Braking vibration
Discussion
andyiley said:
Knackered discs & pads is what it is mate, all need replacing.
Barely 2/3rds of the surface is "in use" by the swept area of the pads, the rest is VERY badly corroded.
So what would you suggest is the root cause of the corrosion on the disc? (HumbleJim I just posted in your other thread) Barely 2/3rds of the surface is "in use" by the swept area of the pads, the rest is VERY badly corroded.
BritishRacinGrin said:
andyiley said:
Knackered discs & pads is what it is mate, all need replacing.
Barely 2/3rds of the surface is "in use" by the swept area of the pads, the rest is VERY badly corroded.
So what would you suggest is the root cause of the corrosion on the disc? (HumbleJim I just posted in your other thread) Barely 2/3rds of the surface is "in use" by the swept area of the pads, the rest is VERY badly corroded.
HumbleJim said:
Thanks I saw your post. I've had the car for 11 months and covered 4000 miles, the discs never looked too good. Prior to my ownership the car had been doing very few miles (20k in the last 10yrs) so I'm catching up on quite a few things caused by lack of use. The calipers do seem okay though, not sticking and the pads have worn evenly.
If the pads were contacting the discs properly there'd be no chance of the disc being so corroded on what should be the friction face. This is fairly typical for rear disc brakes, they simply don't work hard enough in gentle driving so lack of exercise contributes to the whole thing becoming seized up. Corrosion builds up on the pad carriers until the pads aren't free to move, and then that lack of movement allows the piston to sit still for a while. I'd get the calipers and carriers off and then remove the pads (usually with a hammer when they're in this state!), then attack the carrier with a wire brush. If the corrosion is quite bad I dress up any surfaces where the pad touches the carrier with a small fine file. Copaslip these surfaces to give them a little lubrication. The sliding pins normally need cleaning up with a scotch pad and some light oil. I've never once replaced a caliper because I've found they often come back to life once everything else is moving freely, if they wind back okay they'll probably be fine.
I find that if you do a half-arsed job with the cleaning up and lubricating the problem will probably resurface sooner rather than later
BritishRacinGrin said:
So what would you suggest is the root cause of the corrosion on the disc? (HumbleJim I just posted in your other thread)
Discs tend to corrode more under the pad, if the vehicle is left parked for a long time in wet/humid conditions. You can clean off the surface rust when you drive, but more metal is removed where the pad was, leaving you with a pad shaped shallow depression in the disc. Hello vibrations. I don't think the disc is that badly pitted, get it all working properly and the disc will probably clean up in a couple of hundred miles.
That said, if new discs and pads are 130 quid then it's not worth putting used parts back on once you've had it all apart. Personally I use OEM pads though- I've never been fully satisfied with a set of 'OEM equivalent' pads, even from reputable brands.
That said, if new discs and pads are 130 quid then it's not worth putting used parts back on once you've had it all apart. Personally I use OEM pads though- I've never been fully satisfied with a set of 'OEM equivalent' pads, even from reputable brands.
I couldn't remove one of the rear pads when I was trying to clean it up the other day, caliper bolts seemed stuck to.
I soaked the caliper bolts with some "loosen up" and they are free now.
I've ordered premium discs/pads/fitting kits from GSF £70 (bargin) I will give it a good clean and a smear of copper slip when fitting.
£130 was for the front vented discs, they look a lot better so I'll see how it goes.
I soaked the caliper bolts with some "loosen up" and they are free now.
I've ordered premium discs/pads/fitting kits from GSF £70 (bargin) I will give it a good clean and a smear of copper slip when fitting.
£130 was for the front vented discs, they look a lot better so I'll see how it goes.
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