Team-BHP - Grinding noise from the brakes

Quote:

Originally Posted by R2D2 (Post 4439815)

In your friends case, the owner could drive the car himself and bed the brakes in. Unless of course he doesn't drive at all.

You just hit the nail on the head. :D He has not been in the driver's seat for a long time, and couldn't care about such mundane things as driving - that's the chauffeur's job, and he's paid well for it!

Quote:

Originally Posted by SS-Traveller (Post 4439875)

No worries! There's something called 'backseat driving" which many of us experience with our spouses. :D

Either the owner (OR even yourself as you've expended a lot of effort in resolving the problem) could just sit comfortably in the back/front seat and give the driver directions on what to do when a new friction set is installed.

Drivers are generally very clued into vehicles they drive and he would probably be quite appreciative of this process. Heck, it's not every day that you bed in a MB's or any other car's braking system.

Quote:

Originally Posted by SS-Traveller (Post 4438283)

Now what? Any suggestions welcome.

An often overlooked and usually root cause for brake noise problems are the Caliper Guide Pins. If the vehicle is new, odds are it's not lubricated well, and if old, pins are corroded. Or a combination of the two.

Dunno if you have checked already, but it is easy to inspect and be sure to lubricate with some good quality high temp grease.

Cheers

2. Use an anti-squeal paste to damp the low-pitch vibrations from the pads & calipers. I narrowed down to a Liqui Moly product available on Amazon. Since this is an entirely reversible process as well as easier to procure the product, I thought I'd give this a try first.

Read this again today and suggest you do the following step-wise:
1) clean the entire braking system, including calipers, with an appropriate cleaner/solvent and reassemble. Do not apply cleaner again after this.
2) Coat the caliper pins with high temperature lithium grease only before reinserting
3) Tighten the bracket bolts using a torque wrench only. But for this you will have to find out the torque value to which the bolts are to be tightened. ----> this is critical

All the best :thumbs up

My Polo GTI too makes this noise. It's present only at very slow parking speeds and has been there from day one. Not only noise while braking at slow speeds, my car creaks even when the hand brake or regular brakes are engaged and someone gets in and out of the car! The culprit in my car is clear the rear discs. When brakes are not engaged there is no sound when one gets in or out.

I got the car serviced recently and reported this issue. The noise was gone for one day and now it's back. I guess I will have to just live with it. :Frustrati

Quote:

Originally Posted by KaranP (Post 4441223)

My Honda City automatic makes the same sound !! Clearly not limited to luxo barges!

Quote:

Originally Posted by meetgds (Post 4445283)

Have you found a solution yet? My Verna AT makes a similar sound too and I've not found out why yet!

Quote:

Originally Posted by Santoshbhat (Post 4445312)

My Polo GTI too makes this noise. :Frustrati

This is a common malaise of cost engineered vehicles, including the OP's friends car. The brakes are usually slightly undersized for the task. Not that they will be insufficient, but will suffer from higher than normal temperature related issues.

Next time you take the car for service, either replace the caliper guide pins if not too expensive, else have them specifically open and lubricate the pins as they are rarely serviced. I can assure you there will be a difference.

Cheers.

Hello everyone

First of all, a big thank you to the moderators for accepting my membership. Team BHP has been my go-to platform for any car related news or advices. I used to binge-read all the ownership reviews at one point. So once again, thank you so much for accepting my membership. Also, i hope everyone is sound and safe.

I own a Maruti Dzire ZDI AGS. I purchased the car on March 12th (yes, i remember the date precisely because i purchased it from my own fundslol:), The car has clocked roughly around 42,400 kms till date. Before this lockdown, my daily travel commute to office was 35 kms one way (Kharghar-Powai). But once the lockdown started, my commute has reduced drastically and it is expected to remain the same atleast till December 2020.

At the start of lockdown, i used to park my car with handbrake engaged for long duration of time. Nowadays, I park my car in Manual mode without engaging the handbrake (if i park my car for more than 3-4 days).

Now, i feel my Tyres has started to worn out. Though there is still some depth left, i feel the road noise coming from Tyre has increased. Also, on braking in uneven surfaces, i hear the noise more than before. Although, when i brake on smooth roads, there is no sound from the tyres or the brakes. When i went for my last servicing around, 37600 kms they said that the brakes are completely fine.

My car is still on Stock Bridgestone Ecopia Tyres and stock brake pads.

Thus, i'm a bit confused whether the sound is coming from the brakes or the tyres are starting to wear out. Also, why is it that the sound is more apparent when i brake on uneven surfaces and there is no noise when i brake of smooth surfaces. Any advice on this issue will be hugely appreciated. Thank you in advance.

P.S. please feel free to move my post to any other relevant place.

My friend's new - March 2021 purchased Mercedes C200 which has <1000 kms on the odo has this groaning, grating/grinding sound when coming to a standstill, and again while starting from a halt. This is especially noticeable when using brakes to hold the car while shifting from D to R and, then back to D at parking speeds.

Our initial assumption was some transmission noise. Some googling diagnoses this as brake noise. The dealership has dismissed it as an absolutely normal phenomenon and replicated the same in a C class and an E class at the showroom. My friend is trying to check with friends and acquaintances who own similar vehicles, for feedback - and push for some solution once the car goes in for it's first service which is due soon.

Exact same issue in my 2018 C200, i’m not sure after how many kms in popped up but it’s extremely annoying.

Upon getting it checked at the service centre, the service advisor checked brake pad life remaining which was plenty and assured that this is a common issue, which i can see from this thread.

This issue combined with a not so smooth transmission (another common issue according to google) makes me question the point of buying a german car.

My 5th Generation Honda City is way smoother and comfortable to drive than the C200 and remains by go to choice always

Quote:

Originally Posted by redindian (Post 4439640)

I have had similar experience on my C220 for the last 18 months. I followed up with multiple service center visits and even an escalation to Mercedes India. Merc India promptly sent their technical expert to help , but the problem still persisted even though we changed pads.

In the C220d ( which is diesel vehicle with higher torque than c200 ), this problem manifests additionally as a frustrating groaning noise when the brakes are not warmed up enough and you come to full stop / near stop. The grinding noise also happens when you slip the brakes at crawl speeds.

I believe this is probably due to the brake pads being not "soft" enough when cold, and the excessive use of aluminium parts , which probably resonate due to the brake shoe vibrations. Problem disappears once brakes warm up , alternatively if I had a spirited drive the previous day ( e.g. high way run with a lot of braking) , the problem is non existent ( probably because of a fresh layer of brake pad getting deposited on the discs)

No solutions yet, but some things on my list of To-Dos include trying out softer pads ( at the risk of sacrificing brake pad life) or trying out more expensive ceramic pads from other brands like brembo - will probably try this out in a few months when i get some spare time to follow this up.

I'm experiencing the exact same thing with my 2015 c220d. The brakes make an awful groaning noise when halting or braking at crawl speed, but the issue disappears once the breaks heat up after driving around for a while. I got all four brake disks and pads replaced, but the issue persists.

At first I thought there's something wrong with my car, but after reading this thread it looks like this is a common issue in Mercedes cars from this generation.

Did you ever find a permanent solution? Cheers