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Sticking brakes

 
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  #1 (permalink)  
Old 10 Aug 2012, 12:01 pm
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Default Sticking brakes

Hi all
The miles per gallon has not been all that good.
It has since transpires that the front brakes are sticking on.
This is not all the time and is not the same pressure.
Some times they are that hot you can smell it in the cabin.
There seems to be no patern to it.
Short run less than two miles both fronts are steaming.
Then a longer run ten miles or more and you can touch the wheels and not even warm.
And all is well under braking in all conditions.
Has any one got any ideas master cylinder/anti lock block as I find it hard to beleave that both calipers are faulty.
Thanks
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Old 10 Aug 2012, 12:34 pm
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Default Re: Sticking brakes

i understand it only happens sometimes.. if it is always both front brakes at the same time i would ASSume there is some sort of debris in the master cylinder preventing it from releasing pressure.

is the fluid in the reservoir clean or dirty?

i would squeeze the pistons into the calipers with C-clamps to force more fluid back into the reservoir, and then suck out as much old fluid as possible from the reservoir. i would then reinstall the calipers, fill with new fluid, and bleed the brakes until nice clean fluid comes out the bleeders.

-a little effort on your part but pretty cheap to do as it's just buying fluid. good place to start? you might inspect the caliper slide pins, wire brush and re-grease them while you've got it apart.

just my 2

Last edited by rob342; 10 Aug 2012 at 12:36 pm.
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Old 10 Aug 2012, 01:07 pm
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Default Re: Sticking brakes

Thanks Rob all sounds quite easy.
I will enlist the help of the yongest as she is well used to helping on my other cars.
As the wife's car is under warranty I have never bleed the brakes on a car with anti lock brakes.
Am I right in thinking it is the same princeable as without anti lock system.
When I push the piston into the calipar with a G clamp with it retrackded would you then bleed the resoviour empty.
Then refit both with copper grease on pins an pads and reblead to flush the calipar.
And witch DOT fluid is needed as there will be some in the garage.
Intact no I will buy new as its been there a year or two.
Thanks
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Old 10 Aug 2012, 01:18 pm
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Default Re: Sticking brakes

Interceptor, first you suck out some of the brake fluid--before you "C clamp" the piston. Otherwise, you'll push out the fluid in the reservoir and spill it all over the place.

Also, you c-clamp the outer portions of the brake pads--not the piston, as the brake pads are in flat contact with the piston.

Even so, with this kind of problem, I would not look into this matter myself. It seems to me that your piston is sticking for some odd reason that I'd ask a brake shop to look into. What with the overheating and all, you may have damage to the pads also--as well as the disc.

Many shops will inspect your brakes for free.

Tim
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Old 10 Aug 2012, 01:21 pm
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Default Re: Sticking brakes

they usually recommend opening the bleeder on ABS equipped cars before compressing the caliper to avoid damaging the ABS block but i think it would be better not to in your situation.

when i do my brakes i have never opened the bleeders before compressing calipers(because i'm lazy) and i have never had an issue from it.

and NO i didn't mean to bleed it empty. just suck out as much dirty fluid as possible with it squeezed, and then refill it before bleeding. getting air in the ABS stuff might cause you a headache trying to get the air out of the abs box

Last edited by rob342; 10 Aug 2012 at 01:44 pm.
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Old 10 Aug 2012, 01:39 pm
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Default Re: Sticking brakes

Quote:
Originally Posted by mdfrodolives View Post
Interceptor, first you suck out some of the brake fluid--before you "C clamp" the piston. Otherwise, you'll push out the fluid in the reservoir and spill it all over the place.
Tim
good call!

Quote:
Originally Posted by mdfrodolives View Post
It seems to me that your piston is sticking for some odd reason
Tim
just curious.. wouldn't that make the pedal stick down/sit lower?
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Old 10 Aug 2012, 04:19 pm
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Default Re: Sticking brakes

Well, something is making his brake pads continue to pinch the discs after he's let off the brake pedal. I have no idea what it could be, so I said for him to take it to a brake shop--and not try to deal with it himself.

Tim
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Old 10 Aug 2012, 05:23 pm
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Default Re: Sticking brakes

the calipers are pretty cheap id just replace them the lines can also cause the brakes to stick if the inside getts all deteratoed and would alll the fluid to return so to me id think about the calipers and maybe the lines the rets is pretty much a given
OH make sure you greese the PINS on the calipers they can also cause sticking
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Old 10 Aug 2012, 05:25 pm
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Default Re: Sticking brakes

Quote:
Originally Posted by mdfrodolives View Post
Interceptor, first you suck out some of the brake fluid--before you "C clamp" the piston. Otherwise, you'll push out the fluid in the reservoir and spill it all over the place.

Also, you c-clamp the outer portions of the brake pads--not the piston, as the brake pads are in flat contact with the piston.

Even so, with this kind of problem, I would not look into this matter myself. It seems to me that your piston is sticking for some odd reason that I'd ask a brake shop to look into. What with the overheating and all, you may have damage to the pads also--as well as the disc.

Many shops will inspect your brakes for free.

Tim

Tim
Im not questioning you BUT the amount of fluid is the same in the closed system so in reality the resivor should be a tad bit lower as the pads wear down
I never let any fluid out when i compress the piston as really the fluid levr should never change????

PS I could be all wrong im just saying
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Old 10 Aug 2012, 05:49 pm
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Default Re: Sticking brakes

Quote:
Originally Posted by cruserdad1976 View Post
Tim
Im not questioning you BUT the amount of fluid is the same in the closed system so in reality the resivor should be a tad bit lower as the pads wear down
I never let any fluid out when i compress the piston as really the fluid levr should never change????

PS I could be all wrong im just saying
yes, you are right. If the fluid is low then the pads and shoes are worn out. If the system is not leaking. collapse the calipers and wheel cylinders and install new pads and shoes and the resivor is full again. Should never need to add fluid if system is not leaking.
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