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Old 06-01-2019, 10:40 PM   #1
Guy Smiley
 
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Default Squealing brakes

I took my 2018 4x4 in to the only MB certified shop in the state of MN (for Sprinters) for its 40K service.

I mentioned to the manager that my brakes are squeaking horribly.

He told me that MB doesnít use ceramic brakes on any of their vehicles because they feel that whatever the option they use is safer because the pads perform better. Even the C-class sedans tend to develop a good squeal.

At the time this seemed perfectly plausible to me, but now I canít help but wonder about it.

Does anyone around here have some insight about this?

Thanks!
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Old 06-01-2019, 11:35 PM   #2
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Default Re: Squealing brakes

If sand gets pressed into the pad it is like fingernails on a chalk board.
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Old 06-02-2019, 05:09 AM   #3
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Default Re: Squealing brakes

SOME disc brake noise is normal. The amount of noise that is considered acceptable for Commercial / fleet type vehicles is more than the amount of noise that would be considered for a normal passenger car.

Without hearing the noise, I can't tell you whether the amount of noise you're experiencing is abnormal or not. But I'm gonna take you at your word, that the noise IS excessive.

In general terms, and for most conditions, the best friction material to use is the friction material that is designed by the manufacturer of your vehicle- OEM Mercedes brake pads.

It is also important that they be installed correctly, lubricated correctly, with any brake pad hardware installed correctly and in good condition. Finally, it is important for the pads to be bedded in correctly, which usually requires a good surface on the brake rotors, or at least for the brake rotors to be cleaned of any old pad residue and deglazed.
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Old 06-02-2019, 05:52 AM   #4
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Default Re: Squealing brakes

I have a squealing front offside brake, I have inspected the rotor and pads, and they are pretty much new, I do plan on removing the pads, and cleaning them, and then adding some anti-squeal paste to the rear of the pads, as this is usually the area that creates the annoying sound.
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Old 06-02-2019, 05:56 PM   #5
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Default Re: Squealing brakes

Quote:
Originally Posted by The Grand Tour View Post
Without hearing the noise, I can't tell you whether the amount of noise you're experiencing is abnormal or not. But I'm gonna take you at your word, that the noise IS excessive.
I guess I was questioning what he said because I see Sprinters all over the place that don’t squeal at all when they brake at slow speeds (sub 10mph).

The brakes were just given their 40K service, so it should be safe to assume they are installed correctly.

This is the first and only commercial/fleet type vehicle I’ve ever driven so my word is pretty useless. I don’t have any point of reference to be sure it is excessive and I’m doubting now that it is, based on your post.

Last edited by Guy Smiley; 06-02-2019 at 07:32 PM.
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Old 06-02-2019, 07:08 PM   #6
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Default Re: Squealing brakes

Quote:
guess I was questioning what he said because I see Sprinters all over the place that don’t squeal at all when they brake at slow speeds (sub 10mph).
They will squeal. .. You can tune the squeal out. Next time you braking low speed and squeal, release the pedal pressure:quickly reapplying pedal pressure to tune off the squeal;repeat as needed.
I have used the technique since new; now @ almost 80,000 thousand on the pads to date.

Last edited by CJPJ; 06-02-2019 at 07:13 PM.
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Old 06-02-2019, 07:40 PM   #7
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Default Re: Squealing brakes

Over the years I have found when my van sits for a while, as in several weeks, oxidation builds up and causes some minor squealing. This has been eliminated after driving around and braking a few times to clean the oxidation or rust, off the rotor surfaces. It has always worked for me in Socal.

I imagine in more humid climates this could be even more of a problem when the van sits for a while. Thanks to all here.
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Old 06-02-2019, 07:45 PM   #8
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Default Re: Squealing brakes

Humidity IS a component of brake noise...

Last edited by The Grand Tour; 06-02-2019 at 07:48 PM.
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Old 06-03-2019, 01:35 AM   #9
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Default Re: Squealing brakes

Guy Smiley..
Virtually all MB/FL Sprinter OEM Brakes squeak and squeal at some point, unless they are used and used hard a
lot of the time.
As suggested, the best way to stop them from squealing is to make sure everything inside your van is lashed down
properly and then make a series of near lock up panic stops,
When you get into the range where it will stop the squealing, you may hear the ABS cycle a bit.
The ABS will keep your wheels from locking and flat spotting your tires, and the hard application
of the brakes will clean off both the bake pads and the rotors.
Try it.....can't hurt anything....and your brakes will stop squealing unless something else is
wrong.
Consider that the brake wear on OEM Sprinter brakes is 50% brake pad lining wear and 50%
wearing the cast iron brake rotors thinner.
You can see this by the difference in the rotor surface near the inside of the brake pads.
You will see a thicker kinda rusty area just inside the shiny surfaces worn by the brake
pad lining.
The rusty area is the original thickness of the rotor. The shiny area is how much below
the original thickness your brake rotors have worn.
This is why there is so much black "brake dust" on Sprinter front wheels. Half of the
dust is worn off brake pad lining and half is ground off cast iron worn off by the very hard
pads that tend to squeal.
Roger
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2014 Sprinter 516 series (3500 DRW) 170"/4325 mm wb Hi Top Short Back
OM-651 I4 2.143 liter two stage turbo charged with 36.9 PSIA MAP Limit Valve
7 Speed 7G-Tronic, manually shiftable, automatic transmission.
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OEM back up camera, Bi Xenon light package, fog lamps, headlight washers.
Had 2006 T1N 3500/158|2010 NCV3 519/3500/144|2011 & 2012 NCV3 519/3500 170

Last edited by sailquik; 06-03-2019 at 01:44 AM.
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Old 06-03-2019, 02:20 AM   #10
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Default Re: Squealing brakes

Trying to master the first a few notes to the Star-Spangled Banner. As I slowly roll to a stop, I can control the squealing into one drawn-out obnoxious squeal like fingernails on a chalk board.

I have not used this stuff on a Mercedes-Benz. I have on many other vehicles and never experienced any squealing. Use sparingly.

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