I'm replacing the pads and rotors on my 2001 A4 Quattro 2.8 and need to know
if I should open the wheel cylinder bleed valve when I reseat the piston.
The Manual says to open the reservior on the master cylinder and nothing
about the bleed valve. I always thought you needed to open the bleeder valve
with ABS. Will I need to have a VAG-Com tool to reset or cycle any thing.
Well I have tried this so there would be no damage to the hoses while resetting
the caliper piston.
I just use a tool, like a broom stick, to slightly hold the brake pedal down
This should stop any flow of fluid back through the system. Then I open the
bleeder valve, reset the piston and close the bleeder valve. Remove broom and
repeat procedure for other calipers.
Of course add more DOT 4 brake fluid before you drive! ;-)
Or you can flush your brake fluid, which would probably be a good thing too!
Is this a safe method?
Before you criticize someone, you should walk a mile in their shoes. That way,
when you criticize them, you are a mile away from them, and you have their
shoes. Frieda Norris
I did mine a few weeks ago.
No need to open the bleed valve.
Just watch out in case the reservoir is already full, as you might spill
some as its pushed back into the reservoir (I took some out using a syringe
Also you need to use a TOOL to reseat the rear pistons as they are a screw
type not a push type (Front are regular push types). There are plenty of
aftermarket tools that do this job.
I tried a few things but gave up as the piston was so tight.
John UK A6Q 2.8
I've read that it is a good idea to open the bleed valve on abs-equipped
cars, as there's a *small* risk of damaging the pump with back pressure
if you don't. Given the price of abs pumps, I wouldn't risk not opening
the bleed valve if it was me. Never done it on an abs car though.
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