Sanding new brake discs

[Harry Bloomfield]

Oh , I only use brakes to stop , not adjust speed , was taught that was careless driving .

I never mentioned using brakes to adjust your speed, but I agree it is often, not always, shows poor driving ability.

 

[foxhole]

I never mentioned using brakes to adjust your speed, but I agree it is often, not always, shows poor driving ability.

Oh My mistake but you did say “It always appear, when slowing down to enter a slip road off the motorway.” which suggests braking .

 

[Harry Bloomfield]

Oh My mistake but you did say “It always appear, when slowing down to enter a slip road off the motorway.” which suggests braking .

A down sloping slip road, off the motorway, leading to a roundabout. How else would you lose speed?

I avoid braking on the motorway, and disrupting others on the motorway, that's what slip roads are for.

 

[foxhole]

A down sloping slip road, off the motorway, leading to a roundabout. How else would you lose speed?

I avoid braking on the motorway, and disrupting others on the motorway, that's what slip roads are for.

Reduce throttle .

 

[freddiemercurystwin]

Oh God it's battle of the Nerds!

 

[Harry Bloomfield]

Reduce throttle .

and if throttle reducing would still have you coming to the end of the slip, at the roundabout, going to fast - what then?

 

[foxhole]

and if throttle reducing would still have you coming to the end of the slip, at the roundabout, going to fast - what then?

You brake of course , simple .

 

[Nige F]

There is a windy road near me with a 40 limit . I have to admit to maintaining steady speed 40 all along it and left foot touching the brakes @ every corner = thwarts the tailgaters !!

 

[Avocet]

I agree. I used to do a lot of track days and put significant effort into finding a disc/pad combination that wouldn't end up with really nasty judder from uneven pad deposition or the pad falling apart because it was overheated before it had gassed off properly. Proper performance pads have a specified bed in process that does work and then ensuring that the breaks were cooled before coming to a standstill prevents the localised deposition problem that so many people think is warped discs.

But conventional OEM quality brake pads are designed to not need a specific bed in process and from fitment.

Nevertheless they can benefit from being properly bedded-in. I've fitted new discs and pads, and it can be some time before there's uniform contact between the disc and the pad over the whole area of the disc.

 

[Avocet]

No, that judder through the pedal, is to warn you the ABS is having to operate, due to one or more wheels slipping on the surface. This judder, tends to appear most at certain speeds, when braking, and not felt so much through the pedal.

I had a Scorp, many years ago, which developed the judder. It always appear, when slowing down to enter a slip road off the motorway. It was so bad, I was on the point of replacing the front discs, when I happened across the explanation and the fix - up to 70 on a quiet road, brake hard almost to a stop, without actually stopping, repeat once more, and the judder just disappears. I've used the fix since then, on other cars, and each time it has worked.

It's caused by braking hard, coming to a full stop, with the disc hot, and the pad pressed hard against the hot disc. Let it roll to a gentle stop, use the handbrake.

Unless you've given it a real pasting, in which case, leave it in gear or you'll just get the pads that are actuated by the handbrake to "weld" themselves to the discs instead.

 

[Avocet]

Isn’t judder due to ABS kicking in after harsh braking .?

No. ABS only cuts in during braking (usually only during harsh braking).

 

[Avocet]

Oh , I only use brakes to stop , not adjust speed , was taught that was careless driving .

There must be a lot of careless F1 drivers then!

 

[foxhole]

No. ABS only cuts in during braking (usually only during harsh braking).

You just repeated what I said?

 

[foxhole]

There must be a lot of careless F1 drivers then!

You race on the highway?

 

[Avocet]

You just repeated what I said?

No, you said: "Isn’t judder due to ABS kicking in after harsh braking .?" (my underline).