Calipers Are Seized? My Car Keeps On Locking All 4 Wheels....
07-06-07, 05:42 PM
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Calipers Are Seized? My Car Keeps On Locking All 4 Wheels....
SINCE I CHANGED MY CALIPERS, BRAKE PADS AND ROTORS(3WEEKSAGO) I VE HAD PROBLEMS WITH MY BRAKES...
when i start my car up everything is fine but after driving for about 15-20 minutes i can feel that calipers are slowly not opening as much .
basically all 4 wheels lock slowly...
my mechanic tried bleeding brakes which helped for about a day and now its back to 4 wheels being locked...
do i have pressure problems?
did anyone experience this brake problem?
where should i look for help? i dont really want to go to lexus...
abs light is not on.
btw when car sits over night (cold) everything seems ok next morning..all calipers unlock.. then i drive for 15-20 min and same thing happens....
someone give me some advice..how should we approach this problem
master brake cilinder?? maybe?
bad or twisted or pinched brake line? i dont think thats the case...
when i start my car up everything is fine but after driving for about 15-20 minutes i can feel that calipers are slowly not opening as much .
basically all 4 wheels lock slowly...
my mechanic tried bleeding brakes which helped for about a day and now its back to 4 wheels being locked...
do i have pressure problems?
did anyone experience this brake problem?
where should i look for help? i dont really want to go to lexus...
abs light is not on.
btw when car sits over night (cold) everything seems ok next morning..all calipers unlock.. then i drive for 15-20 min and same thing happens....
someone give me some advice..how should we approach this problem
master brake cilinder?? maybe?
bad or twisted or pinched brake line? i dont think thats the case...
Last edited by LEXuriouss; 07-06-07 at 06:21 PM.
07-06-07, 07:12 PM
#2
restriction in a line somewhere... master cylinder will not cause this unless it's not retracting at all...
given that the calipers are all new, it's not a caliper problem, as bleeding them fixes it...
only thing it can really be is an obstruction or a kinked line.... brake pedal pressure exceeds 1000psi, so it will easily bypass almost any obstruction, whereas the seal in the caliper is the only thing responsible for retracting the pad, and it has to push fluid backwards - only a few psi pressure - that few psi may not bypass an obstruction or a kinked line like the 1000+ psi generated when you press the pedal... I assume the pedal feels normal?
given that the calipers are all new, it's not a caliper problem, as bleeding them fixes it...
only thing it can really be is an obstruction or a kinked line.... brake pedal pressure exceeds 1000psi, so it will easily bypass almost any obstruction, whereas the seal in the caliper is the only thing responsible for retracting the pad, and it has to push fluid backwards - only a few psi pressure - that few psi may not bypass an obstruction or a kinked line like the 1000+ psi generated when you press the pedal... I assume the pedal feels normal?
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07-07-07, 11:39 AM
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no real reason for changing the calipers , discs or the pads-- preventative maintenance...and now i got a real problemmmmmm
convoy: stock but all brand new
rotors slotted
convoy: stock but all brand new
rotors slotted
Last edited by LEXuriouss; 07-08-07 at 11:09 AM.
07-12-07, 04:10 PM
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after 2 long days my car s diagnose is: master cilinder is to be replaced.
it took 2 master mechanics to figure that out- supposely sc's with trac control are harder to work om or diagnose the problems.
.. so now my car is stuck at the lexus for the next 2 weeks-- they are just ordering the parts from US.
it took 2 master mechanics to figure that out- supposely sc's with trac control are harder to work om or diagnose the problems.
.. so now my car is stuck at the lexus for the next 2 weeks-- they are just ordering the parts from US.
07-12-07, 06:56 PM
#12
after 2 long days my car s diagnose is: master cilinder is to be replaced.
it took 2 master mechanics to figure that out- supposely sc's with trac control are harder to work om or diagnose the problems.
.. so now my car is stuck at the lexus for the next 2 weeks-- they are just ordering the parts from US.
it took 2 master mechanics to figure that out- supposely sc's with trac control are harder to work om or diagnose the problems.
.. so now my car is stuck at the lexus for the next 2 weeks-- they are just ordering the parts from US.
07-13-07, 07:53 AM
#14
most definitely... if the master cylinder is pushed too far forward, the seal will rub up against an area it's not used to being up against that may not be as smooth, also, bottoming it out can damage the seals inside as well... under normal braking, you can't physically push the cylinder in that far, but when bleeding brakes, you can push the pedal all the way to the floor, potentially damaging it... our guys at the shop here put a 2x4 underneath the brake pedal to prevent this from happening....
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