly. Cheers Phil
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Crouchie
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wigginsjp
Premium Member Joined: 11 Feb 2008 Location: calne Status: Offline Points: 3460 |
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Aprilia RSVR Factory 2007 V2 1060cc Big Bore
Aprilia RSVR Factory 2004 Race Bike Kawasaki ZX10R 2007 Race Bike Aprilia Tuono V4 1100 Factory 2020 www.apriliaperformance.co.uk www.apworkshops.co.uk |
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wigginsjp
Premium Member Joined: 11 Feb 2008 Location: calne Status: Offline Points: 3460 |
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Aprilia RSVR Factory 2007 V2 1060cc Big Bore
Aprilia RSVR Factory 2004 Race Bike Kawasaki ZX10R 2007 Race Bike Aprilia Tuono V4 1100 Factory 2020 www.apriliaperformance.co.uk www.apworkshops.co.uk |
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wigginsjp
Premium Member Joined: 11 Feb 2008 Location: calne Status: Offline Points: 3460 |
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best pics I can do
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Aprilia RSVR Factory 2007 V2 1060cc Big Bore
Aprilia RSVR Factory 2004 Race Bike Kawasaki ZX10R 2007 Race Bike Aprilia Tuono V4 1100 Factory 2020 www.apriliaperformance.co.uk www.apworkshops.co.uk |
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budd
Moto GP Alien Joined: 07 Oct 2014 Location: Weast Yorks Status: Offline Points: 720 |
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mine is all sorted now, rebuilt,bled so up and running again,
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wigginsjp
Premium Member Joined: 11 Feb 2008 Location: calne Status: Offline Points: 3460 |
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no problem. Crouchie you have PM 👍🏻
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Aprilia RSVR Factory 2007 V2 1060cc Big Bore
Aprilia RSVR Factory 2004 Race Bike Kawasaki ZX10R 2007 Race Bike Aprilia Tuono V4 1100 Factory 2020 www.apriliaperformance.co.uk www.apworkshops.co.uk |
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Rybes
Premium Member Joined: 07 May 2015 Location: Denmark Status: Offline Points: 1958 |
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I had a bike that used to do that destroyed pads in days and could never work out why. Turned out although my foot was or as I thought of the lever, it wasn't. Was just a tiny bit of my boot holding the lever down. Not enough to engage the brake but enough to get the pads to touch the disc.
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ive just got my first vtwin and i think i got the right one
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budd
Moto GP Alien Joined: 07 Oct 2014 Location: Weast Yorks Status: Offline Points: 720 |
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I think the problem may be caused by incorrect alignment of the 2 caliper halfs, when reassembling the halfs are sealed with O rings and held together with 8mm bolts, but there are no locating pins or similar to ensure the 2 sides are lined up properly and the free play around the retaining bolts will allow movement so the 2 sides can end up slight askew, this means the pad retaining pin doesn't go through square and causes the pad to bind and ultimately notches the caliper casting. So on reassembly it would make sense to completely assemble the caliper, with the pads, pad retaining pin, spring everything and then loosen the main caliper bolts the 2 halfs should then align themselves, and once everything is inline pads moving freely with no binding they can be nipped up to the correct torque. As it was me who rebuilt them in the first place ultimately it's my fault, but it's a lesson learnt.
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