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#1
09-05-2009, 04:00 PM
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what if my master cylinder was never bench bled?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k 
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#2
09-05-2009, 04:07 PM
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Quote:
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 1993 190E 2.3 2001 SLK230 1971 LS5 (454) Corvette Convertible
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#3
09-05-2009, 06:17 PM
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alright, I bled the master, and all 4 calipers. starting with the master then the rears and etc...
Some air bubbles came out, maybe 3-5 per caliper, then i let it run for a but to see if any other bubbles came and nothing happened. I didnt feel any substantial change in the pedal. There is still a bit of pedal travel before actual braking occurs...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#4
09-05-2009, 06:37 PM
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Bleeding Brakes
CLEAN the top of the MC reservoir area, completely.
1. Get "New,Fresh,cheap,plastic turkey baster[tube with a bulb on the end]" 2. Remove master cylinder reservoir cap. 3.Remove the Filter Screen insert. 4.Evacuate all the Old Nasty BF you can with the "Turkey Baster" (you will not be able to remove fluid from the rear portion of the reservoir) 5.Refill the MC reservoir with fresh clean (UNOPENED container) BF. 6.Attach the Pressure Bleeder cap to the MC reservoir and pressurize to 15PSI. 7.Using bleeder nipples with the appropriate "Catch Container",BLEED the brakes. There are instructions in the search function on how to make a Pressure Brake Bleeder with a $9.95 garden sprayer from your favorite Big Box Store. All this "Pumping" or "Directing an Assistant" or using a Mighty Vac to bleed the brakes is 19th century...This can be a quick Solo 20 minute job every Spring or ....Masochism.
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'84 300SD sold 124.128
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#5
09-05-2009, 06:40 PM
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Brake Hoses
Jimmy,
How old are yours? Are they "Rubber" or Stain-Less Steel braid with a Teflon inner liner? When you step on the brake pedal with the engine running ,do the Brake Hoses "Bulge" visibly?
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'84 300SD sold 124.128
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#6
09-06-2009, 06:53 AM
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As mentioned it's best to use a pressure bleeder rather than pressing the brake pedal which can cause problems with the master cylinder since the piston goes beyond its normal travel. Bleeding sequence is RR, LR, RF, LF. Be sure the rear chamber of the master cylinder is filled with brake fluid so as not to introduce air into the system.
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Fred Hoelzle
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#7
09-07-2009, 10:46 PM
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MB spec is to flush/replace brake fluid every year on that car, so ya might as well start with that and see if it fixes the issue. It certainly wouldn't hurt to inspect all brake hoses since you will have to bleed yet again if you find a bad hose afterwards.
James Dean? I thought you were partial to Porsches......... 
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-tp 1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS 1988 560SEL "Gunther"- 190K passes anything except a gas station 1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition Last edited by tinypanzer; 09-07-2009 at 10:55 PM.
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