Master Cylinder brake issues - Page 2 - ZX6R Forum
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post #16 of 28 Old 04-12-2017, 04:04 AM
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The copper or aluminum washers are a use once item.
Took mine to the local O'Reileys auto parts and they gave me the handful I needed after swapping hoses.

If you don't have a vacuum pump, not having luck the standard way. Reverse bleed them.
Just make sure you don't overfill the master reservoir.
The biggest horse syringe you can find works good.


Edit.. side note,, not saying this you did this.
I once had an issue bleeding the calipers. After a long day and a little drinking. My friend just put the bike back together.
After 10 minutes, a new long record of not being done. Had another drink and then asked. WHY are your bleeders on the bottom of the calipers.
I never even considered it odd, until the second look.
(He installed them on the wrong sides)

Last edited by Indy; 04-12-2017 at 04:09 AM.
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post #17 of 28 Old 04-13-2017, 05:07 AM Thread Starter
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I changed all the crush washer last night and still not able to bleed it up.

Both the bleeder screws are on the top aswell. I also tried rotating the master cylinder upwards to get possible air bubbles out of it.
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post #18 of 28 Old 04-13-2017, 05:52 AM
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OP,

It's either a problem at the calipers, with the lines, or with the MC. From what you have said, it doesn't seem very likely the problem is at the caliper end, but it's fairly simple to swap in ANY other MC, and check the lines and calipers. If they stay firm, you know the issue is for sure with the MC.

If they still lose pressure.... the problem is isolated to the lines and calipers.

If all of your problems started after the MC had an impact with the ground.... I'd try another MC for the sanity check. Hydraulic brakes are not very complicated. Isolate the issue, and go from there.

Here's an '09 radial MC for sale, cheap
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Last edited by RJ2112; 04-13-2017 at 06:26 AM.
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post #19 of 28 Old 04-13-2017, 09:40 AM
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Can you describe the issue again? You said you're able to get firm feel in the lever, but it goes away? How long does it take? Does the feel fade in minutes or in hours?

Or are you never getting pressure at the lever?

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post #20 of 28 Old 04-13-2017, 10:47 AM
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If you disconnect the lines and put a standard bolt into the outlet instead of a banjo bolt, are you able to bleed it (be careful) and maintain pressure in the M/C? If not, that's your point of issue.

I'd be surprised if it were an issue with the calipers or lines. If it were something like a seal, I'd expect to see fluid pissing out of somewhere.

If you're interested in a '99 model M/C (fully functional and a new service kit installed), it's yours for £20 plus postage.
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Last edited by Twistee; 04-13-2017 at 10:51 AM.
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post #21 of 28 Old 04-13-2017, 01:03 PM Thread Starter
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Does anyone know the right size crush washers? Also Twistee that sounds like a good deal to me... If you're still near cambridge that isn't much of a distance!
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post #22 of 28 Old 04-21-2017, 09:50 AM Thread Starter
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Still just chucking away at bleeding my front brakes with no luck...oh and my caliper broke off where the nipple is so joy there!
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post #23 of 28 Old 04-21-2017, 10:19 AM
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Take a washer off and go down to the store and buy 8 of them. This is bizarre. I can't believe that this is as much of a problem as it has turned into. I agree the problem is most likely at the MC. Sounds like it is not building pressure.
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post #24 of 28 Old 04-21-2017, 12:55 PM
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Quote:
Originally Posted by rageyoudown View Post
Still just chucking away at bleeding my front brakes with no luck...oh and my caliper broke off where the nipple is so joy there!
This is truly bizarre.

Did you try putting a standard, non-banjo-type bolt into the exit for the master cylinder (I think Brembo uses an M10 x 1)? If you can't keep pressure, with a standard bolt, there's definitely something in the M/C.

How has one of your calipers broken off? Has the nipple broken? Has the caliper split? Is this a mounting bolt that's sheared?

-------------------------------------------------------------

The best advice I ever received was "Just look pretty and try not to break anything."

1999 ZX6R (G2) - Pipewerx exhaust (dB killer removed) | Dynojet Stage 1 | K&N air filter | flushmount front LED indicators | Clear LED tail light with integrated indicators | Scottoiler eSystem | Pyramid Plastics hugger | HID headlight | Stubby levers | HEL braided steel lines | 07 ZX6R radial master cylinder | Bar-end mirrors | Double-bubble screen | Crash bobbins | one hell of an anal-retentive owner.
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post #25 of 28 Old 04-21-2017, 01:16 PM
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In fact, if the other master cylinder isn't maintaining pressure either, I'm gonna call the calipers at fault.

I'm not a gambling man, but if I were, I'd place money on one or both of the mid caliper seals as the fault. It would be enough to make the system fail to keep pressure, but wouldn't expel a lot of fluid in the process.

-------------------------------------------------------------

The best advice I ever received was "Just look pretty and try not to break anything."

1999 ZX6R (G2) - Pipewerx exhaust (dB killer removed) | Dynojet Stage 1 | K&N air filter | flushmount front LED indicators | Clear LED tail light with integrated indicators | Scottoiler eSystem | Pyramid Plastics hugger | HID headlight | Stubby levers | HEL braided steel lines | 07 ZX6R radial master cylinder | Bar-end mirrors | Double-bubble screen | Crash bobbins | one hell of an anal-retentive owner.
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post #26 of 28 Old 04-21-2017, 02:28 PM
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I think we have an operator problem.
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post #27 of 28 Old 04-23-2017, 03:52 AM Thread Starter
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Operator operator
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post #28 of 28 Old 04-23-2017, 04:24 AM
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Quote:
Originally Posted by rageyoudown View Post
Operator operator
Well, that's a call for replacing the calipers if ever I saw one.

eBay is gonna be your best friend on this one. Nearly anything with a 90mm spacing will fit. If your pads are still fairly new, a pair of Tokico 6-pots will be easy to find. Otherwise, I'd recommend a pair of Nissin 4-pots from a Bandit or Triumph.

-------------------------------------------------------------

The best advice I ever received was "Just look pretty and try not to break anything."

1999 ZX6R (G2) - Pipewerx exhaust (dB killer removed) | Dynojet Stage 1 | K&N air filter | flushmount front LED indicators | Clear LED tail light with integrated indicators | Scottoiler eSystem | Pyramid Plastics hugger | HID headlight | Stubby levers | HEL braided steel lines | 07 ZX6R radial master cylinder | Bar-end mirrors | Double-bubble screen | Crash bobbins | one hell of an anal-retentive owner.
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