Brake fluid pressure issues plz help
Thread Starter
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Joined: Nov 2009
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Brake fluid pressure issues plz help
PROBLEM SOLVED**
Hi guys,
I took my car at a performance shop to install my new rotors, pads, stainless steel lines as well as bleed the brakes and put new fluid.
They say they are having a lot of issues with the pressure in the pedal and repeated the bleeding pressure a couple of times using different techniques and tools with always fair but not optimal results (pedal feeling not as stiff as before).
The max brake fluid pressure they could get was 10 psi.
Can anyone let me know what tools and pressure you use when bleeding your brakes.
Anything help would be appreciated I'm tracking the car in 2 days so I'm desperate to find a solution.
thanks
Hi guys,
I took my car at a performance shop to install my new rotors, pads, stainless steel lines as well as bleed the brakes and put new fluid.
They say they are having a lot of issues with the pressure in the pedal and repeated the bleeding pressure a couple of times using different techniques and tools with always fair but not optimal results (pedal feeling not as stiff as before).
The max brake fluid pressure they could get was 10 psi.
Can anyone let me know what tools and pressure you use when bleeding your brakes.
Anything help would be appreciated I'm tracking the car in 2 days so I'm desperate to find a solution.
thanks
Last edited by chief63; Jul 13, 2010 at 06:43 PM.
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From: 43°38'N / 79°52'W
EuroCharged 2012 C63 BS Coupè
Hey Chief, I could not reach my Tech. left a message. I seam to remember it being 2000psi front and 950>1000psi rear but let me confirm.
Your OEM lines were rated for 6000psi and the new SS are rated at 10000psi
Your OEM lines were rated for 6000psi and the new SS are rated at 10000psi
Thread Starter
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Joined: Nov 2009
Posts: 690
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Well the master cylinder handles that, I was talking more about the brake fluid pressure when flushing the lines. I've read anywhere from 10 psi to 30 psi which is a huge difference. Too litltle pressure will make the pedal sloppy. They are pretty positive that there is no air in the lines (tested numerous times).
thanks
Thread Starter
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Joined: Nov 2009
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
I'v just read 25 to 30 psi from here http://www.benzworld.org/forums/w210...ml#post2271335
they say if not it won't work properly.
Can anyone confirm this?
thanks
they say if not it won't work properly.
Can anyone confirm this?
thanks
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S65
How are they bleeding the brakes? With a brake bleeder, gravity, etc?
Sounds like you've got some air trapped in the system, somewhere. This could easily happen if they let the brake system run dry while they were changing out the lines. Air may well be trapped in the ABS pump...? I know FORDs (heresy, I know), will require dealer tools to cycle the ABS pump if you run it dry.
Sounds like you've got some air trapped in the system, somewhere. This could easily happen if they let the brake system run dry while they were changing out the lines. Air may well be trapped in the ABS pump...? I know FORDs (heresy, I know), will require dealer tools to cycle the ABS pump if you run it dry.
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MBWorld Fanatic!
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From: 43°38'N / 79°52'W
EuroCharged 2012 C63 BS Coupè
Hey Barry,
Well the master cylinder handles that, I was talking more about the brake fluid pressure when flushing the lines. I've read anywhere from 10 psi to 30 psi which is a huge difference. Too litltle pressure will make the pedal sloppy. They are pretty positive that there is no air in the lines (tested numerous times).
thanks
Well the master cylinder handles that, I was talking more about the brake fluid pressure when flushing the lines. I've read anywhere from 10 psi to 30 psi which is a huge difference. Too litltle pressure will make the pedal sloppy. They are pretty positive that there is no air in the lines (tested numerous times).
thanks
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Thread Starter
Super Member
Joined: Nov 2009
Posts: 690
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
How are they bleeding the brakes? With a brake bleeder, gravity, etc?
Sounds like you've got some air trapped in the system, somewhere. This could easily happen if they let the brake system run dry while they were changing out the lines. Air may well be trapped in the ABS pump...? I know FORDs (heresy, I know), will require dealer tools to cycle the ABS pump if you run it dry.
Sounds like you've got some air trapped in the system, somewhere. This could easily happen if they let the brake system run dry while they were changing out the lines. Air may well be trapped in the ABS pump...? I know FORDs (heresy, I know), will require dealer tools to cycle the ABS pump if you run it dry.
I have read a lot about air in the ABS pump as you suggested and it makes sense. Still can anyone who changed their lines chime in? Does the abs pump need to be serviced when changing the lines?
Now I'm scared to drive the car and break the pump if that's the case. Taking it to the dealer tomorrow.
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S65
When I bleed brakes on my vehicles I don't go over 10PSI. No need to, really. 10PSI is more than enough to move the old fluid through the brake lines. It may take a minute longer on the passenger rear caliper, but eh.
I would really be concerned about that ABS pump. It may not be air trapped in the unit, but I wouldn't risk driving it like that. I'm sure the dealership can square you away (after you give them some of your green)
I would really be concerned about that ABS pump. It may not be air trapped in the unit, but I wouldn't risk driving it like that. I'm sure the dealership can square you away (after you give them some of your green)
Thread Starter
Super Member
Joined: Nov 2009
Posts: 690
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
When I bleed brakes on my vehicles I don't go over 10PSI. No need to, really. 10PSI is more than enough to move the old fluid through the brake lines. It may take a minute longer on the passenger rear caliper, but eh.
I would really be concerned about that ABS pump. It may not be air trapped in the unit, but I wouldn't risk driving it like that. I'm sure the dealership can square you away (after you give them some of your green)
I would really be concerned about that ABS pump. It may not be air trapped in the unit, but I wouldn't risk driving it like that. I'm sure the dealership can square you away (after you give them some of your green)
best regards
Out Of Control!!
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From: OC
a quarter mile at a time
They had a power bleeder but did not have the adapter for my car so made it fit but the machine they had could not go more than 10 psi.
I have read a lot about air in the ABS pump as you suggested and it makes sense. Still can anyone who changed their lines chime in? Does the abs pump need to be serviced when changing the lines?
Now I'm scared to drive the car and break the pump if that's the case. Taking it to the dealer tomorrow.
I have read a lot about air in the ABS pump as you suggested and it makes sense. Still can anyone who changed their lines chime in? Does the abs pump need to be serviced when changing the lines?
Now I'm scared to drive the car and break the pump if that's the case. Taking it to the dealer tomorrow.
Thread Starter
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Joined: Nov 2009
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Hi guys,
Got the new tires installed this morning and in the meantime called every MB dealer, the soonest I could get an appointment was Thursday so a bit late for me.
My family knows a certified MB garage and they accepted to take me in last minute.
So far the first thing they noticed was that the stainless steel lines were not installed correctly. Wether this is the issue or not, it seems very likely.
They will have to fix everything and purge the system once more. I'll know later today if its fixed and keep you posted on the issue.
I'm just pissed right now at the other performance shop. They work on race cars (audis, bmws, etc) so I'm surprised they messed things up. But this has been the second time something happens so I will deal with the new shop from now on if they do a good job.
If the problem persists I'll visit the dealer this Thursday but miss tomorrow track day at Calabogie.
Got the new tires installed this morning and in the meantime called every MB dealer, the soonest I could get an appointment was Thursday so a bit late for me.
My family knows a certified MB garage and they accepted to take me in last minute.
So far the first thing they noticed was that the stainless steel lines were not installed correctly. Wether this is the issue or not, it seems very likely.
They will have to fix everything and purge the system once more. I'll know later today if its fixed and keep you posted on the issue.
I'm just pissed right now at the other performance shop. They work on race cars (audis, bmws, etc) so I'm surprised they messed things up. But this has been the second time something happens so I will deal with the new shop from now on if they do a good job.
If the problem persists I'll visit the dealer this Thursday but miss tomorrow track day at Calabogie.
Thread Starter
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Joined: Nov 2009
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
I'll see what they come up with.
On the good side, the evosport rotors were installed and they are amazing. The look is sick and the car feels so light its insane. I'd say it's having at least 200-300 pounds off the car. They say to multiply rotating mass saved by 10, so yeah it does feel 400 pounds lighter, definitely as if I had dropped off 2 guys like me or 4 slim girls, but then again I wouldn't drop em off LOL
Last edited by chief63; Jul 13, 2010 at 01:02 PM.
Thread Starter
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Joined: Nov 2009
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Just talked to the garage. They reinstalled the stainless lines, they did the brake fluid change follow all the MB specs. No air in the lines, no air in the master cylinder or abs pump. They said the pedal still feels soft. I am going there for a test drive.
Speaking to the initial guys who made the install, they mentionned everything was fine when they installed the front rotors and pads (taken for a test drive) with the evosport shims.
So its either the lines, fluid or rear rotors and pads. Something interesting they mentionned is that the titanium shims in the back did not fit very well, and there is somewhat of a loose of 1/16 inch. X 2 that 1/8 inch. That's huge when talking about brakes.
I told the new garage to remove the shims in the back so I will see if that could be the source of the problem.
I was also mentionned that Evosport 2 piece rotors are floating disks, and the pedal might be less responsive on initial push. Can anyone confirm?
thanks
Speaking to the initial guys who made the install, they mentionned everything was fine when they installed the front rotors and pads (taken for a test drive) with the evosport shims.
So its either the lines, fluid or rear rotors and pads. Something interesting they mentionned is that the titanium shims in the back did not fit very well, and there is somewhat of a loose of 1/16 inch. X 2 that 1/8 inch. That's huge when talking about brakes.
I told the new garage to remove the shims in the back so I will see if that could be the source of the problem.
I was also mentionned that Evosport 2 piece rotors are floating disks, and the pedal might be less responsive on initial push. Can anyone confirm?
thanks
Thread Starter
Super Member
Joined: Nov 2009
Posts: 690
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
After checking everything, the original installer mentionned the evosport shims in the back had very loose fitting that creating 1/16 in space on each side because no holes were pre drilled (like the ones in the front). I'll see what's the issue with evosport.
Ta da, remove the back shims and its fine now. The braking is amazing. I love the mod so far. Calabogie here I come!
Ta da, remove the back shims and its fine now. The braking is amazing. I love the mod so far. Calabogie here I come!
Thread Starter
Super Member
Joined: Nov 2009
Posts: 690
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From: Montreal, Canada
2021 Taycan Turbo, 2018 Radical SR3, 2021 Lincoln Aviator
Getting power bleeder ASAP
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Audi's, a whole bunch of them
lets see those vids, when u get a chance pls
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Found the sweet spot on the RE-11's to right at 41psi HOT running Nitrogen
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People saying 41 psi is high, well I'd say 41 psi hot was about a cold 32-34 psi in my case and really a very good sweet spot.
