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Old 07-08-2012, 08:42 AM   #11 (permalink)
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Default Re: brakes locking up while driving???

Moisture does not cause this symptom. Moisture causes a low to no pedal when the moisture turns to vapor when hot.

HOWEVER the moisture does cause some terrible corrosion problems in the system. The fact that your piston didnt return all the way was the real cause of your brake lockup.

I had not encountered problems like these in my years of wrenching either until the last few years. I think new formulas for fluid and rubber brake parts have combined to cause all new problems for us.

Keeping fresh fluid in the system is the best bet for reliability.

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Old 07-10-2012, 01:06 PM   #12 (permalink)
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Default Re: brakes locking up while driving???

I totally agree seedy25. My problem was the MC and dirty fluid. I guess what I was trying to get at was the H2O is lowering the boiling point of the fluid. The MC was not allowing the fluid to return, and in affect "locking" the fluid in place. However when the fluid was heated by the friction of the now "stuck" brake pads, it is, I am assuming, expanding the fluid at a faster rate than just fluid alone. Hope that is making sense.
Anyway, thanks for the input.
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Old 07-11-2012, 03:26 AM   #13 (permalink)
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Default Re: brakes locking up while driving???

When the system heats up the fluid expands. There is a small hole in the MC called a compensation port. This port is the one that squirts brake fluid all over your car if you dont put the cap on when you are brake bleeding. If the hole is plugged or covered no fluid can flow back into the MC and the brakes lock up.

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Old 08-12-2019, 06:01 PM   #14 (permalink)
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Default Re: brakes locking up while driving???

Quote:
Originally Posted by craneop2009 View Post
yea i checked the brake lines they r free i have do full brake flushes every year. my fluid looks as if its band new. what i did find tho is that i can relieve the pressure at the master cylinder on the front brake line and it releases both the driver fron and rear passenger brakes. the other two work just fine lol?!? anyways i ordered another master cylinder thinking that it has to be that? i put on a used one on new to me but used. it will be here in the morning so hopefully this solves my problem. its crazy that the brake line on the side of the master cylinder runs the passenger front and rear driver brakes and the front brake line runs the driver front and rear passenger brakes but thats the way it works on my car lol!! i also took ront brake line off of master cylinder and compressed both front and rear calipers and the fluid came out in a steady stream. i then put the front brake line back on the master cylinder and beld brakes then pumped up the brakes and they stuck again so it has to be that stupid master cylinder?? dont know what else it could be
Hi craneop2009,
Did you ever get your brake problem solved? Did you replace the master cylinder and did that fix your brake lockup problem? I am having the same problem with my left front brake on my 1992 Mitsubishi 3000GT VR4. I have already replaced the hydraulic unit (HU) and the proportioning valve, and brand new front Brembo Grand Turismo brake kits on both sides of the car. Pulled the ABS fuse, and this did not help either. All other brakes on my car work perfectly. It's just the left front brake that is locking up. Any advice will be much appreciated!
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Old 08-13-2019, 04:23 PM   #15 (permalink)
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Default Re: brakes locking up while driving???

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Originally Posted by gokart View Post
Hi craneop2009,
Did you ever get your brake problem solved? Did you replace the master cylinder and did that fix your brake lockup problem? I am having the same problem with my left front brake on my 1992 Mitsubishi 3000GT VR4. I have already replaced the hydraulic unit (HU) and the proportioning valve, and brand new front Brembo Grand Turismo brake kits on both sides of the car. Pulled the ABS fuse, and this did not help either. All other brakes on my car work perfectly. It's just the left front brake that is locking up. Any advice will be much appreciated!
It's the master cylinder... It's always the master cylinder. If you look hard enough, you'll probably find at least 20 threads on this site for the same thing.
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