Hello  all,

 I'm hoping you can help me identify and solve problem with my  Octavia 1.9 TDi, made in 2006.

I changed servo brake booster on my car because the pedal was rock hard and I heard hissing sound from the pedal area when pedal was pressed.

My old servo brake booster had a catalog number 1J1614105AB and I changed it with new one with catalog number 1J1614106J because the old one can`t be bought any more.

After I change it I bleed brakes on the wheels twice and I am not satisfied with brakes now.

First, brake pedal is about 4-5 cm lower then before.

On idle, all the time hissing sound is heard, when I press the pedal sound disappear then as soon as I let off it returns.

Brake are working fine, but pedal is not so hard like it should be (I think), when I hold it depressed it slowly going down.

 

My thinking now is… I will remove master brake cylinder and try to extend shaft which is going from brake booster in to the master brake cylinder, with that I hope I will get pedal in the higher position.

I read that it is good to bleed ABS module with VCDS procedure, but my cable is not working now when I need it.

 

What do you think about this?

 

 

Edited 17 October, 20187 yr by betmen

@betmen - No idea about the rest of it, but I'd expect the pedal to be lower with a working vacuum servo than with a failed one.

 

I presume that, if you pump the pedal hard engine off, then leave your foot resting on it and start the engine you feel the pedal sink.

1 minute ago, KenONeill said:

@betmen - No idea about the rest of it, but I'd expect the pedal to be lower with a working vacuum servo than with a failed one.

 

I presume that, if you pump the pedal hard engine off, then leave your foot resting on it and start the engine you feel the pedal sink.

 

Second is like you said, new vacuum servo is working, but I think that pedal is to low, it`s not in line withe clutch it`s about 4-5 cm lower, not like before