Rich, OK, I can probably do that. Wouldn't it be similar to test the brake pedal before starting the engine to see if the power assist still works after the car has sat overnight?
-Max -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Rich Thomas Sent: Friday, December 10, 2010 5:53 PM To: Mercedes Discussion List Subject: Re: [MBZ] Symptom - sinking brake pedal You can just put the Mityvac on the suction side of the booster, suck it down and see if it holds vac. If it doesn't then the diaphragm is bad. I replaced to MC on the TD, getting those line fittings back on the part was a nasty unpleasant job. They are pretty tight anyway with the lines being the way they are, and getting them lined up just right to get the fittings started can either take 10sec or 30min. While brake fluid is all over. Guess which they took... --R On 12/10/2010 5:48 PM, Max Dillon wrote: > Greg, tell me more about this test for the power assist unit. Have > Mity-vac! > > -Max > > -----Original Message----- > From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] > On Behalf Of Greg Fiorentino > Sent: Friday, December 10, 2010 5:06 PM > To: 'Mercedes Discussion List' > Subject: Re: [MBZ] Symptom - sinking brake pedal > > A failed vacuum pump can damage the power assist unit. This can be easily > tested with the Mity-Vac. > > Greg > > -----Original Message----- > From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] > On Behalf Of Max Dillon > Sent: Friday, December 10, 2010 1:00 PM > To: 'Mercedes Discussion List' > Subject: [MBZ] Symptom - sinking brake pedal > > OK folks, check my work here. After rebuilding the calipers on my '95 E300, > the service manual says to apply hard pressure to the brake pedal for a > short period of time, and then check for evidence of leaks. When I did this > test, no sign of any leakage, but the brake pedal slowly sank while I stood > on the pedal. I think the master cylinder is probably bad. > > > > This car also has a very soft brake pedal feel compared to my '87 wagon; > feels a lot more like the '72 Buick I used to drive in high school. I've > bled the system with my pressure bleeder, and now it has new rotors and new > Akebono ceramic pads at all four corners. All this work did little to > improve the pedal feel (had Pagid pads on it when I got the car). The car > stops just fine, but the pedal is too soft in my opinion. This car was > driven by the PO with a failed vacuum pump, so maybe something was damaged > by too much driving with no vacuum assist? > > > > > > Very respectfully, > /s/ > Max Dillon > Charleston SC > '87 300TD 332k miles > > '95 E300 277k miles > > '73 Balboa 20 > > > > > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
