Brake servo

1. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

   #1 26th February 2012, 20:30

   When i first bought my vts the brakes were crap, the discs were worn and rusty and the pads were shot to bits, i replaced them with brembo max discs and brembo pads, they work well, i bled them and they were still spongy. I pulled the plug out of the servo and it made a hissing noise and the pedal went really solid and the brakes were fantastic but every day i find myself having to pull it out to get the brakes back, is it a seal gone or is my servo knackered?
2. user_39821 Saxperience Forum Bum Joined: Dec 2009 Uckfield, East Sussex Posts: 3362 Citroen saxo 1.4 furio

   #2 26th February 2012, 20:33

   The brakes would obviously go solid as you are removing the servo assistance from the system. but the force applied to the calipers will be far less unless you are really standing on them. put the pipe back on
3. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

   #3 26th February 2012, 20:37

   I take the plug out until it stops hissing and then when it stops put it back in, there is a bit of play at the top of the pedal but they are sharp but after about 5 minutes then they go all spongy again
4. user_39821 Saxperience Forum Bum Joined: Dec 2009 Uckfield, East Sussex Posts: 3362 Citroen saxo 1.4 furio

   #4 26th February 2012, 20:48

   The "plug" you are taking out. are you talking about the vacuum hose to the inlet manifold?
5. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

   #5 26th February 2012, 20:54

   Yes that is the one! sorry my bad!
6. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #6 26th February 2012, 21:05

   its supposed to hiss theres vacuum inside the servo so its just filling with air when you pull the plug
7. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

   #7 26th February 2012, 22:09

   It does hiss, then stops and the brakes are fantastic but i get down the road and they are back to not so good, pull it out and it hisses again
8. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #8 26th February 2012, 23:25

   Thats totally normal for it to hiss when you pull the plug, when you start the engine again it builds up the vacuum again in the servo.. don't understand why it feels better for a while though could possibly have a leak. I've got a similar problem with mine but mine effects the revs on the engine at the same time.. weird one!
9. user_39821 Saxperience Forum Bum Joined: Dec 2009 Uckfield, East Sussex Posts: 3362 Citroen saxo 1.4 furio

   #9 27th February 2012, 08:38

   It will feel much firmer, but the brakes will not perform better
10. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

    #10 27th February 2012, 22:45

    Well the brakes are at the top of the pedal instead of the middle! Much firmer! But what i want to know is is it leaking and if so where from? If anyone has had this problem before
11. chinkostu Saxperience Post Whore Joined: Aug 2008 The wrong carpark Posts: 5152 Xantia 1.9TD

    #11 28th February 2012, 08:46

    no its not leaking, the sponginess will be down to either air or you need to adjust the bar that runs from the pedal to the servo. all you're doing by removing the vacuum is removing the servo, like trying to brake without the engine on. why it feels better for a little bit after you reconnect it is beyond me

    1 user thanked this post: elmartha
12. user_21226 Saxperience Post Whore Joined: Feb 2008 wirral Posts: 6348 Icelandic vtr turbo

    #12 28th February 2012, 08:47

    I'd recommend rebleeding your brakes bud and make sure you do a proper job
13. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

    #13 28th February 2012, 10:57

    Have been bled 4 times and there was no air in them at all, was thinking of putting better fluid in it so shall do it again then to see if that makes a difference, if not i shall adjust the pedal
14. elmartha Infrequent Poster Joined: Apr 2011 Horncastle, Lincoln Posts: 171 Mk2 Vts mk1 front end Mk1 Mitsubishi GTO TT

    #14 28th February 2012, 15:50

    Adjusted the pedal, they are much better, sharp as a stanley knife now still going to put some ATE super blue fluid in it and braided hoses