BRAKES : please help before i give up!
11 December 2005, 12:59 PM
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BRAKES : please help before i give up!
having just fit a newradiator to my impreza i went for a short road test, now the car is of the road but is moved daily, things were fine then after about 4 miles thre brakes started sticking on, they gradually got worse until it was barely driveable! i managed to get home, it has recantly had pads all round so i know they are ok, free sliders etc etc, even thoug there cooked now!!!!
i thought they were sticking last time i went out aswell, though not as bad! i have had the calipers off the car to paint them, but they bled up fine, when you undone the caliper, you can push the piston back ok with grips, so you would say the calipers are ok! help someone please!!!! i am about to get shut!
i thought they were sticking last time i went out aswell, though not as bad! i have had the calipers off the car to paint them, but they bled up fine, when you undone the caliper, you can push the piston back ok with grips, so you would say the calipers are ok! help someone please!!!! i am about to get shut!
11 December 2005, 04:48 PM
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If you jack it up do all of the wheels turn freely when the brakes are cold?
If not then do three turn OK and one sticky? Or are both fronts or rears or all four sticky?
If they're OK cold then when they're hot is it just one, a pair or all four that are overheating? You should be able to tell without jacking it up, the discs will be really hot, smoking a bit, blue colour, glowing red (!) depending on how bad they are.
One likely to be sticky caliper piston, too thick pads or similar. Fronts or rears likely to be master cylinder problem, handbrake too tight (or you left it on....) or similar. All four..... errr, major master cylinder fault, pedal pivot seized..... clutching at straws now.
Reading your original mail again, when you say you can push pistons back with grips then I trust you don't mean you've used pliers or mole grips to hold the bit of piston sticking out? If so then a risk you've damaged the surface of the piston which needs to be dead smooth as it fits in a very tight bore in the caliper. Any damage could lead to it sticking in the caliper bore or the seals. You should only push pistons back by using a lever to push against the end of the piston or against the outside of the pad not the outer diameter of the piston. Apologies if you haven't done this, not implying your mechanically inept but that's what it reads like....
If not then do three turn OK and one sticky? Or are both fronts or rears or all four sticky?
If they're OK cold then when they're hot is it just one, a pair or all four that are overheating? You should be able to tell without jacking it up, the discs will be really hot, smoking a bit, blue colour, glowing red (!) depending on how bad they are.
One likely to be sticky caliper piston, too thick pads or similar. Fronts or rears likely to be master cylinder problem, handbrake too tight (or you left it on....) or similar. All four..... errr, major master cylinder fault, pedal pivot seized..... clutching at straws now.
Reading your original mail again, when you say you can push pistons back with grips then I trust you don't mean you've used pliers or mole grips to hold the bit of piston sticking out? If so then a risk you've damaged the surface of the piston which needs to be dead smooth as it fits in a very tight bore in the caliper. Any damage could lead to it sticking in the caliper bore or the seals. You should only push pistons back by using a lever to push against the end of the piston or against the outside of the pad not the outer diameter of the piston. Apologies if you haven't done this, not implying your mechanically inept but that's what it reads like....
Last edited by Chelspeed; 11 December 2005 at 04:53 PM.
11 December 2005, 05:23 PM
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Originally Posted by Chelspeed
If you jack it up do all of the wheels turn freely when the brakes are cold?
If not then do three turn OK and one sticky? Or are both fronts or rears or all four sticky?
If they're OK cold then when they're hot is it just one, a pair or all four that are overheating? You should be able to tell without jacking it up, the discs will be really hot, smoking a bit, blue colour, glowing red (!) depending on how bad they are.
One likely to be sticky caliper piston, too thick pads or similar. Fronts or rears likely to be master cylinder problem, handbrake too tight (or you left it on....) or similar. All four..... errr, major master cylinder fault, pedal pivot seized..... clutching at straws now.
Reading your original mail again, when you say you can push pistons back with grips then I trust you don't mean you've used pliers or mole grips to hold the bit of piston sticking out? If so then a risk you've damaged the surface of the piston which needs to be dead smooth as it fits in a very tight bore in the caliper. Any damage could lead to it sticking in the caliper bore or the seals. You should only push pistons back by using a lever to push against the end of the piston or against the outside of the pad not the outer diameter of the piston. Apologies if you haven't done this, not implying your mechanically inept but that's what it reads like....
If not then do three turn OK and one sticky? Or are both fronts or rears or all four sticky?
If they're OK cold then when they're hot is it just one, a pair or all four that are overheating? You should be able to tell without jacking it up, the discs will be really hot, smoking a bit, blue colour, glowing red (!) depending on how bad they are.
One likely to be sticky caliper piston, too thick pads or similar. Fronts or rears likely to be master cylinder problem, handbrake too tight (or you left it on....) or similar. All four..... errr, major master cylinder fault, pedal pivot seized..... clutching at straws now.
Reading your original mail again, when you say you can push pistons back with grips then I trust you don't mean you've used pliers or mole grips to hold the bit of piston sticking out? If so then a risk you've damaged the surface of the piston which needs to be dead smooth as it fits in a very tight bore in the caliper. Any damage could lead to it sticking in the caliper bore or the seals. You should only push pistons back by using a lever to push against the end of the piston or against the outside of the pad not the outer diameter of the piston. Apologies if you haven't done this, not implying your mechanically inept but that's what it reads like....
11 December 2005, 05:27 PM
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to thick pads....... is this possible? its only since the new pads were fit!? they are identical and when the pistons are all the way back the caliper shuts no problems at all.
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12 December 2005, 09:19 AM
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there maybe a bit of debris in the system that could be blocking the pipe , seen this before , you can usually see if its this by pressing hard on the brake a few times , with the brake pedal off , open a bleed nipple and see if the fluid shoots out , if it does then its still under pressure
17 December 2005, 05:00 PM
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Originally Posted by Dyney
You've had the calipers off to paint them?
Did you refit them with the bleed nipples at the top? (I know too many people that have got this wrong)
Did you refit them with the bleed nipples at the top? (I know too many people that have got this wrong)
got new seal kits big thanks to ALYN at A.S.Performance!got some black diamond braded hoses coming off flleebay, take 2 i think! cheers dudes!!
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