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Phil Greg
I have a ford focus 1.8 with rear disk brakes. At low speeds I get a rotational rubbing/thumping sound that seems to come from the rear, can't tell which side. This speeds up as the car does. Sometimes it goes away. I have replaced the discs and pads but no difference. There is no play in the bearing I can detect and when I rotate wheel by hand no tight spots. I suspect it could be caused by handbreak not releasing properly or the caliper piston being stuck. Could this be a bearing? What else could it be?

Thanks for any help
stef123
[quote name='Phil Greg' date='06 June 2010 - 04:56 PM' timestamp='1275839188' post='84311']
I have a ford focus 1.8 with rear disk brakes. At low speeds I get a rotational rubbing/thumping sound that seems to come from the rear, can't tell which side. This speeds up as the car does. Sometimes it goes away. I have replaced the discs and pads but no difference. There is no play in the bearing I can detect and when I rotate wheel by hand no tight spots. I suspect it could be caused by handbreak not releasing properly or the caliper piston being stuck. Could this be a bearing? What else could it be?

Thanks for any help
[/quote]

sounds to me like you have a seized caliper? could also be the handbrake not releasing properly. did you lubricate the sliding pins on the calipers when you changed the discs/pads?
Phil Greg
[quote name='stef123' date='06 June 2010 - 05:00 PM' timestamp='1275839459' post='84313']
sounds to me like you have a seized caliper? could also be the handbrake not releasing properly. did you lubricate the sliding pins on the calipers when you changed the discs/pads?
[/quote]
I'm begining to think that could be it, one of the pistons was quite hard to screw back in. The sliders seemed ok. What could stop the hand break from releasing? Is there anything that can be done to unseize the caliper?
stef123
[quote name='Phil Greg' date='06 June 2010 - 05:05 PM' timestamp='1275839757' post='84315']
I'm begining to think that could be it, one of the pistons was quite hard to screw back in. The sliders seemed ok. What could stop the hand break from releasing? Is there anything that can be done to unseize the caliper?
[/quote]

if it was hard to screw back in that could indicate a seized handbrake mechanism inside as thats what your rewinding.
i think the only way to unseize the caliper would be to strip and rebuild it or replace it with a second hand one or recon one.
Phil Greg
[quote name='stef123' date='06 June 2010 - 10:28 PM' timestamp='1275859125' post='84368']
if it was hard to screw back in that could indicate a seized handbrake mechanism inside as thats what your rewinding.
i think the only way to unseize the caliper would be to strip and rebuild it or replace it with a second hand one or recon one.
[/quote]
Thanks

I'll look into it and let you know when I've found out.


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