front right and rear left caliper are sticking

[UGOT8UP]

My front right and rear left caliper are sticking, I went today to order new calipers when I remembered reading something on here about our cars have diagonal proportioned brakes, so now I think I have a bad master cylinder or porporting valve, what do you guys think?

 

[dsmpat95]

That could be a good reason why. Also your brake flex lines like to cause your brakes to stick(drag) also. Just a little thought, because the age of your car.

 

[UGOT8UP]

Flex lines? the rubber lines that go to the calipers?

 

[dsmpat95]

Yea, when they go bad, they allow pressure to be applied. But when you let off they slowly return or stick.

Also your porportion valve is there if you lose use of one of your brakes. By letting the opposites work( better control while stoping).

 

[ilco187]

in other terms its called a collapsed brake line

 

[UGOT8UP]

But what are the odds of both lines collapsing at the same time though?

 

[UGOT8UP]

I'm sure part's are going to be needed, I'm waiting for somebody who has had this problem and resolved it before I start throwing part's at it, I think that the master cylinder is bad not releasing the fluid back into the resivor causing the 2 calipers to remain stuck, Master cylinder isn't but $150.

 

[toofast82]

When i had my 90', i had to replace the rear pads three times for 1 in the front. Also had a caliper lock as well. I dont know if there is anything that can be done in specific. Maybe a different proportioning valve? search this one out. I just tried to change the pads before the rotors got messed up and the pads had lifetime warranty.

 

[UGOT8UP]

It's realy bad!! like almost locked down, it's worse in the morning

search comes up with nothing on this

 

[ilco187]

you could take the caliper off and use a C-clamp to push the piston back into the bore to see if its not the caliper it self, i am sharing the same problem it just occurred and i am a little confused on this also, but its in my front left caliper, so for a temp solution i have mini vice grips clamping it off until i get my stainless lines and check the entire brake system

 

[UGOT8UP]

you could take the caliper off and use a C-clamp to push the piston back into the bore to see if its not the caliper it self, i am sharing the same problem it just occurred and i am a little confused on this also, but its in my front left caliper, so for a temp solution i have mini vice grips clamping it off until i get my stainless lines and check the entire brake system

That might not be the best of idea's...I got a new porporting valve coming in, if thats not it I'm going to change out the master cylinder.

 

[jdd1231]

Crack the bleeder on the caliper that appears to be sticking.If the caliper goes back freely with the bleeder cracked open,you know its not the caliper,then your looking at a collapsed hose.

You want to eliminate the most common,easy fixes first.

 

[jen_cairo]

That might not be the best of idea's...I got a new porporting valve coming in, if thats not it I'm going to change out the master cylinder.

Dont ask for advice and not use it buddy.. goodluck on changing every part of your brake system when its probably something simple..You should listen to people on here instead of assuming things..

 

[UGOT8UP]

Dont ask for advice and not use it buddy.. goodluck on changing every part of your brake system when its probably something simple..You should listen to people on here instead of assuming things..

Buy a clue buddie only advice I've gotten is check rubber lines, done! there not bad, yes the calipers release when bleeder is released. leaving one of 2 things porporting valve or master cylinder.

What are the chances of 2 caliper lines going out at the same time? much less the ones that share the same flow chart in the system? very very slim

And I'm not driving my car around with vice grips clamping my lines shut

 

[207Laser]

I had both rear lines rot out at the same time last week, 20 bucks in lines and a couple unions and she's back on the road until i get some money

 

[jdd1231]

Buy a clue buddie only advice I've gotten is check rubber lines, done! there not bad, yes the calipers release when bleeder is released. leaving one of 2 things porporting valve or master cylinder.

What are the chances of 2 caliper lines going out at the same time? much less the ones that share the same flow chart in the system? very very slim

And I'm not driving my car around with vice grips clamping my lines shut

So I'm assuming you mean proportioning valve?

Personally Ive never seen a Proportioning valve cause brakes to lock up......

 

[jen_cairo]

Buy a clue buddie only advice I've gotten is check rubber lines, done! there not bad, yes the calipers release when bleeder is released. leaving one of 2 things porporting valve or master cylinder.

What are the chances of 2 caliper lines going out at the same time? much less the ones that share the same flow chart in the system? very very slim

And I'm not driving my car around with vice grips clamping my lines shut

Who said to drive your car around with vice grips clamping my lines shut..??
Did you have some one look at the master cylinder while you punmped the breaks and look for any leaks? Or pump the breaks and start your car and the pedal should be easy to press down for about 2 and a half times then it should be hard, and while still pressing on it with force see if it starts going down and more..Thats really the only way to check the master and check valve...But I dont think your master has anything to do with your problem....

You should do your research because you said how its ''very very slim''to have 2 lines go out , how rare do you think it is to have a proportioning valve??

 

[delta448]

I really doubt it's the actual proportioning valve causing the problem. I would first check to see if the lines can be bled on all of the calipers. IMO the most likely problem is dirt/debris in a line or in the proportioning valve causing a blockage of fluid going towards the two brakes that are not functioning. That suspected block raises the pressure in the opposite circuit to offset the false increased pressure seen by the valve on the non-functional circuit.

 

[UGOT8UP]

proportioning valve fixed the problem I've never heard of one go bad before either until now, while I was at it I flushed out the old fluid.