Audi Repair Questions? Ask a Mechanic for Answers ASAP
Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.
Actually, brake bleeding needs to be done with calipers and pads in place.
how exactly did you perform the brake bleed?
well I put the bleeder tool in the hole by the caliper and let it suck all the fluid out and now the claiper is clamped down on the rotor
Well, each caliper has a bleed screw that fluid flows through.
I might have also mashed the brake pedal
right.. both the back ones are locked down
what bleeder tool did you use? A vacuum bleeder? Did you continue to fill the master cylinder reservoir during this process?
meaning the rear bleeder screws were frozen in the calipers?
Oh no.. The screws came out.. It was one of those tools where you stick the little hose in the a holes for the bleeder screws and it sucks out the fluid via natural 'non-mechanical vacuum'
I did not fill the fluid as I was draining it though
Ok, so we've got a few problems here
1) you've got a LOT of air in the system due to not refilling as you went
2) an as of yet undiagnosed locked caliper
both rears are now locked down, correct?
Yeah I knew I was forgetting something.. I was thinking that maybe the caliper is locked due to something electrical?
definitely not electrical, on a 2000
rear calipers get locked for 3 reasons
1) parking brake cable or lever is stuck2) sliders are corroded3) caliper piston is stuck, which will require another special tool to determine
also, with the pedal application "mashing the pedal" during this process....
Aaaaaaah! I think I did have the parking brake still engaged before I started!
well, I'd gently suggest that possibly a tow to a shop would be the quickest and most cost-effective solution here
however, I'll do my best to help out
Let me run and check.. Be back in 30 seconds
however, please understand the limitations of doing this through the computer screen
and when you get back, even if you find the parking brake locked, you still likely have air in the system
and it will need to be bled out properly
YTeah the brake was on
ok, that was easy enough
now, is there still fluid in the reservoir?
I could still feel the brakes are locked down
Yes there is still some fluid left in the reservoir
ok, that's good.
sounds like you're out of the woods
but fill the reservoir!
so you don't get air into the system
Well there's not a lot of fluid left in the reservoir but there is a little
ok, fill it with DOT4 fluid
What should I do after that?
well, if you've bled out the fluid properly, and the pedal feels ok, you're done
THe brakes will just unlock then?
well, I thought you said the e-brake was on?
Yeah it was I took it off but I stuck my hand in the wheel basin to feel the brakes and they are still locked down
feel the brakes? Can you physically turn the rotor?
ok, is the emergency brake lever on the inside of the caliper resting against its stop?
Let me go look real quick
That's the white nub right?
Everything looks as it did before I started bleeding the brakes except for the pads are pressed against the rotor so that it can't move
The pads always look like they're pressed against the rotor. Try this. Throw a wheel on, screw in a bolt, try to spin the wheel. There will be some resistance, due to it being a Quattro, but if you can spin it without a lot of effort, everything is ok
ok.. Hold on a sec
Yeah I can spin it
it's fine. There's always a bit of friction between the pads and rotor on any car
it takes more effort to try to spin the rotor without the weight of the wheel/tire assisting
So all I have to do now is just bleed it again and remember to put fluid in as I do so ?
why bleed it again?
if there was still fluid in the reservoir, and the pedal feels good, I'd suggest not
WEll I have to get the air out of the system right?
I assumed you ran the reservoir dry
if the pedal feels good, with engine running, there is no air
No there was about an half inch of fluid left..
yes, I understand that
Hold on a sec..
ok, but I do need to sign off shortly
Ok so the brake pedal goes all the way down with ease
Ok, it needs a proper bleed, and that means not using the tool you're trying to use
which also means 2 people need to be involved
I'm sure the pedal mash didn't help
Yeah I imagine not
Ok cool thanks for all your help
Bookmark this for future reference
and let me know when you're preparing to tackle a job on an Audi
Now, two person brake bleeding
let me link you to a video