DJT
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| posted on 6/7/16 at 02:06 PM |
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Which Sierra rear wheel cylinder?
After the recent trip to the Black Forest (lots of braking!) I've got a mushy brake pedal. I've bled the system a number of times and
it's still not quite right. I noticed that there is some noise from one of the wheel cylinders when I press the brake pedal in a quiet garage.
I'm suspecting that the wheel cylinder is failing internally. I want to replace it as they are cheap and an easy swap. However, there seems to
be two variants: Bore/piston diameter of 22.2mm or 20.64mm.
I've got the Sierra 9" drums fitted. The wheels cylinders I originally fitted have QH part number BWC3485, which translates to an
Escort/Orion fitment, so that is a bit misleading, but they work! Doea anybody know the correct wheel cylinders that should be fitted for my 9"
drum brakes?
Many thanks,
David.
http://tigeravonbuilddiary.blogspot.com/
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britishtrident
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| posted on 6/7/16 at 03:17 PM |
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Wheel cylinders can't make a noise, pull the drum off and you will find something is detached in side the drum, possibly the spring on the
self-adjuster mecanism or a shoe hold down spring.
The reason why Escort Mk3 wheel cylinders were fitted is to adjust the front rear brake bias to prevent rear wheel locking.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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DJT
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| posted on 6/7/16 at 09:58 PM |
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Thanks Trident.
Took the drums off. Everything looks in order. Perhaps its the master cylinder on its way out.
http://tigeravonbuilddiary.blogspot.com/
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britishtrident
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| posted on 7/7/16 at 06:54 AM |
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If when press and release the brake pedal you get a creaking noise from the rear brake and excess pedal travel it points to the self-adjuster on that
wheel. The noise is made by the adjuster ratchet taking up travel when the pedal is pushed but slipping back when the pedal is released.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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907
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| posted on 7/7/16 at 07:05 AM |
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I fitted the Sierra ones for IVA and failed.
Fitted Ford Festa ones and passed.
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DJT
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| posted on 7/7/16 at 11:28 AM |
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I've got a Fiesta pressure reducing valve and that worked fine for IVA.
I think the noise from testing the brakes is a red-herring. I've since noticed that the pedal has some slack in it before it has resistance,
i.e. the push rod now moves in a few mm before contacting the piston. It was not like this before, so has got me thinking it is a master cylinder
issue. Will try one more bleed before I swap any bits.
http://tigeravonbuilddiary.blogspot.com/
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