Frau Frankenbenz not stopping on a dime - PeachParts Mercedes-Benz Forum

origamitect · #1 01-08-2006, 03:50 PM

OK, so I checked the vacuum hose just before the booster with all vacuum accessories attached. Vacuum at the hose is 20" hg. Plugged the same line and tried to turn the key to shut off engine - engine shuts off fine. So - that leaves the seal b/t the m/c and the booster, or the booster itself. Is there any other diagnostic to descriminate b/t the two? Or should I just get a new booster? I assume any further testing will require the removal of both the m/c and the booster. Please verify. thanks in advance.

whunter · #2 01-08-2006, 04:23 PM

It is very simple.
Remove the nuts holding the master cylinder to booster.
Ease the master cylinder away from the booster.
Replace the vacuum seal between them.
Install the master cylinder to booster.
Install and tighten the nuts.

Test the system.

boneheaddoctor · #3 01-08-2006, 07:13 PM

Quote:

Originally Posted by whunter

It is very simple.
Remove the nuts holding the master cylinder to booster.
Ease the master cylinder away from the booster.
Replace the vacuum seal between them.
Install the master cylinder to booster.
Install and tighten the nuts.

Test the system.

Yeah..I bet you find the Indy forgot to put that O-ring between the mastercylinder and the booster.

origamitect · #4 01-08-2006, 09:09 PM

OK, so I pulled the MC away from the booster. No sort of rubber ring to be found. A-Ha! You guys are the best. There are a couple of grooves on the M/C where it touches the front face of the booster, and then there's the cylinder itself that sticks into the booster. Which location does the o-ring go to? and, who knows what size ring I need? The haynes manual doesn't say, and the steaky site is down

. I asked at Autozone, and of course their computer sez "we don't carry that seal..." If this is something I can buy @ a generic place that would be great, since this car is my daily driver. Thanks againg for all your help.

boneheaddoctor · #5 01-08-2006, 09:48 PM

Quote:

Originally Posted by origamitect

OK, so I pulled the MC away from the booster. No sort of rubber ring to be found. A-Ha! You guys are the best. There are a couple of grooves on the M/C where it touches the front face of the booster, and then there's the cylinder itself that sticks into the booster. Which location does the o-ring go to? and, who knows what size ring I need? The haynes manual doesn't say, and the steaky site is down

. I asked at Autozone, and of course their computer sez "we don't carry that seal..." If this is something I can buy @ a generic place that would be great, since this car is my daily driver. Thanks againg for all your help.

it fits over the protusion of the mastercylinder....measure that and you have the size you need from your hardware store. I don't have one I could measure right now.

whunter · #6 01-08-2006, 09:52 PM

Quote:

Originally Posted by origamitect

OK, so I pulled the MC away from the booster. No sort of rubber ring to be found. A-Ha! You guys are the best. There are a couple of grooves on the M/C where it touches the front face of the booster, and then there's the cylinder itself that sticks into the booster. Which location does the o-ring go to? and, who knows what size ring I need? The haynes manual doesn't say, and the steaky site is down

. I asked at Autozone, and of course their computer sez "we don't carry that seal..." If this is something I can buy @ a generic place that would be great, since this car is my daily driver. Thanks againg for all your help.

Attached pictures.

pawoSD · #7 01-08-2006, 10:40 PM

Our 83 had no seal ring of any kind when we took off the M/C, but the brakes worked fine, and were VERY powerful. What does that mean?

We are putting one on when we reinstall it however...

origamitect · #8 01-08-2006, 11:00 PM

Just measured it FYI, those are the measurements for the booster vacuum seal ring. Needs to be 1/8" thick I think, best in some brake fluid resistant material. Now I just need to find the darn compass and cut one from the make your own gasket material... Thanks again guys.

boneheaddoctor · #9 01-09-2006, 08:29 AM

Quote:

Originally Posted by pawoSD

Our 83 had no seal ring of any kind when we took off the M/C, but the brakes worked fine, and were VERY powerful. What does that mean?

We are putting one on when we reinstall it however...

It means you didn't look close enough......and the old O-ring was flat as a pancake....because that is what seals the Booster vacuum in.....you WOULD have a massive vacuum leak without it.