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#1
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brake pedal drop usual suspects
i have been driving the beast again for about a week. i started smelling something like tranny or brake fluid a couple days ago when pulling away from a stop light, maybe burning smell maybe not, smelled more like raw fluid. today on the way home my pedal suddenly went to the floor. I limped home pumping the pedal figuring a busted line. I parked and let it cool off. Then I popped the hood and still plenty of fluid, I started it and held the brakes as hard as I could, after a minute or two it would settle to the floor. I was pushing very hard. I inspected around the calipers and master cylinder and I cant find any fluid. Is there something Im missing? Is there a usual suspect? could it be leaking into the vacuum system or something? I know these dont pull the vacuum into the engine and burn it. waas up.......
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
#2
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Bad Master Cylinder
Classic bad master cylinder. It's no longer sealing to the bore internally and won't hold pressure, it may or may not be leaking. If it is leaking the fluid can be accumulating inside the power brake booster which will eventually make the booster fail. Get a replacement master cylinder, bench bleed it, and mop out as much fluid as you can from inside the booster.
I'm also in Lutz so if you want to get together and gawk at it shoot me a private message and let me know. |
#3
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I believe symptoms are indicative of a bad master cylinder.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#4
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all the symptoms except the smell of fluid are classic MC failure. it's possible that you are leaking small amounts of fluid around the oring of the plunger, and it's leaking down the bottom of the MC into the firewall of the car, and you are smelling that.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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Pull the two fasteners that hold the master cylinder to the booster and check for fluid in the booster.
Brake fluid will ruin a booster, so if you find some, flush it out asap! Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles |
#6
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ok, thanx guys is the master cylinder a autozone part or a mercedesShop part? recommendations? ATE or TRW?
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
#7
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Autozone is going to charge you $150.00 for a Beck Arnley master cylinder with a 3 month warranty and it needs to be special ordered. Discount Auto Parts will order you a new Cardone cylinder for $65 with a lifetime warranty. Or you could simply click on the 'Buy Parts' link at the top of the page and have one sent to you from someone who specializes in Mercedes parts. Personally I'm more than a bit wary of the quality of parts you get at chain stores but I've installed many Cardone rebuilt components over the years and have had very good success with their products. If someone wants to sell you a private label Supr-Delux Quality Rebuilt unit then run away.
Don't neglect bleeding _all_ of the old fluid out of the system when you do this in order to avoid problems in the future. |
#8
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i bought the TRW from mercedesshop. got pads to quiet the squealer on the front pass side while Im at it. hopefully the booster is not toast.....
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
#9
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if the booster is toast, Ill sell you one. I have a parts car. The brakes worked great on it, and when the engine is turned on the pedal sinks some (good booster).
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#10
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well new booster in place, vacuum bleed all around with Dot4 until clear. Today I was driving home in traffic and on about my 5th emergency stop (Tampa norm) and my pedal went away again only this time I got a huge puff of smoke too. I got off at the next exit and had to pump 3 or 4 times to get any pedal. I limped into a lot and popped the hood. My brake reservior was overflowing and fluid all around was causing the smoke. I wiped everything down and used towels to get the reservior back down to the max line. The fluid was really hot. Does this seem like maybe there is water in the fluid and it is boiling and causing steam in the line? I was able to drive home normally after about 15 minutes.
Whats the trick to getting a complete fluid change? I think that is what I must need. Everything seems to work just fine cold....
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
#11
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I believe you have a caliper that is dragging causing the fluid to boil. Jack up one corner at a time, apply the brakes and release, spin the wheel and you will find the one which it is. It also can be caused by the flex hoses so if they are older than 10 years change them too.
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Marty D. 2013 C300 4Matic 1984 BMW 733i 2013 Lincoln MKz |
#12
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Quote:
can the caliper be rebuilt? I am through puttin money in this thing. its costing me about $100/day to drive it. literally.....
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1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails) |
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