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Brake dramas

Got a quick question regarding brakes. My brothers car stuffed up and now the brakes lock after using the car for a while. I pulled the calipers down last night and everything seems to be working fine (good seals, and dust boot and no dirt).Flushed the brakes and took it for a drive. Goes good for a while and then started shuddering a little. Stopped for a look (parked on a hill) and the car won't roll. Give it a push and the brakes are stuck on. Waied about 5 minutes and it was much easier to push so the brakes had backed off. Happening to both front and rear so I am thinking master cylinder?? Anyone had or heard of this problem before??

Thanks for any advice cause my brother really needs his car back on the road.
Disc / drum.

Adam.

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Only guessing, but I would think either the master cylinder, or check out the brake booster, maybe it's holding the pressure on, and taking a few minutes to lose pressure?
Food for thought anyway.

Cheers
Bruno

**Edit**
PS. was thinking, if you remove the vacuum hose to the booster, (so the booster is not working), then try the brakes, and see if they stay on. If they don't stay on, it's the booster causing it, if they do, then it could be the pushrod sticking, or something with the master cylinder.

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Growing old is unavoidable, growing up is optional ;)

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Sounds good to me.

I will have a look at the pushrod to check for jamming and try the booster while disconnected in case it is holding pressure. I did quick test the booster (hold pedal down with car off and then start) and the pedal went down further so I am assumung it is working. Will let you know how I go.

Any other ideas before I go home (don't have internet access at home unfortunately)???

Cheers,

Adam.

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oo

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HAVE you changed or reco the master cylinder.???
the piston in the master cylinder sounds as thou it is not returning fully and is blocking the return ports in the master cylinder or the rubber seals in the master cylinder have swelled ,or the spring at the end of the piston assembly in the master cylinder has broken .. if it was only the front brakes and the master cylinder had been changed i would say the rubber check valve was still in the front brake line for drum brakes as disc brakes must have this valve removed otherwise the brakes stay on with disc brakes..

wombat.

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No changes to the master cylinder but my brother did mention that he MAY have accidentally put transmission fluid in ages ago (could this cause swelling seals???). We flushed the whole system when we pulled the front calipers down though.

Had another play around last night and found it made no difference to the locking up if the booster was connected or disconnected or car running or not (strange how it takes about 5 minutes of driving to start happening). The pedal and rod into the booster seem fine but I didn't take the master cylinder off to check if the pushrod from the booster to the master was working properly cause I read in my manual that you are not supposed to push the brake pedal in with the master cylinder removed. (any truth to this if I am gentle).

I think I will try removing the master from the booster as snow suggested to see if it is the booster thats causing it.

Adam (forgot to log in

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oo

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I had the same problem with my Morris Minor. Turned out the brake fluid had turned to like vaseline and had to flush the whole system about 4 times, but still never got it working properly. Don't know what caused it.

johnperth

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yes the trans oil will certainly swell ALL THE RUBBERS IN THE SYSTEM , the master cylinder , the front calipers and the rear wheel cylinders. and they will perish..

wombat...

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