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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 12:07 #869251

  • woodman
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Looking for advice on reasonably priced pressure bleeder for rear brakes on 82 GPZ750R. Rebuilt the rear master cyl and getting any pressure to bleed them is kicking my butt. Im going to try reverse filling the lines with brake fluid using an old pump oil can I cleaned out with alcohol. Good idea or not ? Thanks for the help

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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 12:44 #869252

  • Wookie58
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You may find it easier to use a vacum bleeder and draw the fluid through the system to the bleed nipple, they are around £20 from Amazon (also less likely to make a mess of your paintwork than a pressure bleeder)
1982 KZ1000 Ltd
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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 13:44 #869255

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Could you recommend a good one?  My bike has the remote reservoir, an 82 GPZ750 and Im in Montana US

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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 14:25 #869256

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I use some wraps of PTFE Teflon tape on the bleeder threads to get an airtight sealing during the normal and vaccum bleeding process.
Otherwise air could be permanently suck in through the bleeder threads when you release the brake pedal. Ask your plumber next to you for the tape.



 
 
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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 14:47 #869259

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Could you recommend a good one?  My bike has the remote reservoir, an 82 GPZ750 and Im in Montana US

I have recently bought this one (haven't used it for bleeding yet as I bought it to test the "active" engine mounts on my car) it holds a vacum no problem with a couple of pumps. With vacum bleeding the seal is less critical as you are sucking from the nipple (so to speak) so you won't introduce air to the system REMEMBER TO CLOSE THE NIPPLE BEFORE YOU RELEASE THE VACUM

 
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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 14:50 #869260

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Mytivac makes a good one.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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Pressure Brake Bleeder on 82 GPZ750 23 Jun 2022 17:51 #869270

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I bled the brakes on my car a few weeks back and used a pressure bleeder; bought an attachment for the master cylinder, then hooked up a pressure canister to push the fluid through the system.  I've used vacuum bleeders before, but never again.  The pressure system works WAY better.  Problem, though, is rigging up a cap of some sort, so pressure can be applied.  If you have a spare cap then it would be easy by attaching a nipple of some sort, so pressure could be applied.  
Ed

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1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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Pressure Brake Bleeder on 82 GPZ750 24 Jun 2022 00:39 #869278

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I bled the brakes on my car a few weeks back and used a pressure bleeder; bought an attachment for the master cylinder, then hooked up a pressure canister to push the fluid through the system.  I've used vacuum bleeders before, but never again.  The pressure system works WAY better.  Problem, though, is rigging up a cap of some sort, so pressure can be applied.  If you have a spare cap then it would be easy by attaching a nipple of some sort, so pressure could be applied.  

I don't disagree that pressure is better for a car due to the distance between master cylinder and callipers and the added components in the system (ABS pump, reduction valves etc) the problem with using a DIY pressure bleeder set up is the risk of spraying brake fluid over painted components (it's a great paint stripper if not hosed down immediately) that is why I suggested the vacum option (IMHO)
1982 KZ1000 Ltd

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Pressure Brake Bleeder on 82 GPZ750 24 Jun 2022 06:08 #869287

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If you are having that much trouble getting the air out of the rear brakes, the problem may be elsewhere. That is, not air trapped in the system but rather air getting in from somewhere else or the MC was improperly reassembled or with incorrect parts. 
Jim
North GA
2016 Yamaha FJR1300ES
1982 GPz750 R1
1974 Kawasaki H1
1976 Kawasaki KZ400
1979 Yamaha XS650 cafe'
2001 KZ1000P
2001 Yamaha YZ426
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Pressure Brake Bleeder on 82 GPZ750 24 Jun 2022 08:59 #869291

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If you are having that much trouble getting the air out of the rear brakes, the problem may be elsewhere. That is, not air trapped in the system but rather air getting in from somewhere else or the MC was improperly reassembled or with incorrect parts. 
 

Yeah, I was going to say the same thing.  Many folks here have had issues with debris and rust clogging the very small diameter relief port.  When this happens it typically makes it very hard or impossible to bleed the system.  Here is a recent post talking about the issue.  There are many others.

kzrider.com/forum/5-chassis/409303-rear-...-off?start=36#868749
'78 Z1-R in blue , '78 Z1-R in black, '78 Z1-R in pieces
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Pressure Brake Bleeder on 82 GPZ750 24 Jun 2022 15:20 #869305

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I some times reverse fill the brake system using a 60cc syringe filled with brake fluid. Start with little or no fluid in the mc resiver and push the 60cc of fluid through the slave bleed port.
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Pressure Brake Bleeder on 82 GPZ750 24 Jun 2022 15:23 #869306

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I agree with GPzGuy and DOHC, Your masking a problem. I have rebuilt several M/C’s and all have built pressure within the first or second pump. You have a problem in the system that needs addressing. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
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