Did the master cylinder go dry and suck in air?
Brake Bleeding Problem, I want to cry at this point!
I have a 2000 B5 S4 NO ESP obviously
Only change to the brakes is B6 S4 front calipers (had them on for 3 years, no issues)
Vag-com shows no codes for ABS pump
I CANNOT get this system bled, issue is with car off, pedal falls to floor first 1-3 pumps, gets normal there after. Car on, falls to floor first 3-5 pumps, only brakes all the way by the floor.
Ok, here's the story...
Took off a front caliper to service it. Put the caliper back on and bought super blue fluid for a nice flush while I was doing the work. Flushed the system and bled it using the old method where a friend pumps and I bleed. Bled from RR, LR, RF, LF, no bubbles after 3 cycles at each corner, still same issue.
Tried pressure bleeding with a power bleeder and combination of a friend pumping. No bubbles, still same issue.
I have an S4 parts car so I decided to replace the booster and brake master, after replacement, bled using same method, including bench bleeding the master and re bleeding while in car...STILL same issue.
Also drove the car on my block and pumping the brakes a few times before slamming them, i got my ABS pump to go off a few times on loose sand...no change.
I want to cry lol...it has been 4 evenings wasted and still cant drive the car
Only change to the brakes is B6 S4 front calipers (had them on for 3 years, no issues)
Vag-com shows no codes for ABS pump
I CANNOT get this system bled, issue is with car off, pedal falls to floor first 1-3 pumps, gets normal there after. Car on, falls to floor first 3-5 pumps, only brakes all the way by the floor.
Ok, here's the story...
Took off a front caliper to service it. Put the caliper back on and bought super blue fluid for a nice flush while I was doing the work. Flushed the system and bled it using the old method where a friend pumps and I bleed. Bled from RR, LR, RF, LF, no bubbles after 3 cycles at each corner, still same issue.
Tried pressure bleeding with a power bleeder and combination of a friend pumping. No bubbles, still same issue.
I have an S4 parts car so I decided to replace the booster and brake master, after replacement, bled using same method, including bench bleeding the master and re bleeding while in car...STILL same issue.
Also drove the car on my block and pumping the brakes a few times before slamming them, i got my ABS pump to go off a few times on loose sand...no change.
I want to cry lol...it has been 4 evenings wasted and still cant drive the car
1 - 8 of 8 Posts
I replaced the master for another working one...it has not gone dry...but i bled it after putting it in, best as i could.
You'll need either a push (Motive Pressure Bleeder) or a pull (MityVac) to get the air out, and you need to keep doing it until that air is out...even if it means buying Autozone brake fluid and wasting your SuperBlue. The dealerships bleeds with 2 bar of pressure on the system due to the anti-lock pump. Even after they feel "okay," you still need to drive it and activate the anti-lock pump to get those final bubbles out. I had a hell of a time bleeding my Porsche 6-pot calipers after letting the master cylinder run dry.
Do you know how to activate the abs pump? Vag com method does not work on 2000 s4s... No option for this feature that year... Just says unavailable.Viridia said:You'll need either a push (Motive Pressure Bleeder) or a pull (MityVac) to get the air out, and you need to keep doing it until that air is out...even if it means buying Autozone brake fluid and wasting your SuperBlue. The dealerships bleeds with 2 bar of pressure on the system due to the anti-lock pump. Even after they feel "okay," you still need to drive it and activate the anti-lock pump to get those final bubbles out. I had a hell of a time bleeding my Porsche 6-pot calipers after letting the master cylinder run dry.
2 bar of pressure seems like would explode the reservoir... I guess I might go and pick up a vacuum method pump.
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I was able to do mine without vag-cam. I ended up having to pump the Motive up to 20psi and then pump the brake pedal...I could feel it when it finally started coursing though.
Yea I'm guessing it has to be the abs pump because when you pump the pedal and have your ear up to the pump, should like a squirting sound inside... Kind of like air and fluid... Ugh so frustratingViridia said:I was able to do mine without vag-cam. I ended up having to pump the Motive up to 20psi and then pump the brake pedal...I could feel it when it finally started coursing though.
Sent from Antarctica using Quattro
SOLVED
This is just so if anyone ever has this issue, it was the calipers. After replacing everything else, I decided to replace the NOT leaking or worn really at all calipers. Surprisingly it solved the issue.
This is just so if anyone ever has this issue, it was the calipers. After replacing everything else, I decided to replace the NOT leaking or worn really at all calipers. Surprisingly it solved the issue.
1 - 8 of 8 Posts
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