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brakes; brakes locking up
Topic Started: Nov 25 2010, 08:04 PM (955 Views)
stangguy
Fresh Fish
[ * ]
i have a 1996 metro that the brakes lock up on intermitantly. I have replaced the calipers, lines,vaccum booster,master cylinder,poportioning valve,pads and rotors. And the problem still exist has anyone else had this problem and does any know how to fix it
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bennie442


Haven you checked that the caliper sliders aren't binding?
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Johnny Mullet
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Fear the Mullet

I agree. The caliper slide pins could be frozen or maybe the pads are stuck in the perches needing cleaned and lubed up.
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nerys
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Grr

also check your tires. if there not the greatest a little slick or out of alignment so less rubber touches the road they could "simply" be locking up. IE the friction of the brakes being greater than the friction of tire to road.

I noticed many times during "hard" stops my brakes will lock up for a second and I slide when my front tires hit "painted lines" since they are more slippery.
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mwebb
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FOG

hard to say
i use an infared temp probe to squirt the rotors through the openings in the wheels to see which brake is locking up
is it one
or two or

all four

you can use the BACK of your fingers on a suspected wheel after enough driving to heat up the offending rotor / drum
temperature can exceed 300f . which will remove fingerprints . quickly .

i have found the problems to be mostly related to;

pads frozen in the pad mounting area due to rust
frozen brake caliper slides
brake hoses the let fluid pass under pressure but not return to the master cylinder
a single frozen cylinder in a wheel cylinder

or
improperly adjusted linkage between brake pedal / booster and master cylinder
oil / water in the brake fluid

in descending order of probability
===================================
the NEW parts that you replaced may be defective
NEW means
Never Ever Worked .
Edited by mwebb, Nov 25 2010, 11:58 PM.
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nerys
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Grr

hehe I like that NEW Never Ever Worked :-)
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JellyBeanDriver


stangguy
Nov 25 2010, 08:04 PM
i have a 1996 metro that the brakes lock up on intermitantly. I have replaced the calipers, lines,vaccum booster,master cylinder,poportioning valve,pads and rotors. And the problem still exist has anyone else had this problem and does any know how to fix it
Define ' locking up'. Under what circumstances?
Edited by JellyBeanDriver, Nov 26 2010, 10:10 AM.
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nerys
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Grr

hmmm good point JBD to me locking up is literally locking up. wheels stop turning your "sliding" or "skidding"

I guess it would be good to know what he means by locking up :-)
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