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Paul Mainey
Tinkerer
nsw
V8

Posts: 94
Reg: 06-2006

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 Wednesday, August 20, 2008 - 07:00 am, by:  Paul Mainey (Gttv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I have a problem with my brakes. It's like the booster is not working properly, although i replaced the booster hoping this was the problem. The brake pedal is quite firm and at low speeds if you hit the brake pedal as hard as you can it only rolls to a stop. Under normal driving conditions it will stop the car and has passed the brake test for rego, but it's not what it should be.

Any ideas on what could be causing this problem?

Cheers
Christian Molenda
DieHard
QLD
T

Posts: 832
Reg: 07-2005

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 Wednesday, August 20, 2008 - 07:16 am, by:  Christian Molenda (Christof) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Lack of Vacuum or vacuum leak to brake booster
Paul Mainey
Tinkerer
nsw
V8

Posts: 95
Reg: 06-2006

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 Wednesday, August 20, 2008 - 02:29 pm, by:  Paul Mainey (Gttv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
I can't detect any vacuum leaks to the booster. Could there be a problem with the ABS?
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 9838
Reg: 11-2004

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 Wednesday, August 20, 2008 - 03:44 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Unlikely as the ABS only kicks in when the amount of braking causes the wheels to lose traction.

Does your car have TRC? If so, it could be the accumulator. If not, then as Christian said, look for vacuum leaks.
Paul Mainey
Tinkerer
nsw
V8

Posts: 96
Reg: 06-2006

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 Wednesday, August 20, 2008 - 08:03 pm, by:  Paul Mainey (Gttv8) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
Yeah, I wasn't sure if there may be some solenoid that wasn't opening completely in the ABS unit.

The car doesn't have TRC. I've gone over the vacuum lines again tonight and I can't see or hear any leaks.

Another symptom is that the pedal takes a short time to return to the neutral position after braking.

I think i might have to take it to the professionals.
Matthew Sharpe
Goo Roo
North Island
JZZ31

Posts: 3687
Reg: 10-2005

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 Thursday, August 21, 2008 - 09:19 am, by:  Matthew Sharpe (Madmatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)
If you have ruled out the servo then it sounds like its an air trap or fluid pressure issue to me - if you are satified that the system is properly blead, then maybe its a leaking or faulty master cylinder?

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