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Thread: Bleeding master cylinder? Any tips / best practices?

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Posts: 11-15 of 15
2011-08-06 23:56:31
#11
maybe you can use this information, you can bleeth by yourself

http://www.sr20-forum.com/suspension/21278-ad22vf-rebuild-kit.html
2011-08-07 16:22:04
#12
Well we kinda went with a bench bleeding method in the end and the pedal now feels great. My buddy opened the lines at the MC until we got all air out of the MC and then did the normal bleeding method a few times each time getting some air out. Now the pedal feels like a champ. There was a ton of air in the system.
2011-11-29 17:37:19
#13
Originally Posted by wes
This thread is about bleeding the MASTER CYLINDER, not the brakes....

I personally bench bleed them before installation. They sell kits that are plastic fittings with plastic tubes that you run off the brake line fittings and into the MC itself. Fill it with fluid and pump away. This is THE BEST way to do it on or off the car. If you buy a new MC they typically give you the kit....


Quote below is from the OG forum.

Originally Posted by wes
I just did this last weekend. The best method is to follow the FSM. It states to have the brake lines disconnected from the MC. Top it off with fluid, place your fingers over all 4 ports and have someone pump the brakes until no more air comes out of the MC (it will bubble up in the fluid in the MC). It worked perfect!

I spent the hour before that trying to use fittings in the MC and fluid to try and bleed it on the bench, I did nothing but make a mess and burn through a bottle of fluid......


^What about this method? Work just as well?

P.S. Is this with the lid on or off?

Bleeding the Brake Master Cylinder - HOW?? - SR20 Forum

^Source link post #5

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OFF TOPIC (but still related)

Originally Posted by eric96ser

If you don't bleed the system in the correct order, the pedal will be soft. Going from the furthest to the closest, is good for changing the fluid, but not for bleeding. For the B13, the order is LR, RF, RR, LF. Try bleeding in that order, and not pushing the pedal all the way to the floor, and not too quick. I use clear hose, so you can see the air in the lines. My wife helps me bleed them, and all the cars we have done, have been perfect. I have her pump the brakes a few times, and hold it. With the clear hose attached, I open the bleed screw. With it still open, I have her pump the brakes. You will see the fluid come out, and any air bubbles. Once the fluid is clean, I have her hold the brakes while I close the bleed screw.

The fluid in the hose keeps air from entering the system with the bleed screw open. Make sure the MC doesn't empty and you will be good.


Originally Posted by eric96ser
I've bled my brakes using the furthest to closest, and they felt soft. After using the correct order, they were rock solid.


^Can someone explain the parts in red?

brakes bleed but stull mushy. - SR20 Forum

^Source link post #15 and #20.
Last edited by MR-4Door-SR20DET on 2011-11-30 at 21-23-46.
2011-11-30 22:56:48
#14
The easier way is bench bleeding by locking the master in a vice then atatching the caps that come with the master cyl (in most cases ) and pushing the piston in and opening the fitting like a nornal bleed proccess . Never pump the master when bleeding and empty system or master . Only push down 1 time and hold it releasing the bleeder or cracking the line loose then repeat untill fluid comes out . As pumping will cause the brake fluid to foam and fill with air bubbles . Also do the same when replacing main lines or rubber lines . But if doing a regular brake flush on a full system then pumping 3-5 times is ok . This ofcourse is allways easier with bleeder tool the atatches to the top of the resivoir . The gravity bleeding does not get it completly air free but it does help move fluid along threw empty lines . Abs cars are more difiicult to bleed and some times may require the car to be running like some GM models to open the valves in the pump unit .
Last edited by tsuruser on 2011-11-30 at 23-08-38.
2012-03-11 01:04:39
#15
thread bump..
what size are the 4 fittings on our master cylinder? specifically the NX master cylinder if it makes a difference. I was going to order 2 of those kits from rockauto to bench bleed it before I put it on. None of the local autoparts stores have bench bleeder kits & they all look at me like I have a hole in my head when I ask about ordering one lol
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