Bleeding Brembo calipers with twin bleed nipples

[Davie]

I've been getting a bit conflicting advice on this from the usual sources!

Brembo 4 pots, thus the have a bleed nipple outboard and a bleed nipple inboard on every caliper.

For bleeding:

1. Outboard then inboard

2. Inboard, then outboard

3. It doesn't matter...

Obviously furthest caliper from the master cylinder and work in but it the twin nipples that confuse me... there's a joke in there somewhere!

Anything else worth mentioning when it comes to these, fire away!

Thanks

[Mignon]

If you had the faintest comprehension of the simple physics involved then you'd know it can't possibly make a rat's arse of difference which order you bleed the calipers in and which order you bleed the inboard and outboard bleed nipples, or even both together.

[TooMany2cvs]

Mignon said:

If you had the faintest comprehension of the simple physics involved then you'd know it can't possibly make a rat's arse of difference which order you bleed the calipers in and which order you bleed the inboard and outboard bleed nipples, or even both together.

Harsh... but absolutely fair.

[Mignon]

TooMany2cvs said:

Harsh... but absolutely fair.

I'm still trying to decide what inscription I want on my tombstone. As I get older it becomes a more pressing issue. At present I'm hovering between "Harsh..but absolutely fair" and " Yes, I was a c**t but I was usually right."

[The Wookie]

If you’re filling a caliper from dry then I find bleeding the inboard side of most of our calipers subjectively seems a bit quicker, but it doesn’t matter

If you’re just giving it a bleed then as said makes bugger all difference

[stevieturbo]

Do them both simultaneously....

[227bhp]

Mignon said:

I'm still trying to decide what inscription I want on my tombstone. As I get older it becomes a more pressing issue. At present I'm hovering between "Harsh..but absolutely fair" and " Yes, I was a c**t but I was usually right."

Hopefully there's room for 'disputatious'.

[Davie]

Mignon said:

If you had the faintest comprehension of the simple physics involved then you'd know it can't possibly make a rat's arse of difference which order you bleed the calipers in and which order you bleed the inboard and outboard bleed nipples, or even both together.

Thanks

I do have the faintest comprehension of physics however Brembo 4 pots are new to me and having checked online, there does seem to be some conflicting advice on the best bleeding procedure and hence why I asked if the questions, if there was a specific process or anything to be aware of...

Your expert input has been gratefully received and yes, go with the latter of the inscriptions...

[Mignon]

I'm leaning that way

[TEKNOPUG]

Mignon said:

If you had the faintest comprehension of the simple physics involved then you'd know it can't possibly make a rat's arse of difference which order you bleed the calipers in and which order you bleed the inboard and outboard bleed nipples, or even both together.

Someone needs to tell all these motoring manufacturers that waste time, money & effort printing brake bleeding sequences in their user manuals...

[GreenV8S]

I think it makes sense to bleed the longest runs first, but I don't see it as a big deal.

I imagine the inside of the brake circuit as full of dirty brake fluid with various contaminations that might gradually settle out. Just the act of moving fluid through the system will tend to pull these contaminants back into suspension so they can be carried out with the fluid as it is expelled. The more fluid is moved through the system, the more chance there is to flush this stuff out.

On that basis, bleeding the longer runs first means that the oldest fluid travels the longest possible distance before being expelled, which makes the best possible use of it to flush contaminants from the system.

Granted that you could get just the same benefit by flushing through the corresponding quantity of fresh, new fluid through the system, but if there is any benefit to be had from pushing the old fluid through the system then expelling it via the longest pipe run will maximise that benefit.

[TooMany2cvs]

GreenV8S said:

I think it makes sense to bleed the longest runs first, but I don't see it as a big deal.

I can't understand it, either. The same amount of fluid has to go down the same amount of pipe, whatever order you do it in. The bit from master to split(s) gets more fluid through it than the individual runs.

My Landy has twin leading shoe front drums, with a pair of cylinders in each. You should see some of the Landy lot on FB insisting that it makes a big difference whether the fluid goes into the upper or lower cylinder first... How? So long as the outlet pipe or nip is above the inlet pipe, the fluid doesn't know or care...

[xjay1337]

I have twin nipples too and I personally do the outer one first.
But wouldnt matter to me if someone forced me to do it the other way.