Stumped on a brake issue.

[tauntdevil]

Hello everyone.

I know the brake system is not rocket science but for some reason, this issue keeps bogging my mind and with everything else, just not figuring it out.

Here is what is happening.
When I first install the master, the pedal is very very hard and barely goes down. When it does, it pushes the air out of the lines but if you give it a little more pressure, a loud spring sound will occur and then the pedal goes down easily as if there is no master and the master will no longer provide any pressure.

Bench bleeding the master again after wards, the fittings are then wrong. One pushes, another barely provides pressure and the third works like a vacuum instead of providing pressure.

This has happened to one 240sx master and two 1995 300zx masters.


Setup that has changed and misc information.

All the lines other than the hard line under the car to the rear caliper tee fitting are steel braided and brand new. Before installing them, I was able to blow threw them all to make sure none of them are clogged and/or stuck. Calipers are all brand new 300zx calipers front and rear.

Now I read the posting on another website about the 300zx brake swap, etc and they recommended using an automatic 240sx booster or a 300zx booster but I don't recall it saying if you can or cannot use the stock 240sx Manual booster. That is currently what I have.
Does anyone know if this is causing the issue?

I am trying to use a 300zx brake master since that is recommended on the site for the correct proportion.

Seems like it may be the only thing that would cause the issue here.


I do bench bleed the master before installing it and I made sure again that all the lines are not clogged.

Anyone have any ideas?

Does not work when gravity bleeding even for a few hours (left it all open while I went to work and when I returned, still had nothing).


I appreciate any information in advance.

[Rayne]

Bleed the entire brake system, not just the brake master cylinder.

I have had to replace a brake master cylinder before. We bleed the entire system including the brake calipers.

[tauntdevil]

Originally Posted by Rayne

Bleed the entire brake system, not just the brake master cylinder.

I have had to replace a brake master cylinder before. We bleed the entire system including the brake calipers.

Are you talking about hooking the hoses to a water bottle and gravity bleeding them, then hooking them onto the master?

If not, how would you bleed them if fluid doesnt leave the master and has no pressure?

Also how do you do it without pressing the cylinder in so it doesnt break?

[Rayne]

See the factory service manual for brake bleeding instructions.

Go to a mechanic if you can't figure out even after reading the factory service manual.

[dongteixinqi]

you are right,Go to a mechanic if you can't figure out even after reading the factory service manual.thanks

[tauntdevil]

You guys obviously dont understand the issue and the car cant move if it doesnt have brakes... also I am a mechanic... lol

Is there no one that can answer if you can use a stock 240 manual boosted with z32 setup?

[eek]

When I installed my Z32 BMC it was on a 96 Base Manual. Never had an issue with the setup. The brake booster on the auto s14 is larger compared to the ones that came with the manual trans. If you have the brake booster from an auto it will help but it is not needed to complete the swap.

We bench bled the z32 BMC 1st then bled the entire brake system according to FSM. The Z32 BMC is not per say needed to complete the brake swap but it is HIGHLY recommended since the factory 240sx BMC is smaller and pedal feel will be very spongy. I would look at your BMC and verify its not faulty. I'm using a 16/16 Z32 BMC if your wondering.

[tauntdevil]

Originally Posted by eek

When I installed my Z32 BMC it was on a 96 Base Manual. Never had an issue with the setup. The brake booster on the auto s14 is larger compared to the ones that came with the manual trans. If you have the brake booster from an auto it will help but it is not needed to complete the swap.

We bench bled the z32 BMC 1st then bled the entire brake system according to FSM. The Z32 BMC is not per say needed to complete the brake swap but it is HIGHLY recommended since the factory 240sx BMC is smaller and pedal feel will be very spongy. I would look at your BMC and verify its not faulty. I'm using a 16/16 Z32 BMC if your wondering.

Thank you for the reply.

I will purchase another and try again to see if it will work. Thank you.

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[Rayne]

Originally Posted by tauntdevil

You guys obviously dont understand the issue and the car cant move if it doesn't have brakes... also I am a mechanic... lol

Is there no one that can answer if you can use a stock 240 manual boosted with z32 setup?

No, we understand the situation. Somehow you have forgot about the "Emergency brake." When I had to replace the master brake cylinder in one of my vehicles, I had to use the emergency brake to stop the car on my way home from work and also from my house to the airplane mechanic my family knew down the street.

You are "Mechanic". Yet you ask about how to bleed a brake system.

Hmmm any guy with a tool box can be considered as a "Mechanic."

About the brake 240sx brake booster. You have already answered that question. Reread your initial post.

[tauntdevil]

Originally Posted by Rayne

You are "Mechanic". Yet you ask about how to bleed a brake system.

Hmmm any guy with a tool box can be considered a "Mechanic."

About the brake 240sx brake booster. You have already answered that question. Reread your initial post.

Not asking how to bleed the system, asking how to resolve an issue that keeps breaking the brake masters even though its a setup that someone else uses.
A mechanic can be someone without a toolbox as well. All depends on each persons terms of who a mechanic is.

Also I am waiting for an automatic 240sx brake booster to arrive along with a new z32 brake master in hope that it resolves the issue.

The brake system isnt a difficult system hence why I stated that the issue has stumped me. If you know the answer, answer it, stating to go to a mechanic who also would have the same issue is basically the same as you saying "I Don't know".

[Rayne]

Originally Posted by tauntdevil

Not asking how to bleed the system, asking how to resolve an issue that keeps breaking the brake masters even though its a setup that someone else uses.
A mechanic can be someone without a toolbox as well. All depends on each persons terms of who a mechanic is.

Also I am waiting for an automatic 240sx brake booster to arrive along with a new z32 brake master in hope that it resolves the issue.

The brake system isnt a difficult system hence why I stated that the issue has stumped me. If you know the answer, answer it, stating to go to a mechanic who also would have the same issue is basically the same as you saying "I Don't know".

Reread the third post in this thread. Obviously you don't know, since you are asking a question.

Remember I have had to replace a brake master cylinder. My mechanic friend of mine and I bled the entire brake system after we installed a new master cylinder.