Ok guys.. now ill explain the situation.. since ive had the golf the brake pedal has felt a little spongy and has had too much pedal travel with minimal response.. i have had a brake fluid service carried out on it and its still the same.. so today i thought id bleed the master cylinder (done it the wrong way round bled the top nipple first then the bottom nipple would this make a major difference) and saw/heard no air be released just brake fluid..
Using the trusty search feature i came accross this post:
From the symptoms you have it's highly likely you have air trapped
in the master cylinder and/or the ABS controller. It's a common problem
with golfs due to the design of the braking system. When I did a fluid
change I suspect I may have let a tiny bit of air into the system which
eventually ended up getting trapped in the master cylinder and ABS pump
and made my pedal near enough travel to the floor before doing
anything. This gave the brakes no feel at all and the whole braking
systems felt soggy and awful. I tried pressure bleeding the system at
least 4 times and still couldn't get them any better. The pedal would
feel hard with the engine off but as soon as you started it it near
enough dropped to the floor. The problem is that the master cylinder
and ABS pump trap any bit of air that passes them during fluid change
and bleeding and this cannot be freed without doing this:
Firstly look/feel along the bottom of the master cylinder below the
fluid reservoir, There is 2 more bleed nipples there (usually with
rubber caps on them). Bleed the lower one first then the upper one. You
should get some air out of here.
If the brakes still don't feel great you will need to get hold of
VAG-COM and run the ABS bleed process. This will prime the ABS pump
(runs the pump for about 10 seconds) then will ask you to open both
front bleed nipples. Do this then press enter on the laptop. It then
asks you to press the pedal down 10 times. Once this is done it asks
you to close the bleed nipples again then it runs the ABS pump again.
You then have to repeat this process about 6 times before it tells you
the ABS bleed process is complete. As I had clear bleed pipes I could
see the air coming out, air that was left in the system after several
I then did a quick pressure bleed of the fronts again for good
measure before seeing if it had helped. I was well happy, no excess
pedal travel (now about 10-15mm free travel), and firm brakes with no
soggy feeling at all. The same if not better than they were when I got
Try bleeding the master cylinder first but ultimately I reckon you will need to run the VAG-COM process'
There are two things im not sure about.. after the abs unit has been primed and the nipples are open it says to press thebreak pedal down 10 times will this not cause all my break fluid to leak? will i need to constantly be topping the bottle up? and secondly the brake fluid that spills into the engine bay will it damage any of the components as i know wht it can do to the bodywork.. just thinking of rubber pipes etc..
Also the post says feel along the bottom of the master cylinder for the two nipples.. does it mean the bottom of the reservoir as the bleeding nipples i used were on a metal piece which came off from the master cylinder with the brake fluid reservoir mounted on the top..
Sorry for the long post guys just want to get to the bottom of this really..