Brake bleed nipples

Brake bleed nipples

Author
Discussion

TT Tim

Original Poster:

4,143 posts

214 months

Friday 22nd February 2008
quotequote all
So, a follow up.

Thanks to Julian's help we removed the old bleed screws that were intact using his heat and freeze method, and yes it works a treat. Wish I'd tried that before breaking three of the buggers!

Here's a pic of a very rusty bleed screw:



We're guessing that it's got that much rust due to brake fluid being hydrascopic and therefore holding water. We may be wrong but I couldn't see any other explanation.

It was my intention to helicoil the holes, but Julian did such a good job of drilling them that I don't think I'm going to need to. biggrin

I have ordered a seal kit, new bleed screws and fluid from AP racing so hopefully it'll all go back together early next week.

I have ordered new bleed screws as I had purchased some stainless ones, but they turned out to be completely wrong. A lesson there for everyone, even though the thread was correct (M10 x 1) the screw was too short, and the vital angle at the base was wrong so it wouldn't have sat flush with the internal face of the hole in the caliper. So, if you buy new bleed screws, check them against the old ones, carefully!

More picies here: http://tvrcerbera.co.uk/Gallery/thumbnails.php?alb...

Tim

Edited by TT Tim on Friday 22 February 13:32

mikesr

672 posts

198 months

Friday 22nd February 2008
quotequote all
I think Trackcar must have worked his magic on my callipers when he fitted stainless hoses a couple of years ago. The bleed nipples loosened without any drama at all. Although having seen the state of yours Tim I'm going to remove them and check their condition. They are seriously rusty yikes

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
Getting there, calipers cleaned and ready to be rebuilt:



Fluid, bleed screws and new seals arrived today, so fingers crossed they'll be back working by the weekend. biggrin

Threads seem okay, now that they've been chased with a No.2 tap.



Tim

julian64

13,311 posts

221 months

Monday 25th February 2008
quotequote all
Thats brilliant Tim. Quite jealous of the way you got those calipers back to looking original. What colour are you going to paint them.

P.S. Whats a number 2 tap?

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
Not painting them Julian, have given them a quick blow over with spirit resisting lacquer.

I meant a 2nd tap, so, as you recommended a blind tap.

Easy to get them that clean, you've no excuse you've got the glass beads and the cabinet. biggrin

One thread 'rocks' slightly but does tighten up, my only worry is when bleeding them, but we'll see.

Thanks again

Tim

julian64

13,311 posts

221 months

Monday 25th February 2008
quotequote all
You could always cheat by zinc plating a nipple thread smile

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
julian64 said:
You could always cheat by zinc plating a nipple thread smile
Now there's an idea worth trying!

Will give it a go.

Tim

caduceus

6,001 posts

233 months

Monday 25th February 2008
quotequote all
Tim, calipers look lovely thumbup

Was Detox C all that you used? Did you have to scrub them after soaking them in D C?

I used some on the manifold bolts overnight, and checked them this morning. They look ok but nothing spectacular. I used the 1:19 part strength. So left them in there all day. Got back and not alot of difference. So trying the 1:4 ratio now to see the results in the morning.
Keep up the good work smile

Cad

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
No, these were cleaned with glass beads in my blast cabinet.

No point using Deox C on the calipers, in fact you shouldn't, as they are alloy and Deox C only works on ferrous metals.

I was very impressed with the results I've had from Deox C, but tbh most of the bits I've cleaned have been blasted.

Tim

caduceus

6,001 posts

233 months

Monday 25th February 2008
quotequote all
Was the blast cabinet expensive?
Where's the best place to get them? Machine Mart?

Cheers

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
caduceus said:
Was the blast cabinet expensive?
Where's the best place to get them? Machine Mart?

Cheers
Funnily enough I was chatting to a friend today about blast cabinets...

I use a pressure vessel, one of these: http://www.acegrit.co.uk/acegrit/gritblaster/page3...

The cabinet I made myself from 15mm ply. It's not very 'clean' when you're blasting using media such as sg or really dirty stuff. I wear a decent 3M mask as black snot is not funny! biggrin

Whereas you could buy: http://www.machinemart.co.uk/shop/product/details/...

Which is everything you'd need, it's totally contained and clean!

HTH

Tim



odyssey2200

18,650 posts

176 months

Monday 25th February 2008
quotequote all
http://cgi.ebay.co.uk/5pcs-Screw-Stud-Bolt-Extract...

I have used these in the past to remove snapped off bleed nipples.

Not always sucessful but worth a try.
They are effectively a LH threaded bit which grips as you screw it in to whats left of your nipple.
IYKWIM

caduceus

6,001 posts

233 months

Monday 25th February 2008
quotequote all
Yeah, I think I will go for the M/Mart jobbie.
Thanks Tim.

TT Tim

Original Poster:

4,143 posts

214 months

Monday 25th February 2008
quotequote all
odyssey2200 said:
http://cgi.ebay.co.uk/5pcs-Screw-Stud-Bolt-Extract...

I have used these in the past to remove snapped off bleed nipples.

Not always sucessful but worth a try.
They are effectively a LH threaded bit which grips as you screw it in to whats left of your nipple.
IYKWIM
Ta, but we've got them out. Having used EziOuts for various jobs over the years, with little success I've given up on them, they invariably break adding to the problems.

I'm convinced that it wouldn't be any different in this case. However Julian's method of heat and cold does work and I would recommend it.

Tim

PS The best and only extractors I've ever had had 100% success with is the Irwin ones, such as: http://www.irwin.com/irwin/consumer/jhtml/browse.j...

Tim

julian64

13,311 posts

221 months

Monday 25th February 2008
quotequote all
That machine mart blast cabinett is the one I have in my workshop. However you might want to look at the one in the frost catalog as they seem to have the choice of a make your own or posh metal one. Also the two major choices for grit are aluoxide and glass bead. You need a way of changing without too much hassle. Not the case with mine but a handy emptying spout on the frost one.

Also the machine mart cab needs a fairly strong compressor with about 14CFM at 100psi to run it at anything like cleaning power. I don't know how the others fair.

Erich Stahler

2,876 posts

237 months

Wednesday 17th June 2015
quotequote all
Sorry for re-posting on an old thread, but whats the latest thinking on this? I have nipples shearing off.

Have any of you that replaced old broken ones with stainless found they were ok last time you bled the brakes?

ukkid35

5,556 posts

140 months

Thursday 18th June 2015
quotequote all
Erich Stahler said:
Sorry for re-posting on an old thread, but whats the latest thinking on this? I have nipples shearing off.

Have any of you that replaced old broken ones with stainless found they were ok last time you bled the brakes?
First thing is never use a spanner or a ratchet - only use a socket on a T bar if they seem even slightly obstinate.

Secondly, flush fluid regularly, annually minimum, more frequently if used on track.

Next make sure the rubber covers are present and not damaged by spanner monkeys when they balance the wheels.

Finally, replace the nipples themselves if in any doubt about their condition, they are only £1 each.

K33LER

214 posts

184 months

Sunday 21st June 2015
quotequote all
E2D Engineering in Ashford Kent re-milled my callipers and put in stainless steel nipples to prevent further issues. Some needed oversize nipples, some just needed replacing. Hope that helps?

Erich Stahler

2,876 posts

237 months

Monday 22nd June 2015
quotequote all
K33LER said:
E2D Engineering in Ashford Kent re-milled my callipers and put in stainless steel nipples to prevent further issues. Some needed oversize nipples, some just needed replacing. Hope that helps?
Hi there, that's just what i'm looking for, don't suppose you have any more in the way of contact details as that's not throwing up anything that likely from a Google search?
Thanks.

MackemPete

965 posts

185 months

Friday 3rd July 2015
quotequote all
Blow torch and pipe freeze worked a treat for me last night. Thanks for that tip smile

All 8 came free with minimal effort.