4 pot conversion problems
07 March 2009, 12:37 PM
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4 pot conversion problems
hi all, been helping a friend upgrade to 4 pots but they have turned out to be pants compared to the standard 2 pots.
they've been bled 3 times now and the pedal still feels spungie, they are new discs and new pads.
its on a 98 uk turbo, any ideas what could be wrong cos its got me baffled now
they've been bled 3 times now and the pedal still feels spungie, they are new discs and new pads.
its on a 98 uk turbo, any ideas what could be wrong cos its got me baffled now
07 March 2009, 12:48 PM
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Something is defo wrong as have done the same conversion twice and the 4 pots are a good deal better than the 2 pots, once bedded in.
Not being funny but, have you got the calipers on the correct sides, ie. bleed nipples at the top? It's been done before and will result in soft pedal as there is still air in the calipers.
Not being funny but, have you got the calipers on the correct sides, ie. bleed nipples at the top? It's been done before and will result in soft pedal as there is still air in the calipers.
07 March 2009, 01:00 PM
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How are you bleeding then?
Did you start with rear brakes first?
How much fluid did you lose when changing the calipers? and I am assuming that it is a standard UK MY98 with ABS?
Did you start with rear brakes first?
How much fluid did you lose when changing the calipers? and I am assuming that it is a standard UK MY98 with ABS?
07 March 2009, 01:18 PM
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the car was taken to a garage on thursday to be bled again and it came back just the same.
got the manual for the car and we've bled the brakes in the order the book says(front right, rear left, front left rear right).
and standard car with abs.
got the manual for the car and we've bled the brakes in the order the book says(front right, rear left, front left rear right).
and standard car with abs.
07 March 2009, 02:54 PM
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Oh, if a garage can't get it right then you have problems!!!!
In my experience of problems occurring after a change it is usually best to undo the change and try again. ie. refit the 2 pot calipers and then see if you can bleed the system then. That way you will know if the calipers are the problem or not. Unlikely I know but think it may be the best way to go in this situation
In my experience of problems occurring after a change it is usually best to undo the change and try again. ie. refit the 2 pot calipers and then see if you can bleed the system then. That way you will know if the calipers are the problem or not. Unlikely I know but think it may be the best way to go in this situation
Last edited by his-n-her-scoobs; 07 March 2009 at 02:56 PM.
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08 March 2009, 06:52 PM
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hey tony, cheers for all the ideas mate.
my mate who owns the car has bled them all again but slowly this time and seems to think it feels alot better, so still waitin to find the out come of that as yet.
just need to sort the problem out with my own motor now lol.
the joys of motoring ehh lol.
my mate who owns the car has bled them all again but slowly this time and seems to think it feels alot better, so still waitin to find the out come of that as yet.
just need to sort the problem out with my own motor now lol.
the joys of motoring ehh lol.
10 March 2009, 08:04 PM
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lukey
yup straight swap bolt on (wheel/caliper clearance issue though)
tomo72
were the brakes pressure bled or pedal pumped?
i have had in the past on other cars issue with master cylinder seal going after bled by pumping brake pedal, if its pretty old may be needing replacement.
yup straight swap bolt on (wheel/caliper clearance issue though)
tomo72
were the brakes pressure bled or pedal pumped?
i have had in the past on other cars issue with master cylinder seal going after bled by pumping brake pedal, if its pretty old may be needing replacement.
11 March 2009, 12:36 AM
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tomo you tried pumping the pedal so its hard and keep pressure on pedal see if it loses any pressure and pedal drops? (engine off)
its just this reminds me exactly of my old mk1 rs 2000 when i changed to 4 pots and pumping the pedal nearly full travel in the master cylinder damaged the seal and fluid was escaping past causing that spongy feel.
you do get a spongy feel from new pads/discs sometimes for a few miles til they bed in if you keep eye on fluid lvl and run it then see how they feel taking things steady obviously
its just this reminds me exactly of my old mk1 rs 2000 when i changed to 4 pots and pumping the pedal nearly full travel in the master cylinder damaged the seal and fluid was escaping past causing that spongy feel.
you do get a spongy feel from new pads/discs sometimes for a few miles til they bed in if you keep eye on fluid lvl and run it then see how they feel taking things steady obviously
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