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Old 18-01-2009   #1
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Discs warped - change pads too

i have a terrible brake judder on my bravo. Feels like the discs are warped.

took the wheel off and the pads look almost new to me, plenty of meat, but the disc doesn't spin freely, half the rotation is stiff the other half not so stiff to turn by hand

can i just get new discs and re use the pads?
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Old 18-01-2009   #2
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Re: Discs warped - change pads too

it could be a sticky caliper rather than warped discs
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Old 19-01-2009   #3
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Re: Discs warped - change pads too

Hi, i'm new here but just thought i'd mention my bravo came with a pile of service history, and 2 out of it's 12 services have replaced disk's because they have warped! i think my front N/S is begining to warp too. my replace mine with uprated vented disks (cooler means less chance of warping right???)
So i'd also like to know if i could just change the disks.
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Old 19-01-2009   #4
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Re: Discs warped - change pads too

hi i would replace the pads as well for what they cost,in the last year i have changed about 20 pairs of discs all on bravos cause they were warped and you cant fit old pads to new discs......you wont get the correct braking effort and can end up with the car pulling to one side and if one side is warped the pads are not going to of worn evenly even though they may look like they have.....it only takes 30 mins to do both sides and thats taking your time.......
never try to cut corners with brakes or steering components......certainly think about uprating from standard items x-drilled,grooved and vented best keep the nasty heat out!!!!!!
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Old 19-01-2009   #5
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Re: Discs warped - change pads too

think i'll do discs and pads then.

i've only bought the car as a 2nd car, so looking to spend as little as possible :lol:

are the mintex discs and pads on ebay ok, or will i be better off getting something else?

spent about 1k on brakes just before christmas
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Old 19-01-2009   #6
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Re: Discs warped - change pads too

do you happen to hold your foot on the brakes when you stop at traffic lights?
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Old 19-01-2009   #7
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Re: Discs warped - change pads too

i've only had the car for a few days, a local lady had it, and she thought the clutch was broken, i bought it cheap, fixed that.

but gave it a road test and the brakes judder and it feels like its misfiring on acceleration.

so going to try and sort these bits out then i can start using it asap.

these are the brakes i've seen

http://cgi.ebay.co.uk/FIAT-BRAVO-1.4...05122001r28838
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Old 19-01-2009   #8
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Re: Discs warped - change pads too

You'll have to take this with a pinch of salt if you try it as they are referring to much larger brakes but the priciple is the same

Quote Originally Posted by FCCUK
This procedure was lost with the old forum, but has saved many Coupe owners a lot of money, by preventing the replacement of "warped" discs that weren't actually warped.

The cause of brake judder isn't actually a physical warp in the disc - its an uneven build-up of pad material on (in) the disc surface. Often, the effect is felt as an on-off-on-off feeling when braking really gently, rather than a violent judder from high speeds.

When a disc gets hot, pad material is chemically transferred into the crystalline structure of the disc material. This is the purpose of bedding-in - it deposits an even amount of pad material around the disc.

The on-off-on-off feeling is actually caused by one section of the disc being "grippier" (or occasionally, less grippy)than the rest of the disc. This is caused by the pad material being deposited unevenly around the discs.

There are two reasons this:

1) Wearing away of the original bedding-in process pad material, leaving some of the disc surface with less pad material than others - this is most commonly caused by prolonged periods without heavy braking (winter?)

2) Excess material being deposited on one part of the disc - almost always caused by coming to a complete standstill with the brakes on when they're very hot.

In either event, the procedure is the same:

From Pagid's own bedding-in procedure:

Basic bedding-in:

4 - 6 stops with medium brake pressure from about 90mph to 50mph - distance between stops about 300 - 400m

Immediately after basic bedding-in:

One stop with medium to heavy brake pressure, from 110mph - 50mph
then 3 - 4 "recovery" stops using "basic" method.

Repeat the big stop and 3 - 4 light stops a further 2 times.

Important

NEVER come to a complete stop when bedding-in - it will ruin your hard work

NEVER get the ABS to cut in - its the same as coming to a complete stop

ALWAYS allow about 500 metres after a big stop to let the brakes cool a little (Pagid suggest 500m - I suggest double this, as Coupe's brake cooling is awful)

Given the speeds mentioned above (the process is designed for the track, not the road), I strongly suggest you only ever perform this procedure on your own quiet stretch of (ahem) private road

Once you've conducted the bedding-in procedure, drive for a good few miles to let the brakes completely cool down before stopping the car.

Many sets of discs have been saved with this method - its always worth a try, as there is absolutely nothing to lose (apart from your licence, if you try it with Plod around )

Courtesy Nigel
http://www.fccuk.org/forum/ubbthread...e=1#Post230087

Ry
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