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Post by widget2k4 on Apr 23, 2011 20:26:57 GMT 1
Anyone had any problems getting a back brake to work on a ypvs 31k?
I have bleeded and bleeded it,there is nothing but clean fluid coming out and no air but no matter what the brake pedal just isn't there it just goes straight down with very little resistance ?
Thanks in advance
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Post by Tone on Apr 24, 2011 7:55:28 GMT 1
I had the same problem on my 83 LC2 rear brake in that no matter how much I bled it it still felt spongy. I came across some old Yamaha service bulletins at an autojumble which had one on the LC2 ref spongy rear brake that says you get an air pocket in the rear calliper with the calliper in the normal position. So when you bleed it remove the rear calliper bolt, loosen the front one and pivot the calliper up so that the pad is still contacting the disc by approximately 30%. Tighten front bolt and bleed as normal. Replace rear bolt. Funny enough my brother had the same problem on his R1 after he put a braided hoses on the back ,fluid came out but the brake wouldn't firm up.We tried the above method and it worked. Hope this helps. Tone.
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Post by widget2k4 on Apr 24, 2011 8:39:59 GMT 1
thanks for that advice, i will look into it.
not sure where the caliper should be on a lc2 as mine is on a lc with metamex swinging arm so i presume its not in the right position.
so do you think the caliper has to be lying like flat with the bleed nipple pointing straight up ?
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Post by widget2k4 on Apr 24, 2011 16:33:42 GMT 1
Ok,tried all that,I have sucked a full bottle of the stuff through and still nothing,tried the master cylinder pipe and nothing happening apart from brake fluid going all over and ruining things  I have had the pistons out and all new seals fitted, do you think it could be the problem? |
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Post by oldelsieboy on Apr 24, 2011 17:02:42 GMT 1
Ok,tried all that,I have sucked a full bottle of the stuff through and still nothing,tried the master cylinder pipe and nothing happening apart from brake fluid going all over and ruining things I have had the pistons out and all new seals fitted, do you think it could be the problem? Had a similar problem with a set of front calipers, eventually found the master cylinder seals were knackered, fitted new problem solved. OEB |
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Post by Tone on Apr 24, 2011 17:13:43 GMT 1
Did you push the pistons in as far as they could go. if so this could be the problem.
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Post by LC'Adam on Apr 24, 2011 17:16:58 GMT 1
Yep I would go with OEB, sound like master cylinder seals  Could be a worn piston in the master. Hope you get it sorted soon mate  Adam |
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Post by widget2k4 on Apr 24, 2011 17:47:34 GMT 1
Tried 2 master cylinders on 1 with new kit fitted,I did push pistons right in,I can see the caliper moving when I am pressing the brake.
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Post by widget2k4 on Apr 24, 2011 21:41:26 GMT 1
ok will have a go at that, need to get the wheel off first though:(
cant get caliper off because of swinger in the way.
will post the results as soon as i get it done.
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Post by widget2k4 on Apr 25, 2011 21:26:51 GMT 1
woo hoo got a pedal now  pressed the pedal until pistons were nearly out then pushed them back in,put it back together and it works just need to get the damn thing to run now then it can get an mot |
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