Bleeding brakes: pressure or vacum?
#1
MBWorld Fanatic!
Thread Starter
Bleeding brakes: pressure or vacum?
Which is easier/better? Using a pressure bleeder like a Motive or a vacum system from Mityvac? The reason I ask, is that I just purchased a Mityvac 7300 (uses air compressor to create vacum) to replace my POS Topsider for oil changes and it came with a brake bleeding attachment.
#2
Newbie
Join Date: Jul 2009
Location: Kansas City
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
02 WRX
Does the brake bleed attachment attach at the master cylinder resevoir or at the bleed valves at each caliper?
If it attaches to the caliper you will need to be constantly checking the master cylinder level to be sure you do not suck any air in while bleeding each corner, which can be a pain. While as a pressure bleeder( I use ) you simply attach to MC and bleed each wheel individually. The pressure bleeder I use also has a larger resevoir so there's no need to constantly add brake fluid.
If it attaches to the caliper you will need to be constantly checking the master cylinder level to be sure you do not suck any air in while bleeding each corner, which can be a pain. While as a pressure bleeder( I use ) you simply attach to MC and bleed each wheel individually. The pressure bleeder I use also has a larger resevoir so there's no need to constantly add brake fluid.
#3
Super Member
All I have ever seen used on MB cars are pressure bleeders.
One of these days I will build my own
http://faculty.ccp.edu/faculty/dreed...eder/index.htm
One of these days I will build my own
http://faculty.ccp.edu/faculty/dreed...eder/index.htm
#5
MBWorld Fanatic!
Thread Starter
That is a cool DIY.
I had the same concerns with the vacum type with running up to the front to check the level of the reservoir. I guess that is the only con with it.
I had the same concerns with the vacum type with running up to the front to check the level of the reservoir. I guess that is the only con with it.
#6
Super Member
Back in 04 I bleed the brakes on my 87 190E (half it's life in the 110+ degree summers) 2 bar (30 PSI) pressure no problems. A few months later I tried to bleed the brakes on my 98 Audi A4, after a few minutes the reservoir blew up. Foreman at the Audi dealer told me they have issues with the reservoir blowing up with more then 5 PSI
![crazy](https://mbworld.org/forums/images/smilies/crazy.gif)
Trending Topics
#8
Super Member
Join Date: Mar 2006
Location: Northeast
Posts: 545
Likes: 0
Received 0 Likes
on
0 Posts
e300d
It's weird, I was helping somebody with a '99 Passat last year and the same thing happened...the damn fluid reservoir split and wadda mess
![action](https://mbworld.org/forums/images/smilies/action1.gif)
![action](https://mbworld.org/forums/images/smilies/action1.gif)
#9
MBWorld Fanatic!
Thread Starter
I hope that doesn't happen to the MBZ reservoir. Though my 23 year old 190e reservoir seals recently gave-way and started leaking. Good thing that new reservoirs aren't expensive.
Last edited by Sincity; 07-03-2009 at 11:02 AM.
#10
MBWorld Fanatic!
![](https://mbworld.org/forums/images/ranks/veteran_air_force.png)
any used this Motive or have any thoughts?
http://store.motiveproducts.com/shar...CS=motive&All=
![](https://store.nexternal.com/motive/images/PowerBleeder.jpg)
What tool is used on the caliper bleed screw fro W210? Thanks.
http://store.motiveproducts.com/shar...CS=motive&All=
![](https://store.nexternal.com/motive/images/PowerBleeder.jpg)
What tool is used on the caliper bleed screw fro W210? Thanks.
#11
Super Member
#12
Which is easier/better? Using a pressure bleeder like a Motive or a vacum system from Mityvac? The reason I ask, is that I just purchased a Mityvac 7300 (uses air compressor to create vacum) to replace my POS Topsider for oil changes and it came with a brake bleeding attachment.
I looked at the instructions for power bleeding the ABS system and you make use of a bleed valve on the ABS unit itself. They tell you how to do it in the Bentley Owner's Bible, for example. But my ABS unit has no bleed screw....so I'm not so sure I want to vacuum force fluid through it.
I would try to find some existing instructions (if any), on using a power bleeder for individual brake cylinders on the MB ABS system. Or, you could jury rig the pressure bleeders linked here in the posts.....still need a bleeder valve on the ABS pump.
You don't have to run back and forth to the MC...just have a stooge (or a kid) stand there and put fluid in the reservoir.
Kevin