opelrsx

Dealer replaced brake booster, but still making the rubber squeezing noise when press and release brake pedal. Not from the brake, from the brake pedal travel. Maybe simply somewhere need lubcation... any tips?

drwolf

how long ago did you come from the dealer?

opelrsx

Replacing brake booster didn't get rid of the noise at all. Still there when I pick it up right after they replaced brake booster. Then they say it's "normal". I don't want to wate time going back and forth with them. Something they cannot fix or don't care to track down they will claim it's normal. Just like my driver seat also made squeak noise when going over bumps. Mentioned to them while doing some other works, three times, no fix, then was told normal... I finally took a close look myself, found a bolt underneath slightly loose, 5 seconds to tight it up noise gone...

Anyways, I guess probably somewhere need lubrication so just reaching out to see if anyone has any tips where to look at.

opelrsx

Anyone?

opelrsx

Video link. Tried B'laster PB-50, WD-40 liquid grease... still making this noise

brake pedal noise

wyatt88

Some say dirty calipers can cause a brake pedal squeak. Not sure how that would be a cause, but found it on a google search of 'brake pedal squeak'. Good luck, I hate squeaks and rattles.

opelrsx

Very annoying... I tried to lubricate everthing around, cannot think of anything else. Only started after last service, which they did brake service. First complaint, dealer said they replaced brake booster, but noise still there, now they say it's normal... but no way that's normal.

fabbrisd1

What Year/Mileage GLS ?

If it under MB New Car Warranty - call MB Customer Care with a copy of that most recent service invoice.

PLEASE PLEASE don't spray 1970's lubricants in your MB... WD40/PB-Blaster/etc this isn't a rusty bolt on a '70's Muscle Car...

opelrsx

2019, still under warranty, they replaced brake booster once, now saying it's normal. I've sent the video to my SA, let's see if they will get back to me with anything new.

opelrsx

Shop foreman watched video, He admits it's not normal.... booked in, let's see what they can do this time.

opelrsx

Back from the shop, looks like they fixed it this time, nosie gone... brake master cylinder replaced.

iridium18

Good to hear of resolution.

zaidar61s!

hello there mate im having issues with my gle 2021 where the brake pedal makes a annoying squeaking sound

so you by any chance have a printout of what mercedes did so i can show it to the mercedes dealership as they havent even attempted to replace the booster yet

John CC

I have what I suspect is the same problem, but your sound file is not publicly available.

zaidar61s!

hi can you check my videos. Does yours sound like this?

https://www.dropbox.com/s/6g4p0a4j2n..._3881.MOV?dl=0

https://www.dropbox.com/s/i3gvo4v5e7...%2054.mov?dl=0

https://www.dropbox.com/s/9a90levwml...%2021.mov?dl=0

John CC

I think so. My wife is the one who drives it most of the time, so I'll have to go listen again to be sure.

opelrsx

I will post the paper when I find it. It was the brake master cylinder not brake booster. They replaced both (brake booster first but still making that noise). Replacing brake master cylinder fixed it.

zaidar61s!

thank you.. if you can attach the document it would really help

thanks again

opelrsx

Here you go

zaidar61s!

thank you very much mercedes have ordered the replacement booster and master cylinder thanks to this.

apparently there is a back order on master cylinders so hoping it arrives soon

zaidar61s!

hi how has your car been after master cylinder replacement? A month after my repair issue is back

opelrsx

Slowly coming back I think...