MCB

😆 yum yum ! Thank you for your time investigating and replying Alasdair. The tsi has no pcv valve. Instead it has a matrix the oil has to travel through apparently. I’m going to try to determine if it is coming through the servo. I guess it must be. So hopefully replacing that will fix it. It’s a very scary and dangerous thing for it to suddenly fail while driving and I must solve this. Thank you

Thank you Pete. I’ll check it out tomorrow. I guess they’re will be ‘fluid’ in the servo now though it is working properly for the time being. So I’ll need another one again as it’ll fail again before too long. I’ve been having used ones put on. They work fine till they get attached to my car 😆 Any advice on testing to see if it is the master cylinder letting fluid into the servo would be much appreciated indeed. Pumping the break pendle with the cap off the break fluid reservoir ? Thank you for your help. Maybe I’ll get a garage to test n sort it. But I can’t afford them these days at £80 am hr. So knowing exactly what I need them to do is best for me. If replacing the master cylinder is something I can do myself then I’ll do that.

Thank you for replying. There is a black tube coming from the servo and looking at the servo from the front of the car it runs to the left and connects to the engine. There’s a one way valve on that black hose which seems to be working if I blow and suck into it, but there is also oil in that section of hose before it reaches the valve. I’m not sure which hose you are referring too ? Where is the vacuum pump ?

Breezy_Pete , should I replace the master cylinder do you think ?

Hello. Thanks. Yeah maybe, but the break fluid level doesn’t go down. I can’t afford to replace the master cylinder to find out. But then maybe I’d better as i don’t want it to happen again on a motorway sliproad like the first time.

Octavia 1.4tsi 2012 Hello. I’m on my third break servo as two have failed on me now in the last year. There is oil visible in the failed servos and in the air line coming from the servo. Seems it’s getting oil into it from the engine somehow and so the vacuum seal is failing. Very dangerous indeed for the break peddle to turn into a brick when you suddenly loose the vacuum assist when breaking at speed ! I was very lucky not to die or kill somebody the first time. I’m on here now to see if anyone can think of what may be the culprit in the engine that’s letting the oil get into the servo. I’m aware there have an oil matrix instead of a valve on these Tsi engines. But I’ve no idea what I’m visually looking for in the engine. Will the issue be my master cylinder do you think ?

Hello. Has your break servo failed ? I’m asking as I’m on my third break servo as two have failed on me now in the last year. Seems it’s getting oil into it from the engine somehow and so the vacuum seal is failing. Very dangerous indeed for the break peddle to turn into a brick when you suddenly loose the vacuum assist when breaking at speed ! I was very lucky not to die or kill somebody the first time. I’m on here now to see if anyone can think of what may be the culprit in the engine that’s letting the oil get into the servo. I’m aware there have an oil matrix instead of a valve on these Tsi engines. But I’ve no idea what I’m visually looking for in the engine. Will the issue be my master cylinder ?