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Author Topic: Wanted: Murena rear brake caliber (2.2)  (Read 3068 times)
krede
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« on: July 20, 2011, 07:14:21 pm »

I had the venting screw in one of mine , and as it turns out it's a total Loss. Thought i'd ask if anybody has a spare, before I go out and buy a brand new one.
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JL
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« Reply #1 on: July 20, 2011, 10:04:38 pm »

What is the problem?

John
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krede
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« Reply #2 on: July 20, 2011, 10:18:26 pm »

The bleed screw broke off and I had to drill it out which ruined the calibre
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RazorbackNOR
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« Reply #3 on: July 20, 2011, 11:55:00 pm »

Wouldn't help welding the hole and redrilling it?
How did you manage to ruin it so bad?
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2010 Mazda 3 1,6  Diesel Gunmetal Blue
1983 Matra Murena 2.2 Platine
50cc Pocketbike
IPSC shooter
lewisman
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« Reply #4 on: July 21, 2011, 01:59:49 am »

You should be able to machine it to accept a larger bleed nipple.
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krede
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« Reply #5 on: July 21, 2011, 06:25:00 am »

I had a go at that... and after that a talk with a specialist brake shop, and they said it couldn't be done
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JL
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« Reply #6 on: July 21, 2011, 07:25:40 pm »

Any chance of a photograph?

Regards
John
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krede
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« Reply #7 on: July 21, 2011, 07:33:55 pm »

I have fitted a heli coil to it, so the old bleed screw might still be used. My problem is, that after drilling out the old bleed srew, the venting hole into the calibre is no longer in the centre of the hole where the bleed screw goes, so It might not seal properly... I'll give it a go to see if it works out, but the screw has to be really tight to seal. 
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JL
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« Reply #8 on: July 21, 2011, 09:10:06 pm »

If you can find a centering tool the same size as the internal thread diameter you should be able to centre the bottom of the bleed screw housing:

http://www.rdgtools.co.uk/acatalog/Centre_Drills.html

Regards
John
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lewisman
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« Reply #9 on: July 22, 2011, 11:39:09 pm »

I am not sure that I should even mention this but we are talking rear calipers...

Back in the student days when money was a lot tighter, I had an old Renault 6. The front caliper was sticking so I took it apart (it was a sliding, single piston caliper with wedges - similar to the rear ones on a Murena without the handbrake).  When I tried to bleed the brakes one of the bleed nipples sheared off. I managed to drill the old nipple out but had to go up a size as the thread was damaged and it simply would not seal.

I had no access to any sort of machine shop and a new caliper would be a back order of at least two weeks (and cost more than the car was worth).

Solution - cut and file the end of the new bleed nipple so that it was shorter and square. Drop in a small ball bearing.  Worked a treat. Perfect seal when tight. Bled as normal when required.

I did replace it with a second hand caliper but I only did it because the piston was not great - not because of any leaks.
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