Lesson learned - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 05-11-2018, 06:59 PM Thread Starter
Premium Member
 
Jyuma's Avatar
 
Date registered: May 2017
Vehicle: 1983 380 SL
Location: Long Island, New York USA
Posts: 2,158
Mentioned: 16 Post(s)
Quoted: 759 Post(s)
Premium Member
Garage
(Thread Starter)
Lesson learned

I've heard it said many times... new parts can be bad too.

Today I spent 3 or 4 hours bleeding my new brakes. Everything at the wheels is new or rebuilt, but I just couldn't get brake fluid to flow to the rear brakes. I figured the entire system was empty so maybe it would take a while for the fluid to get to the rear brakes... so I pumped and pumped and pumped but nothing. Long story short... one of the new self bleeders was bad. WHAT? Yup. The way I found it was by running up to Harbor Freight and buying a hand operate vacuum pump that can be used for many things requiring vacuum, including bleeding breaks. I put the gizmo on the right rear brake and pumped away on the handle but got nothing. I then moved to the left rear brake and managed to pull fluid from the master cylinder. I moved back to the right rear brake and again... nothing. I removed the bleeder entirely and fluid started dripping out of the caliper. I put the old non-self bleeder in, attached the pump and presto... fluid galore. The damn self bleeder wouldn't bleed. The other 3 worked ok but the 4th one nadda.

So it's true... new parts can be bad too. I wish I had thought of that 2 hours sooner.
cwmoser and yka like this.

Nobody gets out of this life alive.
Jyuma is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 05-11-2018, 10:01 PM
BenzWorld Elite
 
jsebastian's Avatar
 
Date registered: Sep 2011
Vehicle: 1967 250 S (sold) 1986 560 SEC 1987 560 SL
Location: San Diego, CA
Posts: 1,250
Mentioned: 3 Post(s)
Quoted: 129 Post(s)
Garage
Nice to hear that you got it sorted! There is nothing quite as annoying as new defective parts....
John
jsebastian is online now  
post #3 of 8 (permalink) Old 05-12-2018, 07:52 AM
BenzWorld Veteran
 
ejboyd5's Avatar
 
Date registered: Jun 2009
Vehicle: 1955 300 SL
Location: Southold, NY
Posts: 638
Mentioned: 1 Post(s)
Quoted: 175 Post(s)
I once encountered a bleed valve (brand new) that did not have the passage completely drilled. Very difficult to move fluid through a solid screw. Also had the same problem with a windshield washer nozzle.
ejboyd5 is offline  
Sponsored Links
Advertisement
 
post #4 of 8 (permalink) Old 05-12-2018, 01:14 PM Thread Starter
Premium Member
 
Jyuma's Avatar
 
Date registered: May 2017
Vehicle: 1983 380 SL
Location: Long Island, New York USA
Posts: 2,158
Mentioned: 16 Post(s)
Quoted: 759 Post(s)
Premium Member
Garage
(Thread Starter)
Quote:
Originally Posted by ejboyd5 View Post
Very difficult to move fluid through a solid screw.
Yup. Metal is a very poor conductor of fluid.

Nobody gets out of this life alive.
Jyuma is offline  
post #5 of 8 (permalink) Old 05-14-2018, 08:56 AM
Premium Member
 
Date registered: Sep 2017
Vehicle: 1985 380SL
Location: NY Capitol Region
Posts: 111
Mentioned: 0 Post(s)
Quoted: 50 Post(s)
Premium Member
I've been a bit leery of the speed bleeders as I don't trust the seal on the threads to be air tight and I don't like pushing the master cylinder piston into places it never goes. I went to a pressure bleeder and never looked back. These things are awesome and super easy to use. The one I got is at the link below but there are a number of sellers out their.


https://mercedessource.com/store/pressure-brake-bleeder
MrSpock is offline  
post #6 of 8 (permalink) Old 05-14-2018, 08:56 AM
Premium Member
 
Date registered: Sep 2017
Vehicle: 1985 380SL
Location: NY Capitol Region
Posts: 111
Mentioned: 0 Post(s)
Quoted: 50 Post(s)
Premium Member
I've been a bit leery of the speed bleeders as I don't trust the seal on the threads to be air tight and I don't like pushing the master cylinder piston into places it never goes. I went to a pressure bleeder and never looked back. These things are awesome and super easy to use. The one I got is at the link below but there are a number of sellers out their.


https://mercedessource.com/store/pressure-brake-bleeder
MrSpock is offline  
post #7 of 8 (permalink) Old 05-14-2018, 09:31 AM Thread Starter
Premium Member
 
Jyuma's Avatar
 
Date registered: May 2017
Vehicle: 1983 380 SL
Location: Long Island, New York USA
Posts: 2,158
Mentioned: 16 Post(s)
Quoted: 759 Post(s)
Premium Member
Garage
(Thread Starter)
Quote:
Originally Posted by MrSpock View Post
I've been a bit leery of the speed bleeders as I don't trust the seal on the threads to be air tight and I don't like pushing the master cylinder piston into places it never goes. I went to a pressure bleeder and never looked back. These things are awesome and super easy to use. The one I got is at the link below but there are a number of sellers out their.

https://mercedessource.com/store/pressure-brake-bleeder
I bought the cheap Harbor Freight hand operated vacuum pump for a few reasons...

1. It's cheap. I'll use it maybe 10 times in my life.
2. It does more than just bleed brakes. You can also troubleshoot vacuum problems with it.
3. Kent does a great job on his videos but damn... is there anything he doesn't market a kit for?
I'm waiting for the Mercedes Source kit for neutering your cat.
Currumbin SL likes this.

Nobody gets out of this life alive.
Jyuma is offline  
post #8 of 8 (permalink) Old 05-15-2018, 12:05 PM
BenzWorld Elite
 
Walt Williams's Avatar
 
Date registered: Dec 2015
Vehicle: 1983 380SL (us), Former owner: 1965 190Dc
Location: Near Zion National Park, Utah
Posts: 1,317
Mentioned: 2 Post(s)
Quoted: 440 Post(s)
Garage
Quote:
Originally Posted by MrSpock View Post
I've been a bit leery of the speed bleeders as I don't trust the seal on the threads to be air tight and I don't like pushing the master cylinder piston into places it never goes. I went to a pressure bleeder and never looked back. These things are awesome and super easy to use. The one I got is at the link below but there are a number of sellers out their.


https://mercedessource.com/store/pressure-brake-bleeder
If your going to do this how about getting and additional brake cylinder reservoir cap and fitting it with a schrader valve, turn your air compressor do to like 20#, and use that to bleed your brakes. That actually sounds like a slick idea.
Walt Williams is offline  
post #9 of 8 (permalink) Old 05-16-2018, 01:54 AM
Outstanding Contributor
Bob's Your Uncle!
 
nobby's Avatar
 
Date registered: Feb 2005
Vehicle: -----'83 280 SL----- 5 speed....The PIG
Location: Barrie, Ontario, CANADA, eh?
Posts: 29,027
Mentioned: 54 Post(s)
Quoted: 2411 Post(s)
Quote:
Originally Posted by Walt Williams View Post
If your going to do this how about getting and additional brake cylinder reservoir cap and fitting it with a schrader valve, turn your air compressor do to like 20#, and use that to bleed your brakes. That actually sounds like a slick idea.
Ala Nobby?

I use a 7 gallon pig with the regulator set at 15-20 psi.
Attached Images
 
nobby is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R/C107 SL/SLC Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome