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Caliper bleed valve

944cabby

944cabby

New member
I've been trying to bleed the calipers on my cab today however the bleed nipple on the drivers side nearest the engine won't budge at all and is starting to round off.
Any suggestions how to remove it before it's completely knackered.
Also are the bleed nipples a standard caliper part ie am i likely to be able to get one from Halfords or any decent motor factors tomorrow or are they specialist ordered like the dust boots etc.
 
Use an eight point - not a 16 point - spanner. Clean around the base with a wire brush. Try a little easing oil on the corroded threads and leave for a while. Gently try to tighten, then untighten the screw - just a little at a time, but don't be too animal with it. If it starts to move, continue the process screwing, unscrewing and lubricating until it is free. Keep cleaning up the threads as you go.
If that doesn't work try a little heat with a hot air gun. If you lose the flats on the screw, take a file and reduce the hex down to the next spanner size and try again. Be patient and with luck it'll budge. [&o] If you're still not successful then you are in for a bit more work and it'll be brute force. The chances then are that you will damage the screw, which will result in having to drill it out and retap the caliper. Replacement screws should be availabe from your OPC. Good luck[:)]
Regards,
Clive
 
Remove the caliper from the car. Spray bleed nipple with WD40 (or penetrating oil), leave for a long as possible to allow it to work. Apply local heat with a blow torch. (The type plumbers use to solder joints etc.) I think Lancerlot meant a six sided spanner not a eight sided one. Best if you use a brake spanner, these are twice as deep as a standard spanner. Do not use undue force, gently Bentley.
Cheers,
 
first try a larger size ring spanner and wedge a drill into the gap so that as you turn the spanner the whole thing locks up and tightens the more you turn the tigher it grips. You'll have to jiggery about a bit with differant drills and ring spanner sizes
Too late ? ok only choice now is to use a miniature Stilsons nothing else will do .6" or 8" max
The jaws are toothed and the more you turn the harder it bites and grips. Whatever you do I wouldn't advise you being temped to use any type of grip wrench because it will chew further as you will not have sufficient hand strength to close the jaws tightly enough

Be very careful to apply pressure slowly and gradually and make sure all the pressure is rotational and not tangental. Don't heat too small waste of time it will probably shear off then you'l need a new caliper .
One alternative I have used as a tempoary measure You can crack open the brake hose next to the caliper and bleed from there.It will pi** everywhere and leave a little air in the system but it will work and get you home or to a garage safely .
 
Thanks guys,
I've left it covered in WD40 overnight and i'll have another go tomorrow in the light.
I think i'll try the small file route first as some of the flats are damaged unfortunately.Really frustrating when i've managed the others ok!
 
good luck.... I've never managed to file sucessfully myself. You start with something tiny and end up with something even tinier but now completly out of shape.
Everything you use now just slips because it is so small and you are completly out of options. Better to try the ring spanner and drill bit first if you intend to file anyway.
Best of luck
 
Thanks again guys,
Just managed to get the bugger off sufficient to bleed it with a six-point spanner, plenty of wd40 and a liberal amount of foul language [:)]- i'll order some new ones on monday as spares too!
 
Whilst on the subject of calipers - is the purpose of the dust boots covering each piston to protect the piston from damage or are they to retract the piston when you take your foot off the brake pedal?
 
ORIGINAL: 944cabby

Whilst on the subject of calipers - is the purpose of the dust boots covering each piston to protect the piston from damage or are they to retract the piston when you take your foot off the brake pedal?
Click to expand...
The dust boots are what they say. They are to protect the caliper piston from dirt etc attacking the finely machined surface of the piston. Hope this answers your question
 
ORIGINAL: Ian B Walker

Believe it or not but Coca Cola is a better release agent than WD40. Apply, allow to soak overnight and undo [;)]
Click to expand...

Personally I always find that makes it go flat and quite impossible to drink. :ROFLMAO:
Regards,
Clive
 
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