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  #1  
Old 02-13-2012, 01:43 PM
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Question 190D both rear brakes seized. What's wrong?

Went to work today with the 190D and car felt very sluggish 1/2 miles down the road and with a squeaking noise. Tried to turn round to head home but the car stopped in the middle of the road. It seized so bad just did not want to move and stalled the engine. Both rear rotors were hot to touch.

Walked home to take another car, grabbed some tools and hope to move it off to the curb. Jacked up both rear wheels and BOTH rear wheels would not turn. I squirted some water on the rotors/calipers to chill them down, started the car and it grudgingly moved to the side.

What is wrong? Master cylinder? It could not be calipers failing at the same time, could it?

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #2  
Old 02-13-2012, 02:05 PM
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I would guess Master Cylinder if both locked up on you. replace it and flush the system. If they got hot enough to lock up, then it can boil the fluid.

Do the pads or calipers smell burnt? If so, then the pads will need replacing, and maybe the calipers. all depends how warm things got.

Did your 190 get as hot as the 300D a few months ago? now those were pretty scortched. especially the R/R.

Charlie
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Anyone that thinks a 240D is slow drives too fast.

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  #3  
Old 02-13-2012, 02:09 PM
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I would replace your rubber brake lines as well. If they are old they can deteriorate and make a mess of the fluid and cause sticking calipers.
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  #4  
Old 02-13-2012, 02:11 PM
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Quote:
Originally Posted by colincoon View Post
I would replace your rubber brake lines as well. If they are old they can deteriorate and make a mess of the fluid and cause sticking calipers.
+10
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  #5  
Old 02-13-2012, 02:17 PM
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Originally Posted by charmalu View Post
I would guess Master Cylinder if both locked up on you. replace it and flush the system. If they got hot enough to lock up, then it can boil the fluid.

Do the pads or calipers smell burnt? If so, then the pads will need replacing, and maybe the calipers. all depends how warm things got.

Did your 190 get as hot as the 300D a few months ago? now those were pretty scortched. especially the R/R.

Charlie
Hi Charlie. I thought you would post. I am at work and the car is left in the neighborhood, thankfully next to the curb. I will try to get it back home tonight and take a look. I am leaning towards the master Cylinder and will give you a call. I will replace all the brake hoses also.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #6  
Old 02-13-2012, 08:58 PM
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If you cooled the rotors down with water you may have warped them so you may need new ones of those as well.
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  #7  
Old 02-13-2012, 10:12 PM
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how are the pads? Maybe they are both worn down too far and the pistons extended too far and got stuck? My mechanic just told me that could happen last week as he was recommending I get my front brakes replaced.
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  #8  
Old 02-13-2012, 11:07 PM
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From what I have read if your Mastercylinder is holding the pressure in the Brake lines when you loosen the Rear Brake Tubing Nut that connects to the Master Cylinder the Brake Fluid will spurt out a little.
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  #9  
Old 02-14-2012, 12:52 AM
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Originally Posted by Diesel911 View Post
From what I have read if your Mastercylinder is holding the pressure in the Brake lines when you loosen the Rear Brake Tubing Nut that connects to the Master Cylinder the Brake Fluid will spurt out a little.
This is exactly what happened when I loosen the bleeding nipple of the PR caliper. Brake fluid squirt out and then the wheel is loose, both side are loose in fact.

The brake pads are new-ish, all changed within the last year. The rotor and the caliper are OK visually. So it is the MC. Will report back when I change it.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #10  
Old 02-14-2012, 10:22 AM
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Your inner sleaves on the calipers are rusted up ,replace with new or rebuilt calipers ,your good to go .
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  #11  
Old 02-16-2012, 07:55 PM
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Originally Posted by ah-kay View Post
This is exactly what happened when I loosen the bleeding nipple of the PR caliper. Brake fluid squirt out and then the wheel is loose, both side are loose in fact.

The brake pads are new-ish, all changed within the last year. The rotor and the caliper are OK visually. So it is the MC. Will report back when I change it.
Unfortunately that only tells you there was pressure in the System. Pressure there could also be an indication the Rear Hose is shot and acting as a Valve and not allowing the pressure to be relieved; or, it could also be one of the ports in the Master Cylinder is plugged and holding pressure.

The other thing that can cause a pressure build up is Air in the system but it has been assumed that no Air got into the system.
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  #12  
Old 02-17-2012, 02:22 AM
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Quote:
Originally Posted by Diesel911 View Post
Unfortunately that only tells you there was pressure in the System. Pressure there could also be an indication the Rear Hose is shot and acting as a Valve and not allowing the pressure to be relieved; or, it could also be one of the ports in the Master Cylinder is plugged and holding pressure.

The other thing that can cause a pressure build up is Air in the system but it has been assumed that no Air got into the system.
It would not explain BOTH rear wheels locked up if the rear hose is shot. It has to be a single point of failure which controls both rear wheel - the master cylinder.

Changed out the MC and bled the system. All is well now.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
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  #13  
Old 02-17-2012, 02:35 AM
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Quote:
Originally Posted by chasinthesun View Post
Your inner sleaves on the calipers are rusted up ,replace with new or rebuilt calipers ,your good to go .
How you arrive at that?
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.
Reply With Quote
  #14  
Old 02-17-2012, 11:34 AM
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Happened to me but on a 300d ,the inside of the calipers do get rust after long use, you can rebuild the units but $65 will buy you new ones on each corner.
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  #15  
Old 02-17-2012, 10:09 PM
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Are you sure it isn't a malfunction of the parking brake?

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