Pwskii

I had a good look around all the vaccum pipes and checked one way valve. They all look good which leaves me with faulty diaphgram. I have found Bosh brake servo on euro car parts (Part Number: 131440477) using Reg Plate search. I burned myself once using it and was wondering whether anyone purchased one or can verify whether this one would fit 1.9tdi ASZ.

Thanks guys for all the responses. My plan of action will be to first of all inspect all the vacuum hoses and pay particular attention to one way valve. I might consider replacing it. My next step will be to look into servo itself. I think the only option is to replace it "Goaal!!". As it is a sealed unit. Unless any of you guys know how to test it. I will keep you posted of progress and eventually a solution. P.s. Guys it's coming home

Thanks for a reply JR. I bled both nipples and then straight after all round. But issue remains the same. I am intrigued what is causing pedal to lift and go stiff with air hissing sound. Hence I am considering ABS bleed as this is unit that is designed to aid brakes. I could be wrong I am trying to connect the dots.

I will have a good look around today. I will try to get in hold of VCDS and bleed ABS.

I flushed them first to get fluid in front calipers and then I pressure bleed from furthest point to nearest point. So RL RR FL FR. I did classic pedal pumping technique.

Yes.

Hi, I've drove it on a industrial estate to test drive it, trying to establish what is happening. So I've replaced everything. Also brake cleaned everything dry after to observe for leaks. Nothing, fluid level is perfect.

Hello fellas, I am writing to you as I've run out of ideas of what is wrong with my 2004 Skoda Octavia mk1 1.9TDi PD (ASZ). Issue as title say is with brakes. I took it upon myself to replacement pistons in my front calipers. I have decided that for the safety of brake pipes it will be safer to remove it and do it of the car. I disconnected pipes and blank them with nipped bolt and nut on connections. I've changed pistons, no issues encountered it went as smoothly as I expected it. My problem occured after I bleed brakes. So, issue is that when I am driving and begin to brake, initially all happens as expected and the car slows as expected, then after about 3-4 seconds you can hear hissing and brake pedal begins to lift and automatically I am loosing control of braking as they are no longer as effective as the were before pedal lifted, now I either have to slam them hard or let foot of the brake for a second and repeat the process. Now, prior to that brakes were working fine apart from binding. Anyone willing to share some experience when it comes to brakes, servos and before I fried my brain for the day i was reading about "Brake Booster pressure sensor" Any help would be greatly appreciated. Pat.