Date: 07-11-25  Time: 21:12 pm
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Author Topic: Rear brake bleed  (Read 2029 times)

humbucker88

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Rear brake bleed
« on: 27 August 2013, 07:23:08 pm »
Replaced my rear brake line, attached the caliper, bled the MC, bled one side of the caliper, went to bleed the other side/nipple but not getting any pressure? Does this mean the caliper piston seals are busted?
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lds1973

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Re: Rear brake bleed
« Reply #1 on: 27 August 2013, 08:01:33 pm »
Just keep trying it will come through in the end.
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humbucker88

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Re: Rear brake bleed
« Reply #2 on: 27 August 2013, 08:23:34 pm »
Brake fluid is coming through... but I've got a problem with almost no pressure on one side of the caliper...
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Dead Eye

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Re: Rear brake bleed
« Reply #3 on: 27 August 2013, 10:29:14 pm »
How exactly do you know there is no pressure on only one side? How have you tested this?

If fluid is coming through then it will eventually pressurise unless their is a leak. If the piston isn't moving then it could be seized in which case it probably needs a clean and new seals wouldn't hurt.
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humbucker88

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Re: Rear brake bleed
« Reply #4 on: 28 August 2013, 04:23:35 pm »
After a little investigating I believe the o-ring between the 2 halves of the caliper has failed after a recent overhaul of the caliper. Anyone know where I can get a suitable replacement? I believe yamaha doesn't do one but there must be something similar out there?
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kebab19

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Re: Rear brake bleed
« Reply #5 on: 28 August 2013, 04:33:30 pm »
I believe Delboy from Delboy's garage (Youtube) surrounded the o-ring area with a tiny amount of silicon sealant, which formed a tight seal when the two halves were tightened

Delboy's Garage, Suzuki Bandit Brake Caliper (Full Rebuild).


Obviously for a Suzi Bandit but same principle - forward to 19 mins 30 secs or thereabouts
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humbucker88

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Re: Rear brake bleed
« Reply #6 on: 29 August 2013, 05:18:12 pm »
Cheers, doesn't seem like a bad idea actually, I think it would be a last resort. Luckily it seems you can buy anything online nowdays: http://www.ebay.co.uk/itm/150695106030
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garyb

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Re: Rear brake bleed
« Reply #7 on: 31 August 2013, 09:58:27 am »
With regard to bleeding, I overhauled my rear caliper recently and when reassembled, had great difficulty getting any firm pressure on the brake pedal, even though there was plenty of fluid coming out each time I bled it. Tried this for ages and in the end I unbolted the caliper with the brake hose still connected, turned it around slightly, and bled it again whilst holding upwards in hand.

Several bubbles of trapped air came out and the pressure at the pedal was fine.

Just mentioning as may be useful to someone if they are having the same issue.
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