brakes squeal when cold
07-16-21, 05:25 PM
#1
Driver
Thread Starter
brakes squeal when cold
08 gs350. everyday i leave for work and the 1st few stops my brakes squeal. But after that i guess they warmed up and dont squeal anymore. its kinda annoying as i park in a parking garage and its really loud. after the 1st stop sign the squeal is gone.
07-17-21, 05:18 AM
#2
Usually this happens in the early morning's first drive, which is caused by the moisture build up overnight,
and the moisture sort of gets dried/wiped off when you drive and use the brake.
If you look through the rims, you may be able to see moisture build up.
Sometimes I even see little bit of surface rust marks as well.
For my son-in-law's 2009 Camry, this (loud screeching noise) only happens when he's reversing the car out of the garage in the morning.
When he parks backwards, and starts the drive going forward (no reverse), then the noise doesn't happen.
His new brake job was less than 6 months old, so it ain't brake going out.
Does this happen on reverse only in the morning?
Try to drive the car in mid day once temp has warmed up and see if noise doesn't happen.
Also, if it's making loud short clicking noise when you brake,
then the metal brackets that are shifting and will need greasing.
If it's long squeal for the duration of the braking,
then there is outside chance that, your rotor and/or pad may be unevenly worn out.
Look for scratch marks on rotor that you can feel with your fingers.
Also look for brake pad (on both sides of the rotor) thickness not being even.
and the moisture sort of gets dried/wiped off when you drive and use the brake.
If you look through the rims, you may be able to see moisture build up.
Sometimes I even see little bit of surface rust marks as well.
For my son-in-law's 2009 Camry, this (loud screeching noise) only happens when he's reversing the car out of the garage in the morning.
When he parks backwards, and starts the drive going forward (no reverse), then the noise doesn't happen.
His new brake job was less than 6 months old, so it ain't brake going out.
Does this happen on reverse only in the morning?
Try to drive the car in mid day once temp has warmed up and see if noise doesn't happen.
Also, if it's making loud short clicking noise when you brake,
then the metal brackets that are shifting and will need greasing.
If it's long squeal for the duration of the braking,
then there is outside chance that, your rotor and/or pad may be unevenly worn out.
Look for scratch marks on rotor that you can feel with your fingers.
Also look for brake pad (on both sides of the rotor) thickness not being even.
07-17-21, 02:00 PM
#3
If your brake pads are not toast then more likely its a buildup of dried debri/seized and not enough lube in the brake calipers. Common problem on our cars. Mine was super bad, even though my pads and rotors had a lot of life in them.
If the pads are good and the same for the rotors, this is what I did. instead of slapping parts and money, I simply removed all 4 calipers. Sanded the rotors by hand just to knock off the glazing on both sides. My pads were good but the contact surface was glazed so I grabbed an angle grinder with a sanding disc, and lightly sanded (while wearing a mask) the glaze off. The center pin, silencer scuff with fine sand paper to remove any rough surfaces. Fully clean inside the calipers and all around with brake cleaner.
Use a lot of grease, behind the pad, inside the caliper, the silencers, the rear caliper sliding pins, the floating pins etc. Anything that moves, give it a good amount of grease. This method worked for me for many years of silent braking.
If the pads are good and the same for the rotors, this is what I did. instead of slapping parts and money, I simply removed all 4 calipers. Sanded the rotors by hand just to knock off the glazing on both sides. My pads were good but the contact surface was glazed so I grabbed an angle grinder with a sanding disc, and lightly sanded (while wearing a mask) the glaze off. The center pin, silencer scuff with fine sand paper to remove any rough surfaces. Fully clean inside the calipers and all around with brake cleaner.
Use a lot of grease, behind the pad, inside the caliper, the silencers, the rear caliper sliding pins, the floating pins etc. Anything that moves, give it a good amount of grease. This method worked for me for many years of silent braking.
07-17-21, 10:29 PM
#4
If your brake pads are not toast then more likely its a buildup of dried debri/seized and not enough lube in the brake calipers. Common problem on our cars. Mine was super bad, even though my pads and rotors had a lot of life in them.
If the pads are good and the same for the rotors, this is what I did. instead of slapping parts and money, I simply removed all 4 calipers. Sanded the rotors by hand just to knock off the glazing on both sides. My pads were good but the contact surface was glazed so I grabbed an angle grinder with a sanding disc, and lightly sanded (while wearing a mask) the glaze off. The center pin, silencer scuff with fine sand paper to remove any rough surfaces. Fully clean inside the calipers and all around with brake cleaner.
Use a lot of grease, behind the pad, inside the caliper, the silencers, the rear caliper sliding pins, the floating pins etc. Anything that moves, give it a good amount of grease. This method worked for me for many years of silent braking.
If the pads are good and the same for the rotors, this is what I did. instead of slapping parts and money, I simply removed all 4 calipers. Sanded the rotors by hand just to knock off the glazing on both sides. My pads were good but the contact surface was glazed so I grabbed an angle grinder with a sanding disc, and lightly sanded (while wearing a mask) the glaze off. The center pin, silencer scuff with fine sand paper to remove any rough surfaces. Fully clean inside the calipers and all around with brake cleaner.
Use a lot of grease, behind the pad, inside the caliper, the silencers, the rear caliper sliding pins, the floating pins etc. Anything that moves, give it a good amount of grease. This method worked for me for many years of silent braking.
07-18-21, 04:38 AM
#5
Mine was so bad, sounded like a siren in reverse when cold. After doing what I mentioned I had silence for many years after that.
07-19-21, 02:05 AM
#6
Driver
Thread Starter
its weird tho. it happens more frequently when i Back up and park vs just drive up and park. i back up park into a incline driveway and i back into my parking spot in the parking garage but when i dont back up and park it rarely squeals. pads and rotors are still good. looks i got some cleaning and greasing to do.
07-19-21, 06:11 AM
#7
Racer
I have what you are describing now, and it's because it did not use enough graphite grease on the teflon shims last time I did the brakes.
Use more than you think you need, and they'll be silent until the pads are gone.
Use more than you think you need, and they'll be silent until the pads are gone.
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