Urgent Brake problem

[yct1012]

I am driving a 2006 z4 e85 2.5si
Imagine divided the brake pedal by 10/10, 1-10 from shallow to deep
Usually the brake start working when apply 1/10 brake,
However, my car's brake start working when applying 5/10 brake, and the situation is getting worse day by day
the garage worker replace my car with a new master cylinder with the procedure of replacing brake oil
the brake is fine at the beginning, and soon getting worse as before
I check with my other friends that they also own a 2003 z4,
they have a different design of master cylinder (two more socket at the bottom), is that the possible problem?
the garage worker said the problem is from the brake pipe, is that true?

please see attachment with more details
Thank you very much

 

[Smartbear]

We can’t diagnose a brake problem without looking at the car, because it’s extremely dangerous to be gradually losing your brakes I’d leave the car at the garage to sort it out before you start posting about replacement body panels
Rob

 

[yct1012]

We can’t diagnose a brake problem without looking at the car, because it’s extremely dangerous to be gradually losing your brakes I’d leave the car at the garage to sort it out before you start posting about replacement body panels
Rob

Thank you for your reply.
The garage guy are also checking which parts is going on
I am here to look for any possible advise that help

 

[PDJ]

Who ever rounded the brake pipe nuts off on your car wants shooting

I would find someone that has the training competency and experience as well as the correct tools to work on brakes.

 

[yct1012]

may i know can i find correct brake pipes from other models car?

 

[PDJ]

One is the correct type of tool for brake pipe connector fitting the other tool is not and it looks like your man used the wrong one.

 

[yct1012]

One is the correct type of tool for brake pipe connector fitting the other tool is not and it looks like your man used the wrong one.<br style="user-select: auto;"><br style="user-select: auto;">E8FA59A2-9DED-4A96-9344-2DD361A23307.jpeg

we knew it already, and i am now looking for spare pipes
maybe i know if this pipe is compatible with other model of car so i can easily get a new one

 

[PDJ]

With the info you have posted

Real oem shows the same drawing you have posted for replacement pipes, these need to be replaced and tightened up correctly due to the damage as shown in the photo.

The issue you describe is that of the pedal loosing pressure the way pressure is lost is a leak or a passing seal, not a pipe unless it has a leak.

 

[yct1012]

With the info you have posted <br style="user-select: auto;"><br style="user-select: auto;">Real oem shows the same drawing you have posted for replacement pipes, these need to be replaced and tightened up correctly due to the damage as shown in the photo.<br style="user-select: auto;"><br style="user-select: auto;">The issue you describe is that of the pedal loosing pressure the way pressure is lost is a leak or a passing seal, not a pipe unless it has a leak.

Thank you for your reply.
the garage guy said the two brake pipes on my z4 is not the correct model, which cause the loosing pressure problem
Is he correct? Or any similar design is also okay?
I search for spare parts, and I found him used brake pipes from 3.0 z4 2003, but garage guy is not able to put it on my z4 because the length & shape is just different.
Any other cars share the same pipes?
may I know any instructions or suggestions that I can give to the garage guy?

 

[PDJ]

Use your vin number at a BMW dealer to buy the correct 2 pipes, to recover the damage to the pipes.

Unless the pipe has a hole or a leak at the connection point it is not the pipe that is dropping the pressure.

There is a leak or passing seal in the system.

 

[brillomaster]

Am i being silly, or does the second pic not have any brake pressure sensors? A whole load of brake fluid leaked out of them when i changed them...

 

[yct1012]

Use your vin number at a BMW dealer to buy the correct 2 pipes, to recover the damage to the pipes.<br style="user-select: auto;"><br style="user-select: auto;">Unless the pipe has a hole or a leak at the connection point it is not the pipe that is dropping the pressure.<br style="user-select: auto;"><br style="user-select: auto;">There is a leak or passing seal in the system.

BMW dealer need a month to ship this to my country.
Do you mean that there will be no problem if the "Pipeline with pressure hose" is connected, no matter if it is not the original one
I dont see what you mean by "passing seal", can you explain more?
According to the garage guy, there arent any brake oil leakage.

Thank you

 

[yct1012]

If anyone are driving a facelited z4 e85
Can you please share a photo of your z4’s master cylinder and brake pipes (just like the picture I shared)
Because there are some differences between the facelifted and pre-facelift version
Me and the garage guy need your photo to help with investigating the problem

Many thanks!

 

[ph001]

Am i being silly, or does the second pic not have any brake pressure sensors? A whole load of brake fluid leaked out of them when i changed them...

Facelift cars don’t have pressure sensors on the master cylinder.

 

[yct1012]

Am i being silly, or does the second pic not have any brake pressure sensors? A whole load of brake fluid leaked out of them when i changed them...

Facelift cars don’t have pressure sensors on the master cylinder.

Can you share some photo as reference
Please, really need your help

 

[yct1012]

Am i being silly, or does the second pic not have any brake pressure sensors? A whole load of brake fluid leaked out of them when i changed them...

Facelift cars don’t have pressure sensors on the master cylinder.

Real OEM shows the same drawing for pre-facelift & facelifted e85 (regarding the brake pipe)
I can see you’re also driving a facelifted z4, can you share a picture of your master cylinder & the brake pipes (like the photo above)
So that my garage guy can fix my Z4 with this reference

 

[Matty_Z4]

Am i being silly, or does the second pic not have any brake pressure sensors? A whole load of brake fluid leaked out of them when i changed them...

Facelift cars don’t have pressure sensors on the master cylinder.

I may look like a fool for this as you genuinely know the ins and outs of these cars along with other members. I just drive them.

But I think Brillo might have a point that the incorrect master cylinder has been installed.

Pic showing pressure sensors installed on OP car.


Pic with no pressure sensors and look at the bend on that pipe compared to the original photo.


Educate me please.

 

[ph001]

This is what should be fitted on all facelift cars...