How much clear road to bed in brakes - please check my work

How much clear road to bed in brakes - please check my work

Author
Discussion

omniflow

Original Poster:

1,766 posts

119 months

Monday 14th June
quotequote all
Hi,

Trying to figure out the best place to bed in my brakes (which I haven't fitted yet). The instructions say a series of 8 "near stops" from 60mph to 10 mph, accelerating immediately back to 60mph.

My assumptions and calculations are as follows (I suspect most of these are erring on the side of caution)

10mph - 60mph - 5 seconds
60mph - 10mph - 7 seconds
Thinking time at 10mph - 5 seconds
Thinking time at 60mph - 5 seconds
Average speed for the exercise 40mph

Each "near stop" is 22 seconds at an average speed of 40mph, during which time I will have travelled 0.244 miles

Therefore to do 8 "near stops" I will need 1.95 miles. This seems alot - have I made an error in my logic?

I think I can find somewhere, and at 4:30 in the morning I should have good visibility and not much traffic.


S. Gonzales Esq.

2,512 posts

180 months

Monday 14th June
quotequote all
omniflow said:
...60mph - 10mph - 7 seconds...
You’re supposed to be using the brakes, not just lifting off the gas...

aka_kerrly

11,937 posts

178 months

Monday 14th June
quotequote all
Go for a few laps of a local industrial estate;)

Any bit of dual carriage way with a few roundabouts is an ideal opportunity to do a few hard stops.

S. Gonzales Esq.

2,512 posts

180 months

Monday 14th June
quotequote all
I did once set fire to my brakes in Milton Keynes - that’d do if you’re nearby.

Tony1963

3,145 posts

130 months

Monday 14th June
quotequote all
I just use common sense and local country roads. All you’re trying to do is get the pads and discs hot, and a layer of pad material on the disc in an even coating. If they’re not smelly-hot on the last application, you’ve not gone hard enough.

Edited by Tony1963 on Monday 14th June 23:02

Scrump

14,750 posts

126 months

Monday 14th June
quotequote all
omniflow said:
Hi,

Trying to figure out the best place to bed in my brakes (which I haven't fitted yet). The instructions say a series of 8 "near stops" from 60mph to 10 mph, accelerating immediately back to 60mph.

My assumptions and calculations are as follows (I suspect most of these are erring on the side of caution)

10mph - 60mph - 5 seconds
60mph - 10mph - 7 seconds
Thinking time at 10mph - 5 seconds
Thinking time at 60mph - 5 seconds
Average speed for the exercise 40mph

Each "near stop" is 22 seconds at an average speed of 40mph, during which time I will have travelled 0.244 miles

Therefore to do 8 "near stops" I will need 1.95 miles. This seems alot - have I made an error in my logic?

I think I can find somewhere, and at 4:30 in the morning I should have good visibility and not much traffic.
You are overthinking this.

hellorent

168 posts

31 months

Monday 14th June
quotequote all
^^^^^^^^^^^^^^^^^^^^^^^ This

Piersman2

6,210 posts

167 months

Tuesday 15th June
quotequote all
biggrin - yep, only a little bit.

OP, just change them over and then take it for a run whilst expecting the first few presses of the brake to be a bit spongey as the pads bed in.

After that just carry on as normal.

If you're particularly concerned get the car out on a decent speed road and give it a few semi-hard brakes.

Hereward

2,970 posts

198 months

Tuesday 15th June
quotequote all
Or hire a runway / airfield.

rustednut

610 posts

15 months

Tuesday 15th June
quotequote all
I am curious to which brand gives such specific bedding in advice.

Bedding in just needs to be a process of heating up, but not excessively, a few times and avoid any emergency style braking until a few heat cycles have been achieved.

On most cars, with most brands, it is unlikely to even need any specific bedding in, just sensible braking for around 150 miles of normal use.

How u doing

21,985 posts

151 months

Tuesday 15th June
quotequote all
Scrump said:
omniflow said:
Hi,

Trying to figure out the best place to bed in my brakes (which I haven't fitted yet). The instructions say a series of 8 "near stops" from 60mph to 10 mph, accelerating immediately back to 60mph.

My assumptions and calculations are as follows (I suspect most of these are erring on the side of caution)

10mph - 60mph - 5 seconds
60mph - 10mph - 7 seconds
Thinking time at 10mph - 5 seconds
Thinking time at 60mph - 5 seconds
Average speed for the exercise 40mph

Each "near stop" is 22 seconds at an average speed of 40mph, during which time I will have travelled 0.244 miles

Therefore to do 8 "near stops" I will need 1.95 miles. This seems alot - have I made an error in my logic?

I think I can find somewhere, and at 4:30 in the morning I should have good visibility and not much traffic.
You are overthinking this.
One of early jobs at the local garage was a brake bedder inner. It was a promotion.

Penelope Stopit

8,833 posts

77 months

Tuesday 15th June
quotequote all
omniflow said:
have I made an error in my logic?
Yes, you've not allowed any time for using a calculator to count how many times you've been through the process

I make it 10 seconds to grab a calculator and press the buttons to add 1

8 x 10 seconds should be added to the total time

Now here's the tricky bit. Although the total time needs 1 minute and 20 seconds adding to it, the distance travelled will remain close to the same as above if you stop the car to use the calculator.

If you use the calculator while driving, the distance will obviously increase and you may have to allow time for problems with the police if they see what you are up to

If you don't use a calculator you may forget where you are up to and have to start all over again

Something else to consider is that although 10 seconds has been allowed for each calculator entry, you may be fast fingered and manage it in 5

It's complicated

omniflow

Original Poster:

1,766 posts

119 months

Tuesday 15th June
quotequote all
rustednut said:
I am curious to which brand gives such specific bedding in advice.

Bedding in just needs to be a process of heating up, but not excessively, a few times and avoid any emergency style braking until a few heat cycles have been achieved.

On most cars, with most brands, it is unlikely to even need any specific bedding in, just sensible braking for around 150 miles of normal use.
I'll (mostly) ignore the massively sarky posts, and answer this one. The pads and disks are from Formula Dynamics, and the bedding in advice they provide is exactly as outlined in the OP.

For those who are being slightly unkind - I merely asked advice. It's not something I've ever done before. The disks and pads were relatively expensive and I want to make sure I get it right. I bow down to your superior knowledge and experience and apologise profusely for asking the question.

CoolHands

13,229 posts

163 months

Tuesday 15th June
quotequote all
You just brake heavily a few times, that’s it. Use common sense and make sure no one is behind you.

Penelope Stopit

8,833 posts

77 months

Tuesday 15th June
quotequote all
My post was serious with a touch of humour added

You will be cursing if you lose count

Tony1963

3,145 posts

130 months

Wednesday 16th June
quotequote all
OP,

Just read the instructions and try to follow the general idea. There are too many variables for there to be exact number attached to the process, such as ambient temperature and exact weight of your car at the time.

rustednut

610 posts

15 months

Wednesday 16th June
quotequote all
omniflow said:
rustednut said:
I am curious to which brand gives such specific bedding in advice.

Bedding in just needs to be a process of heating up, but not excessively, a few times and avoid any emergency style braking until a few heat cycles have been achieved.

On most cars, with most brands, it is unlikely to even need any specific bedding in, just sensible braking for around 150 miles of normal use.
I'll (mostly) ignore the massively sarky posts, and answer this one. The pads and disks are from Formula Dynamics, and the bedding in advice they provide is exactly as outlined in the OP.

For those who are being slightly unkind - I merely asked advice. It's not something I've ever done before. The disks and pads were relatively expensive and I want to make sure I get it right. I bow down to your superior knowledge and experience and apologise profusely for asking the question.
Never heard or had experience of that brand, and not gone looking for any either.

Is it for road use or for track?

But exact speeds and amount of stops will not be critical, as long as a few repeated stops are done, to build up heat enough, so if in doubt just do a few extra stops if you cant get back up to speed and stop again repeatedly. Get the brakes warm by firm braking, and repeat, but not too hot too soon (emergency braking style).