brake master cylinder

1. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #1 16th December 2011, 19:26

   I was wondering if any1 could tell me how would I know if my master cylinder is damaged/broken the reason I ask is because when I apply the brakes it feels as if the pedal sinks the longer u hold the brakes and you have to pump the pedal to build pressure up if you know what i mean, Ive got pretty much new discs and pads all the way round so I know they arent a problem. Cheers
2. marrygold Regular Poster Joined: Aug 2010 Posts: 330

   #2 18th December 2011, 07:26

   Bleed em and take up the slack on the bar that runs across from your pedal to your servo,under the bonnet.just the slack.
   you could change your fluid if its been in there for a while,as moisture get in from the air.
3. ads85 Frequent Poster Joined: May 2011 Bradford on Avon,Nr Bath Posts: 866 '01 astra coupe

   #3 18th December 2011, 07:47

   It does sound like you have some air in the system, as above give them a good bleed until the pedal is firm again, if the pedal goes spongy in time after this i'd imagine there is a problem with the seals on the master cylinder, either replace the seals or look at the cost of a new m/c.
   
   Hope this is of some use
   
   Ads
4. Ben_SaxoForte Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project

   #4 18th December 2011, 18:11

   cheers i will have a look at bleeding them when I get the time, probably be next year now though they aren't dangerously bad anyway just a bit spongy lol.