Zaphod
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 posted on 19/7/07 at 11:26 AM |
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Sierra master cylinder... Strange fenomenon
Hi All
I have a pretty strange problem with my master cylinder.
During bleeding of the front brakes I have a pedal travel/movement of about 4 cm, when I tighten the front nipples the pedal stops half way (2 cm
travel) with a metallic sound and cant be pushed any further.
I removed the MC yesterday and "bench bleed" it with no problems. Put it back on the car and the same fenomenon occured again?!?!?
Any suggestions?
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RazMan
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| posted on 19/7/07 at 11:42 AM |
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Sounds like the back pressure is jamming the piston somehow, assuming the noise is coming from the m/c of course. Have you stripped it to inspect for
wear?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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adithorp
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| posted on 19/7/07 at 11:43 AM |
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Air in the rear brakes.
Adrian
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Zaphod
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| posted on 19/7/07 at 12:25 PM |
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No, not stripped it. And yes the "Clonk" is coming from the MC.
If I loosen one of the nipples in front I can compress the MC without problems. As soon as there is preassure the half way "Clonk and dead
stop" appears.
Would trapped air in the rear casuse this?
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NS Dev
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| posted on 19/7/07 at 12:28 PM |
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quote:
Originally posted by adithorp
Air in the rear brakes.
Adrian
yep, exactly right, bleed the rears and it will go away.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Zaphod
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| posted on 19/7/07 at 12:56 PM |
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Hm, must be a airpocket in the rear...
maybe removing the rear calipers and shaking them around would do the trick?
Thx.
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RazMan
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| posted on 19/7/07 at 01:27 PM |
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Shaking them won't work - just make sure the bleed nipples are facing upwards while bleeding.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Avoneer
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| posted on 19/7/07 at 04:19 PM |
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Yeah - don't shake.
Any air bubbles you have will break up into tiny air bubbles in the fluid.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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