Soft Brake Pedal

[a_Y]

i am plagued by a soft brake pedal problem that I can't solve and want to see if any of you guys can help. The brake pedal is soft and I mean really soft even compared to other e46 m3's or normal BMWs. I have bled the system, changed fluid, bled the system again. I then thought it was a vacuum leak so I had vacuum hoses and brake booster changed. I am still having this problem and it won't go away. Next thing I am going to try is having the master cylinder changed.

Any one have any clue as to what this problem may be?

[cslsuperfan]

Originally Posted by a_Y

i am plagued by a soft brake pedal problem that I can't solve and want to see if any of you guys can help. The brake pedal is soft and I mean really soft even compared to other e46 m3's or normal BMWs. I have bled the system, changed fluid, bled the system again. I then thought it was a vacuum leak so I had vacuum hoses and brake booster changed. I am still having this problem and it won't go away. Next thing I am going to try is having the master cylinder changed.

Any one have any clue as to what this problem may be?

A_Y

you should be able to get a seal kit for the master cylinder

If there's no obvious fluid leaking onto the floor then it could be fluid getting back past the master cylinder piston under braking. Not a common fault but worth a look.

[glendog74]

Originally Posted by a_Y

i am plagued by a soft brake pedal problem that I can't solve and want to see if any of you guys can help. The brake pedal is soft and I mean really soft even compared to other e46 m3's or normal BMWs. I have bled the system, changed fluid, bled the system again. I then thought it was a vacuum leak so I had vacuum hoses and brake booster changed. I am still having this problem and it won't go away. Next thing I am going to try is having the master cylinder k

Any one have any clue as to what this problem may be?

You need AP brakes

[a_Y]

Originally Posted by cslsuperfan

A_Y

you should be able to get a seal kit for the master cylinder

If there's no obvious fluid leaking onto the floor then it could be fluid getting back past the master cylinder piston under braking. Not a common fault but worth a look.

I have ordered a new master from the dealer today.. let's see if this works...

Originally Posted by glendog74

You need AP brakes

next step! i need to get this sorted before getting that!

[billyboysm3]

Did you bleed the brakes or did BMW ?

[CraigMillwardCroft]

Originally Posted by billyboysm3

Did you bleed the brakes or did BMW ?

Who's at fault

[a_Y]

Originally Posted by billyboysm3

Did you bleed the brakes or did BMW ?

BMW both using a power bleeder and doing it manually

[billyboysm3]

I reckon they have done it wrong. You and a mate need to do it and really stamp on the peddle pushing it all through. BMW always make it limp.

[billyboysm3]

They have done it correct but not to anyone's liking

[a_Y]

Originally Posted by billyboysm3

I reckon they have done it wrong. You and a mate need to do it and really stamp on the peddle pushing it all through. BMW always make it limp.

Can you kindly explain what is the correct way? Thanks!