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Iffy brakes

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Rybes View Drop Down
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    Posted: 18 May 2016 at 11:23
How do I tell if a master cylinder is dead? When I got me missus new bike the front brake was non existent. No probs I thought, ride it home bleed the brakes job done. Nope, if you pump it up you can get a squishy lever if you bleed it ya get a slightly less squishy lever. I've bled it pumped it a few times and tied it back overnight still no real improvement. I've bled it at the bleed nipples and mc banjo and there's no air comin from anywhere. So I'm starting to think it's the mc. It's a standard Gsxr cylinder mounted on flat bars not clip ons and has tockico 6pots with a pipe going to one caliper and a link pipe joining the 2. I can't reverse or pressure bleed it as I don't have the equipment and it's a week wait if I order any as the missus wants to ride it I need it sorted quicker than that. Cheers for any ideas and help
ive just got my first vtwin and i think i got the right one
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Spoonz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spoonz Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 12:08
Originally posted by Rybes Rybes wrote:

How do I tell if a master cylinder is dead? When I got me missus new bike the front brake was non existent. No probs I thought, ride it home bleed the brakes job done. Nope, if you pump it up you can get a squishy lever if you bleed it ya get a slightly less squishy lever. I've bled it pumped it a few times and tied it back overnight still no real improvement. I've bled it at the bleed nipples and mc banjo and there's no air comin from anywhere. So I'm starting to think it's the mc. It's a standard Gsxr cylinder mounted on flat bars not clip ons and has tockico 6pots with a pipe going to one caliper and a link pipe joining the 2. I can't reverse or pressure bleed it as I don't have the equipment and it's a week wait if I order any as the missus wants to ride it I need it sorted quicker than that. Cheers for any ideas and help
 
I helped a mate fit venhill braided hoses to a GSXR600 and the brakes were an absolute pic to bleed. It didn't help that it was in Dundee in winter and a cold garage which made the fluid a bit sluggish. There was no easy answer, we tried reverse bleeding rotating calipers etc etc and after about 200 attempts we got a decent brake. 

Only tips I can give is to unbolt the calipers so you can rotate them and make sure the pistons are right back in the calipers with something wedged to stop them coming out as you bleed.
 
If it's running the oem lines you will have a softish lever whatever as the hose expands somewhat as you compress the brake but it shouldn't pump up.
 
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Rybes View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rybes Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 12:40
I've just been hunting and found a long enough pipe to take a pipe down from the mc to each caliper so gunna try that and ditch the short link pipe I'll do what ya said to spoonz see how it goes
ive just got my first vtwin and i think i got the right one
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Prsv View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Prsv Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 13:13
Seem to remember a recall on Gsxr master cylinders failing.
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Mr Miller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mr Miller Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 13:17
I put a GSXR front end with 6 pots on my RF 900 and had nothing put trouble with them
pig to bleed and bad for fading need serviced every two minutes (feels like) so I stuck
them in for 4 pots and never regretted it, now have sharp brake and no fading..
http://www.powerhouse.uk/content/motorcycle-brakes/motorcycle-brake-caliper-exchange-service.php
Dealt with these guys and my experience was all good Thumbs Up
If you find us in a hedge check the bike first please .. I`m free on the NHS...
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Prsv View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Prsv Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 13:28
searched it return spring rusts with old fluid so doesn't return past inlet port properly.
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Rybes View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rybes Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 13:40
Cheers for that. I might look for some new master cylinders with remote reservoirs at the moment the resoivoir sits at such an angle I have to take it off the bike to bleed em. New mcs would solve that problem. What year Gsxr prsv ? This ones a 94
ive just got my first vtwin and i think i got the right one
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426hemi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 426hemi Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 14:28
The gsxr mc was recalled from k5 onwards.
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Rybes View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rybes Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2016 at 15:49
Ah so it's not mine then. Changed it over for 2 lines instead of one but still hot a sponge lever so got it tied back now n I'll leave it for a bit see what happens
ive just got my first vtwin and i think i got the right one
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