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New Brakes overheating?

  • 23-04-2012 1:22pm
    #1
    silenoz
    Registered Users, Registered Users 2 Posts: 126 ✭✭


    Hi, I got all new discs and pads installed a few days ago. I did a fair bit of driving over the weekend. Made sure to go easy on the brakes. When going slow I noticed a sound like metal rubbing against metal (no brake applied) so I pulled in and checked the wheels. Couldn't see any obstructions so I jacked up the car and spun the wheels by hand. Noticed that the sound was coming from rear, passenger side. Not sure what's causing the noise, possibly the disc is rubbing against the dust shield surrounding it (sound was there before the brakes were changed, but it wasn't as bad). All wheels spin freely though. Felt each disc and noticed that the rear, passenger side is slightly hotter than the rear, driver side. Also noticed the front, passenger side disc is a lot hotter than the driver side. Is it normal for new discs to be extra hot when new or normal for one side to be hotter than the other? Obviously it seems there is friction on one of the back wheels but the rest seem fine.


Comments

  • #2
    Maldesu
    Registered Users, Registered Users 2 Posts: 1,416 ✭✭✭Maldesu


    I'd get it checked to make sure they are fitted right. If its getting extra hot it could be picking up extra friction from somewhere.
    I'm not a mechanic but I worked in a garage for some time and generally speaking, if its to do with breaks, get it checked.


  • #3
    silenoz
    Registered Users, Registered Users 2 Posts: 126 ✭✭silenoz


    Maldesu wrote: »
    I'd get it checked to make sure they are fitted right. If its getting extra hot it could be picking up extra friction from somewhere.
    I'm not a mechanic but I worked in a garage for some time and generally speaking, if its to do with breaks, get it checked.

    Sound advice. I shouldn't have left it so long to get the brakes changed in the first place. Best thing to do would be to go back to to the garage.


  • #4
    silenoz
    Registered Users, Registered Users 2 Posts: 126 ✭✭silenoz


    I noticed today that the scraping sound from the back gets louder the longer I drive. When I drive from cold the scraping isn't bad. Is there anything in a brake assembly that could be interfering when the disc gets hotter?


  • #5
    Vertakill
    Registered Users, Registered Users 2 Posts: 2,262 ✭✭✭Vertakill


    Heat expands metals so it'd probably make sense that the more the brake rubs, the hotter it gets, the more it expands and more friction is caused thus giving more noise.

    They'll sometimes rub a little as new pads will be quite thick and will rub even when your brake is not being applied so a bit of rubbing is not uncommon.

    If they're only a few days on the car and it were me, I'd have a quick check for any obstructions (bent shield/surrounding) and if it looks fine, then I'd leave it for a few days and see if the noise went away after they've bedded in properly.


  • #6
    Maldesu
    Registered Users, Registered Users 2 Posts: 1,416 ✭✭✭Maldesu


    silenoz wrote: »
    I noticed today that the scraping sound from the back gets louder the longer I drive. When I drive from cold the scraping isn't bad. Is there anything in a brake assembly that could be interfering when the disc gets hotter?

    I used to see a lot of cases where stones can get stuck around the pads and cause scraping sounds. As Vertakill said, heat does expand metal so it could cause the sound to get louder. Still though, get it checked.

    If there is something obstructing the pads, they could fail when you need them, esp in this country with wet roads.
    If you leave it and the pad isn't wearing evenly, you have to replace the pad before the others. If I remember rightly the rear pads also cost more to replace that the front, as there is more parts that have to be taken off to gain access.
    Also, if there is something causing caught, the longer you leave it the more damage it could be doing to something else and it could cost you in the long run.


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  • #7
    silenoz
    Registered Users, Registered Users 2 Posts: 126 ✭✭silenoz


    Vertakill wrote: »
    If they're only a few days on the car and it were me, I'd have a quick check for any obstructions (bent shield/surrounding) and if it looks fine, then I'd leave it for a few days and see if the noise went away after they've bedded in properly.

    Yeah, I'm putting a bit of faith in the mechanic who installed the discs and pads. Surely he would have noticed if anything was wrong with the brake assembly when he was working on it. I brought the car to the same garage a few weeks so they could check out the brakes. They had a look (but didn't take the assembly apart) and brought the car for a drive and couldn't find anything.
    I will have to bring it back to them if this is still going on over the next few days...


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