Bleeding brakes: pressure or vacum?

[Sincity]

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.

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[MBTHEONE]

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.

[Gullwing]

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

[MBTHEONE]

Wow! Sweet find and thanks for sharing that. I'm printing that out as we speak

[Sincity]

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.

[Gullwing]

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

[ESPoff]

pressure bleed off the master seems to be the fastest and easiest way, just make sure u bleed in the right order haha

[uberwgn]

Originally Posted by Gullwing

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

MBz requires a pressure bleeder.

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 Good god. (VWs are bled at 14 psi vs. the 30 required for MBz.) We priced out the new reservoir and it was nearly $100.

[Sincity]

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.

[E55 KEV]

any used this Motive or have any thoughts?

http://store.motiveproducts.com/shar...CS=motive&All=



What tool is used on the caliper bleed screw fro W210? Thanks.

[Gullwing]

Originally Posted by E55 KEV

What tool is used on the caliper bleed screw fro W210? Thanks.

8mm? 9mm? 10mm? wrench can't remember which it is, but that is all it takes.

[Real1shepherd]

Originally Posted by Sincity

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.

OK, but there's a concern about using a power bleeder like you have (from each caliper) and forcing the fluid through the ABS system (if fitted). I bought the same system you have that works off a compressor and has the 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