Squeaky brakes

masterboy123

Since winter has started the brake makes squeaky noise, especially when the car is cold.
Once I am on the motorway and apply break then it's fine without any noise.
Is it a sign to replace brake pads?

Car spec : Merc C class 2015

Cee-Jay-Cee

A constant squeal until the brake is pressed suggests a pad is sticking slightly and it may be simply because it’s a bit gunked up with brake dust.

Every year around this time I remove all the pads from my car, clean them with wire brush. Remove all the pad springs/shims and clean them and remove the caliper pins, clean and re-grease them and wind the pistons back in fully and pump them till they’re almost out fully and wind back in again. Takes 15 minutes per side but ensures no problems during winter.

Isambard

brake squeal is often caused by the pads vibrating and can be cured by a dab of copper grease on the back of the pad or by fitting anti squeal shims if they are there already.

zilog_jones

Copper grease could in theory promote galvanic corrosion or interfere with ABS sensors - there are many non-conductive brake greases available these days. It also should not be used on caliper guide pins as it's not a particularly good lubricant, and isn't suitable for contact with rubber boots.

masterboy123

Ok,
Is it an urgent issue that need to be looked after at dealership?
Like i said once the car is warm, there isn't any sound and brakes are working fine like before.

zilog_jones

Are they making noise only when you're applying the brakes? If it's just light squealing then probably not a big deal. Look at the discs for any heavy scoring or corrosion.

masterboy123

Yes, only when applying the breaks lightly. Once the car is warm enough then no noise whatsoever.
From external inspection, I don't see any signs of corrison.
It's interesting that noise goes away when the car is warm after driving say 5 km or so. Maybe some moisture?

zilog_jones wrote: »

Are they making noise only when you're applying the brakes? If it's just light squealing then probably not a big deal. Look at the discs for any heavy scoring or corrosion.

punisher5112

This is usually attributed to grit and dirt from roads, have a look at your discs they will tend to be covered in rust after car is parked up.

Its always the 1st few times brakes are applied that you get a squeak and or grinding sound.

Check pad dept and if worn bad replace.

Check if discs have a huge lip on inner or outer edge to where pads meet.