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Thread: how hot should a caliper get?

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    Default how hot should a caliper get?

    Had a bit of an issue with the front brakes on my 2.0t sri estate. I've recently changed the disks and pads. This is a 302mm setup.

    Disks from LMF (genuine vauxhall) and pads from Vauxhall with replacement spring clip etc. All the surfaces cleaned up to a mirror finish, greased etc before replaced. Calipers pushed in gently with a clamp.

    On a long journey (240 miles on motorway, little braking) the calipers were very mildly warm to the touch on the outside part (furthest from the centre). On subsequent 20 mile journeys on a-roads/country lanes with a fair bit of braking the calipers were pretty warm - although never hot enough that I couldn't put my finger on the outside part for a second or two. The wheel centres were also pretty warm. I didn't touch the disks - I guess they were very hot!!!

    Having never felt my brakes before the disks were changed (56,000 miles and six years), I'm not sure if this is normal or not? Are the pads 'hanging on?' the car appears to roll freely with no grinding or scraping when the brakes are released, and can be pushed about as easily as a heavy car should be by hand.

    I think I might be getting paranoid here, but I want to be sure....

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    Regular Member Stoxie's Avatar
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    f it burns your tongue when you lick it, it's to hot

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    Regular Member Shrimpy's Avatar
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    Hi Ed.

    From your descriptions the brakes would seem to be fine. If all the brakes heat up evenly felt with the back of the hand through the wheel spokes (dont touch the discs !) then all is fine.

    Any binding or sticking is felt quickly enough when coasting or on the final roll to halt at lights (feels like pulling back or handbrake left on ). Also any sort of binding creates massive heat and is quite obvious when you do the above check after driving.

    Most of the above is gained through bitter experience of different cars and many different brake problems, hope this pute your mind at rest.

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    Regular Member gazturbo's Avatar
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    My o/s/r caliper seized on, the disc glowed cherry red. someone made an baws up of the caliper, the gaiter round the piston was all burst. so new caliper was needed.

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    Ex-Staff Full Member John LE's Avatar
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    Start to worry if you see this

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    That all seems quite re-assuring. The hottest the calipers have got, I could still lay my finger on the 'outside' of the caliper for a couple of seconds before it was hot enough to hurt. One side was slightly hotter than the other, but not by much.

    The brakes felt 'normal' all the time, not spongy or weak at all, although to be honest I can't recall what they felt like before!

    I guess that stopping all that weight you are converting a lot of kinetic energy into heat, and it has to go somewhere

    On a previous car I've had the calipers get so hot it boiled the brake fluid, and that was scary. I guess thats why I'm a bit paranoid

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