do i have ps pump problem?

[aronmatic2]

i am trying to figure out, what is the problem.
my brake pedal is resonating, when i push it. the engine on, abs off.
on higher rpm, its resonating faster.
when i push the pedal fast(hard) not braking so much(like an old peugeot).
when i push slower, the braking is better.
the check control is beeping and shows the brake pressure low sighn.

any idea???

[Cullam3n]

Had the same problem took me months, servo 100%. Replaced the bomb, PS pump, master cylinder, nothing until I did the servo.

[Error404]

I concur! Servo dead.

I've got one if you need it

[Pirvu Eugen]

Servo or bomb not acumulating and losing presure too fast like the pump is pumping throw theose 2 pistons.
the vibration you feel is the pistons pumping.
Can be both off them.
You can make the test by removing the return pipe from the servo and put a plug to it and start the engine.
From the servo you should see nothing more than few drops.
Hope this helps!
Eugen

[aronmatic2]

Had the same problem took me months, servo 100%. Replaced the bomb, PS pump, master cylinder, nothing until I did the servo.

correct me,if i wrong. the servo means the ps pump?
sorry, if my question is stupid
anybody has a picture of it?

[Pirvu Eugen]

no.. The servo is the part behind the Brake master cylinder

[Pirvu Eugen]

http://www.sjmautotechnik.com/trouble_shooting/TSB47_92_2_5.html

Look here!

[aronmatic2]

thanks guys. i do it tomorrow

[Cullam3n]

yup thats the one