I've had an issue with my brakes since I had to replace the rear calipers - even with the engine off, the pedal is very soft. The first time you press it, it goes to the floor with minimal resistance. After that, it's a bit better but still really soft but if you wait a few seconds it will again go to the floor with almost no resistance.
I've done the following in an attempt to fix this:
- bled the system (about 20 times) using manual, gravity and pressure bleeding
- replaced the rear calipers with ones from a working A3
- replaced the master brake cylinder twice (one off a working A3, one brand new from Audi)
- bled the ABS pump via VCDS
- replaced the ABS pump
I've also left the system pressurised for hours and checked for leaks along the brake lines and calipers.
I can even clamp all 4 brake pipes and the pedal is still soft.
Also, the brake lights now stay on permanently (with ignition on) but I suspect this is probably the brake light switch due to having pumped the brakes so many times.
Does anyone have any other ideas what it could be?
I've done the following in an attempt to fix this:
- bled the system (about 20 times) using manual, gravity and pressure bleeding
- replaced the rear calipers with ones from a working A3
- replaced the master brake cylinder twice (one off a working A3, one brand new from Audi)
- bled the ABS pump via VCDS
- replaced the ABS pump
I've also left the system pressurised for hours and checked for leaks along the brake lines and calipers.
I can even clamp all 4 brake pipes and the pedal is still soft.
Also, the brake lights now stay on permanently (with ignition on) but I suspect this is probably the brake light switch due to having pumped the brakes so many times.
Does anyone have any other ideas what it could be?