screeching sound from the front while braking to a stop....

[1mill]

Hello

Today, it's around 27 degrees in London... I took out my Lambo for a spin and i can hear screeching sound from the front of the car only when i hit the brakes.

I tried coming to a stop without using the brake pedal and i don't think I heard anything... i am guessing it's the brake pads? I haven't even taken the car out since the last service in jJn 2020 (last service by Lamborghini). so if the brake pads were worn, they would have advised...

Ive checked behind the wheels and nothing loose, etc.... nothing falling etc...

Happened to anyone? any clues of what this can be?

Thanks

[PompeyReece]

Sounds like pads to me, especially as it only happens when they're in use.

RE: your comment on brake pad advistory - you are assuming the service engineer was competant and doing their job correctly which isn't always the case.

[cgt2]

Ceramics or steels?

[1mill]

steel...

[anonymous-user]

Is it a high pitched squeal or a grinding sound? Brake squeal could be due to a stuck caliper piston resulting in uneven pressure applied to the pad when braking which in turn can cause harmonic squeal. Quite possible if it hasn't been used since January and a few taps to the calliper with a wooden block and cloth between it and the caliper could sort it. If it's a grinding sound the yes, either pads are down to the wear indicator or something (pebble) may have been trapped in there. Try reversing and applying the brake gently.

EDIT: Just saw steels - could be rust buildup - needs an Italian tuneup. Although confirm not the above before trying that

[1mill]

no squeal... slight grind sound....


well now that you have mentioned pebble ... i drove to a near town and they were resurfacing the roads with tarmac etc.... whilst driving down that road, i could hear a lot of stones hitting up against the bottom of my car while i was driving.....


see pics of my brake pads...

[1mill]

also, is this bit of the calliper suppose to be so near to the disc?

[topjay]

Try reversing for a bit it usually gets out anything stuck in it if that is the problem.

[anonymous-user]

Pads look fine - plenty life in them and the caliper gap is normal. One of the pictures shows a brown discolouration on the pad - looks like a bit of rust. That can form an oxidation surface between pad and rotor that can cause squeal - maybe find an empty road and do a few 60-20 hard braking iterations.

Any debris caught in there will most likely be in the inside pad as they bounce around the wheel well before being thrown in there.

[1mill]

cool thanks, will try... what is 60 20 brake iterations? braking at 60 mph? s

[1mill]

thecook101 said:

Is it a high pitched squeal or a grinding sound? Brake squeal could be due to a stuck caliper piston resulting in uneven pressure applied to the pad when braking which in turn can cause harmonic squeal. Quite possible if it hasn't been used since January and a few taps to the calliper with a wooden block and cloth between it and the caliper could sort it. If it's a grinding sound the yes, either pads are down to the wear indicator or something (pebble) may have been trapped in there. Try reversing and applying the brake gently.

EDIT: Just saw steels - could be rust buildup - needs an Italian tuneup. Although confirm not the above before trying that

i dont think its rust... my garage is dusty lol.... the disc had dust on them.... i should have washed my car... i didnt realize until i parked up at my destination.

[anonymous-user]

1mill said:

cool thanks, will try... what is 60 20 brake iterations? braking at 60 mph? s

Yup, hard braking from 60 down to 20. Faster is better but that’s illegal ;-) and you don’t want to stop rotation altogether hence 20.

Edited by anonymous-user on Wednesday 20th May 23:22

[1mill]

Update...

In the morning i decides to check the back grinding plate with my hands.... i tap the backplate a couple of times and these fell out! tarmac stones, gravel ....

i have yet taken the car out but im sure this is it.

[PompeyReece]

Great stuff, hpoefully that's the end of it.

Thanks for keeping us updated.

[anonymous-user]

Nice one - pretty sure that will be it. I get this on my 911 regularly.

[BigR]

I have a Huracan and experienced it a bit (ceramics), but the cure was hard braking. Lambo service said you have to use the brakes pretty hard, so that's what I did and it cured it. I have, however, had stones stuck like you appear to on my Maserati in the past - once I gave it a tap here and there and looked on the ground to find exactly the same bits of tarmac, the problem disappeared. I think when they do surface dressing on roads it doesn't exactly help matters at all, regardless of car.

[BlackR8]

Guys on the same sort of topic, what causes brakes to only squeal when coming to a total stop and only occurs once the brakes are warm? (i.e. when driving from cold then there is no squeal)