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Old 11-01-2015, 20:09   #1
squeakyclean32
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Bleed Nipple rot.

We are sending our Brembo's off for a new coat of paint. They are now off the car and we have removed the bleed nipples to drain the fluid before sending the calipers off. We have seen nipples that are dirty/corroded before but were surprised to find some of these corroded internally. Is this normal?

Thanks for any advice





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Old 11-01-2015, 20:30   #2
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YEAH quite normal ,brake fluids quite corrosive and theres allways a little bit left on the end of the bleed nipple when youve bleed the calipers
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Old 11-01-2015, 20:53   #3
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Just replace them for new before refitting, job done! At least you managed to get them all out in one piece.
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Old 11-01-2015, 20:58   #4
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no it's not normal, although from memory they are of a dissimilar metal to the calliper it certainly won't help
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Old 11-01-2015, 21:13   #5
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How old is the brake fluid? brake fluid is hygroscopic absorbing water, could have caused this
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Old 11-01-2015, 21:21   #6
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Have the calipers been on a running car or stored for a while off the car with the nipples loosened off?
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Old 12-01-2015, 06:24   #7
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Thanks for all the replies.

We imported the car last year, so we do not have any previous service history. For all we know the fluid could be as old as the car.

We will source some new nipples to go with the new paint.

Does this internal corrosion suggest we may have issues elsewhere in the pipes etc?
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Old 12-01-2015, 06:25   #8
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Forget to mention we are going to be fitting new braided hoses to the calipers and changing the fluid.
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Old 12-01-2015, 06:49   #9
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no it's not normal, although from memory they are of a dissimilar metal to the calliper it certainly won't help
of course its normal K ,theres a very small amount ot fluid left on the outside of the seating face ,which as you can see is clean ,this will cause the bleed nipple to corrode
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Old 12-01-2015, 08:38   #10
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You can get some shiny new stainless steel nipples that won't corrode like that. HEL Performance can supply both those and some nice stainless steel braided brake lines if you need them

They also supply decent brake fluid like ATE Super Blue, Castrol SRF and Motul etc so could be a one stop shop for when you get the calipers back.

PM HEL Performance on here if you want to order
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Old 12-01-2015, 11:24   #11
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You can get some shiny new stainless steel nipples that won't corrode like that. HEL Performance can supply both those and some nice stainless steel braided brake lines if you need them

They also supply decent brake fluid like ATE Super Blue, Castrol SRF and Motul etc so could be a one stop shop for when you get the calipers back.

PM HEL Performance on here if you want to order
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Old 12-01-2015, 14:36   #12
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of course its normal K ,theres a very small amount ot fluid left on the outside of the seating face ,which as you can see is clean ,this will cause the bleed nipple to corrode
NO yet again I repeat NO it's not normal!! the corrosion process tells me something isn't right!!
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Old 12-01-2015, 15:49   #13
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so how is it NOT normal, k
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Old 12-01-2015, 17:04   #14
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If you have a look at the corroded one, where it's sealed at the very tip it is still like new. The rest of the nipple is prone to water ingress (down the treads and blead hole if nipple is loose), I've seen ptfe tape used to seal the threads and this will stop water ingress.

The Brembo nipples have a very thin protective coating, using stainless is a good idea but you've also got to bear in mind the water will still corrode the caliper body if you've not sealed the threads and got a tight fitting cap.
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Old 12-01-2015, 18:22   #15
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so how is it NOT normal, k
notice the word must
Corrosion
Brake fluids must not corrode the metals used inside components such as calipers, wheel cylinders, master cylinders and ABS control valves. They must also protect against corrosion as moisture enters the system. Additives (corrosion inhibitors) are added to the base fluid to accomplish this.
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