harrier
Posts: 55
Joined: Tue Oct 05, 2010 9:32 pm

Brake bleeder nipple thread size

Mon Nov 02, 2015 10:24 am

Anyone know offhand what the thread is on the brake bleeder nipples? I have to bleed the brakes, and I would love to put speed bleeders in to make it a one-man job.

Also, I have a Motiv power bleeder for my BMW, but I see no real way to connect it to the Nissan master cylinder. Anyone know if there is an adapter?

Thanks

harrier
Posts: 55
Joined: Tue Oct 05, 2010 9:32 pm

Re: Brake bleeder nipple thread size

Sat Nov 14, 2015 3:49 am

Nissan Leaf bleeder nipple is m7x1.0

Installed Speedbleeders to make it easier to flush the brakes. Makes it dead simple to do.

Bleeders:
http://www.amazon.com/gp/product/B000CP ... ge_o02_s00

Clear plastic line:
http://www.amazon.com/gp/product/B000HE ... ge_o03_s00

Use plastic drink bottle for receptacle.

I suspect there are not a lot of folks on this forum doing DIY, but it took a while for me to figure this out, and I want there to be something that will show up on google when the next guy like me searches!

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Nubo
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Re: Brake bleeder nipple thread size

Mon Jun 10, 2019 10:34 pm

harrier wrote:Nissan Leaf bleeder nipple is m7x1.0

Installed Speedbleeders to make it easier to flush the brakes. Makes it dead simple to do.

Bleeders:
http://www.amazon.com/gp/product/B000CP ... ge_o02_s00

Clear plastic line:
http://www.amazon.com/gp/product/B000HE ... ge_o03_s00

Use plastic drink bottle for receptacle.

I suspect there are not a lot of folks on this forum doing DIY, but it took a while for me to figure this out, and I want there to be something that will show up on google when the next guy like me searches!


I'm assuming this means that all 4 calipers use this size bleeder?

Thanks for blazing the trail. The manufacturer doesn't seem to have bothered with their application chart for over a decade. :roll:
I noticed you're still working with polymers.

powersurge
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Location: Long Island, NY

Re: Brake bleeder nipple thread size

Tue Jun 11, 2019 6:55 am

2 things....

1) I have changed my brake fluid.. The stock nipples work fine with one turn to open... What you do need is a vacuum pump to make it a one man job. No pumping the brakes... You really do not need fancy nipples (which look like they will cost $45 for a set of 4??)

2) If you REALLY want to replace the brake valves, then take one out and take it with you to the auto parts store to find out the thread gauge...

Careful..... The front and back may be different.....

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Nubo
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Re: Brake bleeder nipple thread size

Tue Jun 11, 2019 11:23 am

powersurge wrote:2 things....

1) I have changed my brake fluid.. The stock nipples work fine with one turn to open...

I'm sure they do. I've done brake work on various cars. But I'd prefer to do this solo. I've done the "submerge the hose" trick, but I find bleeding is more effective when some pressure is built and relieved.
What you do need is a vacuum pump to make it a one man job. No pumping the brakes... You really do not need fancy nipples (which look like they will cost $45 for a set of 4??)
The vacuum methods can be problematic. I was hoping to use a pressure system but we seem to have an oddball reservoir and I didn't want to muck about trying to get some "universal adapter" to adapt :) EDIT: oh, and the price is for a set of 2, so not too bad...
2) If you REALLY want to replace the brake valves, then take one out and take it with you to the auto parts store to find out the thread gauge...

Careful..... The front and back may be different.....

Yeah but I'd rather avoid that if possible. A bit of cross-checking for alternative replacements suggests the 4 are identical. We'll see.
I noticed you're still working with polymers.

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Nubo
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Re: Brake bleeder nipple thread size

Thu Jun 13, 2019 8:09 pm

So an update for flushing my 2015 SV -- the bleeder screws are definitely different between front and rear. Could have told if I had just bothered to look :oops: ;)
Front are larger than 7mm. Since the bleeding sequence starts with the front wheels*, I didn't bother with any of the speed bleeders and just relied on the "submerged hose" method. I should have gotten a screw gauge so I could update the thread with the size of the front screws; sorry about that.

* -- so this is something to note; sequence is different depending on model year. Between 2014 and 2015 the bleeding sequence changed to Right Front, Left Front, Right Rear, Left Rear. In 2014 it was RR,LF,LR,RF Goes against traditional advice, but engineers must have had a reason for all this so I went with it.

Also, the service manual doesn't explicitly give a "flush" procedure. There's a "drain", a "refill" and a "bleed" procedure.

"Drain" doesn't specify a wheel sequence. It also starts with disconnect of the ABS, or IBU or 12V battery. Distinctly different from the specified "bleed" procedure, which says start the car in accessory mode (presumably with everything else connected). I didn't really want to go over the car twice, so I followed the "drain" procedure moving from wheel to wheel in the bleed sequence, and since it allowed me to develop pressure with the pedal I let it serve as the bleeding step. Had I ended with a soft pedal I would have gone through the bespoke bleed procedure using the time-tested "helper" method.

More specifically - drain procedure states close all doors and hatch; make sure "room lamp" is off, wait at least 3 minutes and then disconnect either the ABS actuator harness, the IBU, or the 12V battery. I went with the 12V battery. I assume this somehow allows proper fluid flush of the ABS, but the manual doesn't give up its reasons so easily.

I used this bleeder bottle, which is convenient. You could of course make your own with tubing and a gatorade bottle https://www.amazon.com/gp/product/B000W7F2GI/. I hung the bottle so that the tubing rose away from the bleeder screw before descending into the bottle. This gets any bubbles away from the screw opening so they're not pulled back into the caliper.

After slowly pumping each wheel enough times to get clean fluid out of the calipers, I turned the bleeder screws so that fluid could barely flow, and then did a few more pumps with the increased pressure to force out any remaining air. The brake boost was of course off with the car asleep, so you need some leg strength for this.

The fluid was about 2 1/2 years old. The difference in appearance was enough to know when the line was fully flushed. The old fluid looked like iced tea; the new fluid looks more like pale apple juice.

After a test drive the brakes felt fine; took the car to a road where I could do a number of high-performance stops and also exorcise the ABS. :mrgreen: :lol:

Ended up using just over a quart of fluid for the complete flush. There was plenty left if I had needed to re-bleed. FWIW, here's the fluid I chose https://www.amazon.com/gp/product/B07338GQM8/ Of course you can just go to the parts store and get the big bottle of Prestone DOT3 for cheap and still be fine.
I noticed you're still working with polymers.

powersurge
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Re: Brake bleeder nipple thread size

Fri Jun 14, 2019 7:00 am

I have been using this for years with good results.. on any car.

https://www.amazon.com/d/Brake-System-B ... B000FUMWTM


Brake Bleeding procedure order is the following:

(for all cars) drain the furthest from the master cylinder first, and then down from there.... SO:

First you suck out all the old fluid from the master cylinder with tubing or a turkey baster.

Then -

Drain -
1) Rear Right
2) Rear Left
3) Front Right
4) Front Left....

Remember to keep the master cylinder full with fluid as you do each wheel, or you will get air bubbles and need to start again!

good luck

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Nubo
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Re: Brake bleeder nipple thread size

Fri Jun 14, 2019 4:30 pm

FWIW...

Image

Image
I noticed you're still working with polymers.

RustyShackleford
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Re: Brake bleeder nipple thread size

Thu Jun 27, 2019 12:14 pm

Nubo wrote:So an update for flushing my 2015 SV -- the bleeder screws are definitely different between front and rear. Could have told if I had just bothered to look :oops: ;)

Any guesses as to the 2018 ? Look where, at the actual car, assuming wrench sizes are different if and only if thread size is different ?

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Nubo
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Re: Brake bleeder nipple thread size

Thu Jun 27, 2019 1:17 pm

RustyShackleford wrote:
Nubo wrote:So an update for flushing my 2015 SV -- the bleeder screws are definitely different between front and rear. Could have told if I had just bothered to look :oops: ;)


Any guesses as to the 2018 ? Look where, at the actual car, assuming wrench sizes are different if and only if thread size is different ?


The nipples should be somewhere on the brake caliper; pretty easy to spot. May or may not have rubber caps on them. It was immediately apparent that the size of the bore it screws into was different from front to back. The wrenching nuts were also different size but I wouldn't take same size nuts as a guarantee that threads are the same.

powersurge's advice to remove and check the thread is sound if you really want to make sure before ordering replacements. I just didn't want to have to bleed the brakes as a prerequisite to getting a device to help me bleed the brakes (again) :lol:
I noticed you're still working with polymers.

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