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#1
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Intermittent 124 Brake Failure?
Anyone familiar with a condition where, occasionally, you step on the pedal and it is hard (no travel) and no braking action. When you release the pressure and try again the system functions properly.
This only occurs from time to time. Lites function on the cluster. Comments? |
#2
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I have noticed similar with my 1990 300d.
I noticed when washing the car that one rear disc has not been doing any work,the caliper has seized. Odd pedal feel and abs kicking in at around 2mph as I come to a stop. |
#3
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issue with the brake servo or vacuum to the servo?
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________________ punkinfair |
#4
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Quote:
Has your 124 been hanging out with the new Prii, (whatever the plural of Prius is)?
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous “Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss |
#5
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What? Did MB sun-contract out their brakes to Toyota?
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags |
#6
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300Dt brake funcion
No idea of the cause. Basic hydraulic functions are pretty reliable. I think it may have to do with the ABS system. It's a bit difficult because my son has the car although I have experienced the problem. It doesn't happen very often and lasts for only a few seconds.
I have access to two retired MB guys so when I get it figured out I'll post it. |
#7
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My first sensible response has been 1) clean all the abs sensors on the wheels and purge the air out of the system. This might well clear things up. Still waiting to be able to talk to main mb guys. Let you all know. Thanks. Oh, Prii might in fact be correct.
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#8
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Hey! When you find out what the problem is with your brakes, you may want to let the guys at Toyota know. They have been having vaguely similar problems with their hybrid!! Has you MB friend just got a job at Toyota?? HAHAHAHA !!!
Seriously it does sound like you have an ABS problem as you have a firm peddle. My second suggestion would be a vac problem, low vac will make it feel like you need a 10 ton foot to slow the car. I hope you are not trying to drive it at the moment!!
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#9
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You don't say whether the car is gas or diesel - it makes a difference.
If it's a petrol powered vehicle, I would replace the brake booster and be done with it. 99.999% chance this is the problem. Look for brake fluid in the booster; if present you need a master cylinder too. If there's no pulsing in the pedal, you don't have an ABS problem. If the car is diesel powered, then it could be either the booster or vacuum pump. Still, I'd start with the booster. Since it's a 124, how old are the flexibile brake lines? If much past 10 years, then it's time to consider changing them as well. |
#10
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This is happening on my W124 also.
I replaced the brake booster line thinking I was having a problem with my "Non Return Valve", because when the brakes have no vacuum assist the engine will not turn off either. As you know, the engine shut off gets it vacuum from the brake booster line, and the "Non Return Valve" is supposed to keep a vacuum for the brakes and the engine shut off even when the engine is off. My thought was the valve was getting stuck in a closed position not allowing "fresh" vacuum into the brake booster and the shut off actuator. The new booster line did not correct the problem, much to my surprise. My vacuum pump makes a little noise, and since it is 17 years old with 150,000 miles I will replace it next as a preventative measure. If after the new pump I still have the stiff brake problem, I suppose it can only be the brake booster itself. That would be surprising because it holds vacuum all night, has no brake fluid in it, and works perfectly after the first cold startup period every day. But MB diesels are full of surprises, aren't they?
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png |
#11
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Quote:
That said, full disclosure of year/model is seldom a bad thing. |
#12
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Clean the ABS sensors on the front axle.
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600SEL '91 300E 4Matic '88 240D '83 280SE '77 350SE '73 The most complex systems can fail in the simplest way. Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis. i don't believe in the lord! He's never bought me a Mercedes Benz. |
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