Simon_Blackburn
Member
I’m not an expert in these things but I had to go through a very expensive brake servo replacement on our FSI as a result of air leaking past the shaft (you could hear it in the cabin). Not only did it make an annoying hiss, it also deprived one of the four pumps of reserve that a servo should keep up its sleeve should the engine stop. The air leak also (unsurprisingly) upset the FSI’s very fragile engine management system.
The new (well, second hand) one worked fine but you could hear a squeak when releasing the pedal, which felt like it was being ‘dragged’.
Having bought the ridiculously expensive silicone spray lubricant for my OSS, I removed the lower dash panel and sprayed the area where the shaft goes through the rubber, working the pedal a bit.
This stopped the squeak and noticeably reduced the drag.
It led me to wonder whether in fact the old one had ‘torn’ because that area went dry, eventually depriving the seal of its air-tightness?
If I am right, this is a really easy bit of preventative maintenance that will save hundreds in bills if the servo has to be replaced.
The new (well, second hand) one worked fine but you could hear a squeak when releasing the pedal, which felt like it was being ‘dragged’.
Having bought the ridiculously expensive silicone spray lubricant for my OSS, I removed the lower dash panel and sprayed the area where the shaft goes through the rubber, working the pedal a bit.
This stopped the squeak and noticeably reduced the drag.
It led me to wonder whether in fact the old one had ‘torn’ because that area went dry, eventually depriving the seal of its air-tightness?
If I am right, this is a really easy bit of preventative maintenance that will save hundreds in bills if the servo has to be replaced.
