Mercedes

Have Mercedes questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

1983 Mercedes 380 SL. Has been sitting for a couple of

years. No brakes at all...
1983 Mercedes 380 SL. Has been sitting for a couple of years. No brakes at all. I replaced master cylinder. Went to bleed brakes and after pumping brakes like forever no fluid came out of line at right rear brake. Took an air hose and blew into one of the main lines I took off at the master cylinder. Fluid came out OK. What could be wrong? Master cylinder? Booster?
Show More
Show Less
Ask Your Own Mercedes Question
Answered in 10 minutes by:
11/22/2016
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,216
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified

Hi Ray, it's not unusual for you to not get the back part of the master cylinder reservoir filled with fluid. Double check the fluid level first. Fill the reservoir all the way to the brim and then open the rear bleeder and see fluid eventually drips from the bleeder. It may take awhile before it starts dripping. If you don't get any fluid try loosening the master cylinder at the booster and pull it away from the booster then see if it starts dripping. Let me know what happens.

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
OK, the reservoir was full, we did get a drip, but that was it and that took forever. Wore my leg out pumping...The fluid would want to drip but for each pump it would get sucked backwards into the line. What exactly forces the fluid into the line? Is there a rod or something in the booster that creates the vacuum into the line? Just wondering....Reason why I ask because the pedal goes all the way to the floor as if there is no resistance at all.

When you let go of the pedal the master cylinder will suck in air if you leave the bleeder open. Only open one bleeder at a time. Start at the right rear. Connect a rubber hose to the bleeder and route it into a clear bottle of brake fluid. Keep the end of the hose submerged in the fluid while a helper slowly pumps the brake pedal. Pump until no more air bubbles come from the hose then have your helper hold the pedal to the floor while you close the bleeder. Repeat the procedure at the other 3 wheels. left rear, right front, left front.

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
We did all of that. We've done this plenty of times but it was this one that is giving us issues. I have an '88 IROC we did before jumping to the Mercedes. Only difference is that I replaced the booster on it. Being 28 years old, I wanted to insure the entire braking system was in perfect working order. We did all of what you said, it just would not drain but only barely dripped...barely. Like I said, I pumped the brake pedal until I was tired of pumping with 0 results.

Do you get fluid from all of the other bleeders?

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
No, we stopped after we did not get any from the right rear and after I had to use air to get any flow at all. Knew that wasn't a good sign. Wanted to find out what the problem could be. I figured if we didn't get anything from the far point, we wouldn't get anything from the rest. The reservoir remained full the whole time we tried the first bleed. Pedal went to the floor while pumping. 0 resistance.

Try going right to the master cylinder and open the lines and see if you get fluid from the master when you push the pedal down. If you don't get fluid try loosening the master from the booster so there is about 1/4" clearance between the master and the booster and try it again.

Ask Your Own Mercedes Question

If the rod in the booster is not letting the cylinder come all the way back it won't draw any fluid from the reservoir.

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
Is there an adjustment for this rod?

Not really, sometimes you can screw it in but it is usually a fixed rod. If loosening the master allows fluid to flow to the calipers I suspect that you may have the wrong master cylinder installed.

Ask Your Own Mercedes Question
Customer reply replied 1 year ago
I can't get to work on it until this weekend. In the meantime, have a great Thanksgiving and I will let you know what happens on Monday.

Sounds good Ray. Have a Happy Thanksgiving.

Ask Your Own Mercedes Question

Hi Ray, are you getting this reply?

Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,216
Experience: Bosch Certified Master Tech. Over 35 years experience.
Verified
Marty and 87 other Mercedes Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mercedes mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Marty Your Own Question
Marty
Marty
Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 55,216
55,216 Satisfied Customers
Experience: Bosch Certified Master Tech. Over 35 years experience.

Marty is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

< Previous | Next >

Meet the Experts:

MB Paul

MB Paul

Mercedes Technician

3,567 satisfied customers

Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes

Marty

Marty

Mercedes Technician

55,216 satisfied customers

Bosch Certified Master Tech. Over 35 years experience.

Lou P. master tech

Lou P. master tech

Mercedes Technician

4,460 satisfied customers

20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.

Michael Warfield

Michael Warfield

Factory Mercedes-Benz Technician

3,132 satisfied customers

Mercedes-Benz Master Certified technician

Matt

Matt

Engineer

643 satisfied customers

Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing

promerc

promerc

mercedes diagnostic technician

553 satisfied customers

Qualified mercedes diagnostic technician & service team manager , ATA registered Master tech

Hipo64

Hipo64

Mercedes Technician

444 satisfied customers

Work and diagnose electronics on daily basis.

< Previous | Next >

Related Mercedes Questions
Was bleeding brakes on my '86 190 2.3-16 and misread fluid
Was bleeding brakes on my '86 190 2.3-16 and misread fluid level in reservoir...allowing air into the ABS control valve block. I'm now getting constant air bubbles out at the calipers and the reservoi… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1983 Mercedes 380 SL. I have replaced the brake booster and
1983 Mercedes 380 SL. I have replaced the brake booster and the master cylinder. The shaft on the booster currently will not reach the bottom of the master cylinder when the pedal is pushed all the wa… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
AIR IN BRAKE LINE - My brakes were operating perfectly, but
AIR IN BRAKE LINE - My brakes were operating perfectly, but the pads needed to be replaced. I like to do things 100% the first time. So, I ordered high quality rotors and seals. I ordered only for the… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
s430: I got a 2001 s430 mercedes the brake pedal is soft goes
I got a 2001 s430 mercedes the brake pedal is soft goes to floor first we wasnt getting any brake fluid to rear then we change booster and master cylinder bleed the brakes got fluid to rear brakes sti… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
mercedes 300 sd 126 body diesel: i have a 1981 mercedes 300
i have a 1981 mercedes 300 sd 4dr 126 body. daily driver. 4 days ago the brake pedal got gushy-mushy, then in a couple of blocks went almost to floorboard, could pump it back up half the time, but ped… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1984 Mercedes: brake pads..reservoir..that goes on the shaft
I have a 1984 Mercedes 500 SL I have replaced all the calipers brake pads Master cylinder and brake fluid reservoir brake booster and booster vacuum hose. My problem is that the brakes lock up when I … read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
Mercedes: SL..accelerator..fuel pump,filter,spark plugs..fuel tank
After My Mercedes 1983 380 SL starts it will ideal roughly and as soon as the tyranny is engaged it dies. If I do not step on the accelerator it will creep along until i just touch it and it will die.… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1989 Mercedes: Leaking left rear wheel caliper..pedal..bleeder
Please direct this to Eurotech. 1989 Mercedes 560 SL. Leaking left rear wheel caliper, replaced. I went to bleed the system, via gravity, and also via std method of pushing the pedal while manipulatin… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
boxster: 98 SL 500 that I asked..diagram..brake booster..4 wheels
I have 98 SL 500 that I asked about a few weeks ago, concerning replacing the brake boster. I have the diagram and it mentions that I will have to bleed the system. Since I will only remove the brake … read more
Auto Psychic
Auto Psychic
owner
Bachelor's Degree
1,364 satisfied customers
1989 mercedes 420sel: the brakes we get fluid out of front lines
1989 mercedes 420sel - when bleeding the brakes we get fluid out of front lines but none out of back. Any help you can give?… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1984 mercedes 500sl: brake fluid..bled..brakes,replaced the master cyl
i have a 1984 mercedes 500sl that had a brake fluid leak on two lines. I replaced those lines,then bled the brakes,replaced the master cyl. and brake booster. I still have sponge brake.I have bled the… read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
1983 300sd: rebuilt..brake pedal when trying to bleed i..bled
i rebuilt the clipers now when i installed and conected brakelines and etc i get no pressure on brake pedal when trying to bleed i also bench bled the m/c and replaced it what is the problem with the … read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1992 Mercedes 500sl: air in front brake line-like to bleed brake-what
1992 Mercedes 500sl - air in front brake line-like to bleed brake-what adjustments-step by step directions.… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
A 560 sl that we cannot bleed the brakes on no fluid coming out at all
I have a 560 sl that we cannot bleed the brakes on no fluid coming out at all. Master bench blead just fine but nothing at the wheels… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
88 300SE: I replaced the rear calipers...left rear bled..right rear
I have an 88 300SE with 4 wheel ABS. I replaced the rear calipers. The left rear bled fine but I cant get the air out of the right rear.… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1986 300 E, I just replaced the rear brake pads rotors & lines..tubing
I have a 1986 300 E, I just replaced the rear brake pads rotors & lines ever since then I have not been able to bleed the system. I have tried everthing. even a piece of tubing atached to the bleed va… read more
Marty
Marty
Mercedes Technician
55,216 satisfied customers
1983 Mercedes-Benz 240D: My mechanic..clutch..I found leaks..hose
75 Mercedes 240 D Optional Information: Pre-1983 Mercedes-Benz 240D 4cyl Already Tried: My mechanic is trying to fix my car-the clutch stopped working went to floor-I found leaks under car- I supplied… read more
Mike
Mike
Proprieter / Diagnostic Technician
High School or GED
87 300d: replaced rear..calipers..the master cylinder..pumping
87 300d replaced rear calipers and can''t get the master cylinder to stop pumping air when bleading.… read more
RIP
RIP
Lead Technician/ JA Car Category Mentor
High School or GED
452 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x