when to change brake pads/disc - minimum mm?

londonTiger

FiremanDave wrote: »

Do what?

Just go steady if you do front and rear until they bed in.

I would much rather to the backs, and let it bed in and then do the fronts. Too much of a risk to do all 4 wheels at the same time IMO.

FiremanDave

londonTiger wrote: »

I would much rather to the backs, and let it bed in and then do the fronts. Too much of a risk to do all 4 wheels at the same time IMO.

Where's the risk driving at 4mph round London?

londonTiger

FiremanDave wrote: »

Where's the risk driving at 4mph round London?

I'd rather not find out. brake pads are designed to wear but at the same time they need to last for 40,000 miles, they're not going to wear to form to the old discs just by a short 4mph drive around the block.

E.g. I fitted new brake pads and it was making a constant and faint hissing noise, I think the shims were making contact with the disc but could be making contact with the pads. It took 240 mile round trip today to Birmingham for the hissing sound to go away.

Hintza

londonTiger wrote: »

I would much rather to the backs, and let it bed in and then do the fronts. Too much of a risk to do all 4 wheels at the same time IMO.

Best never buy a new car then!

FiremanDave

londonTiger wrote: »

I'd rather not find out. brake pads are designed to wear but at the same time they need to last for 40,000 miles, they're not going to wear to form to the old discs just by a short 4mph drive around the block.

E.g. I fitted new brake pads and it was making a constant and faint hissing noise, I think the shims were making contact with the disc but could be making contact with the pads. It took 240 mile round trip today to Birmingham for the hissing sound to go away.

Says who?

Mine are at 60k but will need doing soon.

londonTiger

Hintza wrote: »

Best never buy a new car then!

yeah just jump into the discussion without reading back at the context.

We're talking about new pads on old disc. All old discs have some scoring on them.

FiremanDave

londonTiger wrote: »

yeah just jump into the discussion without reading back at the context.

We're talking about new pads on old disc. All old discs have some scoring on them.

I think his comment has gone straight over your head.

Joe_Horner

The thing is, new pads on old disks will still give virtually full braking force before they're bedded in if they have to, especially with modern servos to help them. But doing so can glaze the pads which can throw up more issues (squealing, disk wear, quicker fade etc) down the line.

As long as you don't drive on your brakes changing them all isn't going to be a safety issue, but might cost you more in the long run.

londonTiger

FiremanDave wrote: »

I think his comment has gone straight over your head.

FiremanDave, you seem very pedantic for a new member. I wonder if you are one of those bitter "old guards" on these boards whose joined up on a new account.

You've registered here on: 01-11-2014. You have 489 posts (most of which on motoring). That's about 50 posts a day.

Does anyone know someone who was banned before 1-11-2014 who had the same prolific posting activity?

colino

"I think the shims were making contact with the disc". Have a think about that and if you don't think there is anything wrong, don't drive your car and have a grown up check your brakes.