Go Back  MBWorld.org Forums > Mercedes-Benz Sedans > E-Class (W124)
My brakes feel WEIRD! >

My brakes feel WEIRD!

Notices
E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

My brakes feel WEIRD!

 
Old 02-08-2007, 01:07 PM
  #1  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Exclamation My brakes feel WEIRD!

the strangest thing happened this morning (I assume brake master cylinder)

I got into the car and drove away to work as usual, but when I got to the stoplight my brake pedal went all the way down towards the floor almost making me hit the person already at the light!

now mind you, they have always been hard as a rock, so I always assumed that perhaps I was in need of a new master cylinder...I have no idea whats going on.

my car still stops, but it is really strange that all-of-a-sudden my brakes are buttery smooth and the pedal goes all the way down to the floor before the brakes kick in.

Any input guys?? I would appreciate it.
shadowgriffen is offline  
Old 02-08-2007, 01:21 PM
  #2  
MBWorld Fanatic!
 
shdoug's Avatar
 
Join Date: Dec 2006
Location: St. Croix, US Virgin Islands
Posts: 1,033
Likes: 0
Received 0 Likes on 0 Posts
1995 E320 SE, 162,000 Miles (Sold)
I agree with the master cylinder hypothesis. It's strange that it wouldn't do it every time, though. I assume the fluid level looks good?
shdoug is offline  
Old 02-08-2007, 01:27 PM
  #3  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by shdoug View Post
I agree with the master cylinder hypothesis. It's strange that it wouldn't do it every time, though. I assume the fluid level looks good?
I hear you...

Yes it's full

help!
shadowgriffen is offline  
Old 02-08-2007, 01:43 PM
  #4  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
I had that same thing happen to me when i first purchased the car.The pedal was really stiff.Then out of the blue it went down to the floor.It turned out to be two frozen rear calipers.I had the fluid flushed and the lines & calipers replaced and havent had a problem since.

Last edited by bjay51d; 02-08-2007 at 01:58 PM.
bjay51d is offline  
Old 02-08-2007, 01:45 PM
  #5  
Member
 
marco402's Avatar
 
Join Date: Nov 2006
Location: Houston,TX
Posts: 105
Received 0 Likes on 0 Posts
2001 W208A
sometimes a piece of rust (or such) in the mstr cyl plunger will leave a gap in one of the o-rings, allow fluid bypass...OR (scary thought) primary shuttle valve in ABS stuck momentarily.....mstr cyl rebuild is cheaper....but the fact that fluid is full rules out wheel caliper issue....have you done any recent work on the brakes, leaving an air pocket?
marco402 is offline  
Old 02-08-2007, 01:47 PM
  #6  
Member
 
marco402's Avatar
 
Join Date: Nov 2006
Location: Houston,TX
Posts: 105
Received 0 Likes on 0 Posts
2001 W208A
bjay51 has a good point, are you frozen (literally) up there?
marco402 is offline  
Old 02-08-2007, 01:56 PM
  #7  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
I wasnt talking literally frozen just rusted...Wow didntt even know that was possible.

Last edited by bjay51d; 02-08-2007 at 02:12 PM.
bjay51d is offline  
Old 02-08-2007, 02:01 PM
  #8  
Member
 
marco402's Avatar
 
Join Date: Nov 2006
Location: Houston,TX
Posts: 105
Received 0 Likes on 0 Posts
2001 W208A
Originally Posted by bjay51d View Post
I was talking literally frozen just rusted...Wow didntt even know that was possible.
he has been driving his car for awhile, so i imagine a frozen/rusty caliper would have shown itself earlier, but i see that the weather has been really cold, and upstate NY is under a mile of snow , but if it's below freezing and the brakes were wet last night, the first stop could be a long one
marco402 is offline  
Old 02-08-2007, 02:09 PM
  #9  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
Originally Posted by marco402 View Post
he has been driving his car for awhile, so i imagine a frozen/rusty caliper would have shown itself earlier, but i see that the weather has been really cold, and upstate NY is under a mile of snow , but if it's below freezing and the brakes were wet last night, the first stop could be a long one
He said they were always stiff.I drove my car for a while before the brake failed.I see your point it has been cold as ***** out this way.
bjay51d is offline  
Old 02-08-2007, 02:27 PM
  #10  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by marco402 View Post
but the fact that fluid is full rules out wheel caliper issue....have you done any recent work on the brakes, leaving an air pocket?
Mind you, my fluid was full last week, when I cheked it when I got to work it was halfway empty, I have not checked it today, will update.

Originally Posted by marco402 View Post
bjay51 has a good point, are you frozen (literally) up there?
Yes, we have had no day over 10 degrees Farenheight. windchill is at minus 15 F.

Originally Posted by bjay51d View Post
He said they were always stiff.I drove my car for a while before the brake failed.I see your point it has been cold as ***** out this way.
correct, my brakes have always been stiff, since I bought the car almost five years ago.

One thing: about two months ago, to anwser marco's original question, I replaced the rear brake pads. Two days before replacing them my brakes did the same thing they are doing now, but with a LOUD screech, really scary actually.

today my brakes continue to be buttery soft and just glide their way to the very end, where pedal meets the metal

very strange....and I dont want to put anyone in danger.
shadowgriffen is offline  
Old 02-08-2007, 02:30 PM
  #11  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
Originally Posted by shadowgriffen View Post
but with a LOUD screech, really scary actually. .
exactly what happened to me...I wouldnt drive it anymore...get to a shop.youre boiling your fluid.pretty soon it wont stop at all.

Last edited by bjay51d; 02-08-2007 at 02:34 PM.
bjay51d is offline  
Old 02-08-2007, 02:35 PM
  #12  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
ummmm...jay, I think you duplicated my post by accident.

check your PM inbox.
shadowgriffen is offline  
Old 02-08-2007, 02:44 PM
  #13  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
Originally Posted by shadowgriffen View Post
ummmm...jay, I think you duplicated my post by accident.

check your PM inbox.
I got alittle ahead of myself
bjay51d is offline  
Old 02-08-2007, 02:52 PM
  #14  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by bjay51d View Post
I got alittle ahead of myself
well my brake fluid is fine, so I'm not burning any brake fluid I just ran upstairs to the garage and checked, its all there.


this is driving me
shadowgriffen is offline  
Old 02-08-2007, 03:03 PM
  #15  
Super Member
 
bjay51d's Avatar
 
Join Date: Sep 2006
Location: New Jersey
Posts: 659
Likes: 0
Received 0 Likes on 0 Posts
1989300CE(sold),1996Accord,02CBR954
Originally Posted by shadowgriffen View Post
well my brake fluid is fine, so I'm not burning any brake fluid I just ran upstairs to the garage and checked, its all there.


this is driving me
Get your brakes checked asap.That loud screech was a warning.
bjay51d is offline  
Old 02-08-2007, 03:14 PM
  #16  
MBWorld Fanatic!
 
Join Date: Sep 2005
Location: Albuquerque
Posts: 5,317
Received 33 Likes on 32 Posts
'07 GL320CDI, '10 CL550
Over the years I've had two master cylinder failures, both easily associated with sudden cold weather. Shrinking rubber, I expect.
lkchris is offline  
Old 02-08-2007, 03:18 PM
  #17  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by bjay51d View Post
Get your brakes checked asap.That loud screech was a warning.
Negative my friend, you missunderstood my post.


I stated that the same buttery soft feeling has happened to me before, but LAST time that happened to me my brakes were making horrible squeeling noises, this time it's buttery soft sans screech.
shadowgriffen is offline  
Old 02-08-2007, 04:34 PM
  #18  
Member
 
marco402's Avatar
 
Join Date: Nov 2006
Location: Houston,TX
Posts: 105
Received 0 Likes on 0 Posts
2001 W208A
soft pedal that almost goes down to floor, no unusual noise, full of fluid, very cold weather......COLd (read HARD) o-rings in mastercyl, allowing fluid bypass, not dumping it, but letting it squeeze by....did you say once stopped, the pedal will hold the car at a stop?
marco402 is offline  
Old 02-09-2007, 10:05 AM
  #19  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by marco402 View Post
soft pedal that almost goes down to floor, no unusual noise, full of fluid, very cold weather......COLd (read HARD) o-rings in mastercyl, allowing fluid bypass, not dumping it, but letting it squeeze by....did you say once stopped, the pedal will hold the car at a stop?
Yes, that is correct.
shadowgriffen is offline  
Old 02-12-2007, 01:01 PM
  #20  
MBWorld Fanatic!
 
mgw_300e's Avatar
 
Join Date: Apr 2006
Location: Houston, Texas
Posts: 3,062
Likes: 0
Received 0 Likes on 0 Posts
Dora the Explorer
Did you ever get this figured out?
mgw_300e is offline  
Old 02-12-2007, 01:58 PM
  #21  
MBWorld Fanatic!
Thread Starter
 
shadowgriffen's Avatar
 
Join Date: Jul 2005
Location: Boston
Posts: 3,094
Likes: 0
Received 0 Likes on 0 Posts
is a German Tank
Originally Posted by mgw_300e View Post
Did you ever get this figured out?
Negative, but now that it;s not as cold as it's been lately the brakes feel about 85 percent normal

I'm 100% certain it's the master cylinder.
shadowgriffen is offline  
Old 06-09-2015, 04:36 PM
  #22  
Junior Member
 
Join Date: Mar 2015
Posts: 19
Received 0 Likes on 0 Posts
1990 W126 560SEL, 1995 W124 E420, 2000 W210 E320 wagon non 4 matic
My 1995 E420 is doing the exact same thing. I replaced Pads and bled system, am pretty sure the master cylinder is bad. I did also notice the ASR light comes on after a few minutes and the ABS pump quiets down at the same exact moment. I am going to replace master cylinder next and see if light goes out in conjunction with the replacing of Master cylinder.
rokacook is offline  
Old 06-15-2015, 01:24 PM
  #23  
Junior Member
 
Join Date: Mar 2015
Posts: 19
Received 0 Likes on 0 Posts
1990 W126 560SEL, 1995 W124 E420, 2000 W210 E320 wagon non 4 matic
Replaced Master cyckinder

Replaced Master cylinder , no preesuse at rear brake bled valve, I have brakes and ASR light is still on after ABS pump stops after 2 minutes or so the braking seems fine but noisy ABS pump and ASR light on I wonder if ASR pump is bad below master cylinder a little electric motor and pump one line to ABS system, Is there any good writting as to how this entire system works so that I could understand and troubleshoot?
rokacook is offline  
Old 02-23-2018, 09:28 AM
  #24  
Junior Member
 
Join Date: Mar 2015
Posts: 19
Received 0 Likes on 0 Posts
1990 W126 560SEL, 1995 W124 E420, 2000 W210 E320 wagon non 4 matic
As it turned out it was the rubber o ring that seats into reservoir was leaking. all better.
rokacook is offline  
 

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: My brakes feel WEIRD!


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: