Question about 1985 Honda Accord

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Brake lock-up 1985 honda accord brakes lock-up when hot. Already replaced master cylinder (new)/ power booster (used)/ proportioning valve (used)/ calipers (reman.)/ flushed & bled system.

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I suspect that you have front disc and rear drum brakes.You did not say which of your brakes are locking up. I suggest that if your front brakes are locking {skid} that means your rear brakes are not engaging. If your rear brakes are locking {skid} then I suggest you have problems with park brake or brake fluid leaking onto the rear shoes.
More info would help me help you. I will check back soon.

Posted on May 21, 2009

  • Mild0802 Jun 22, 2011

    what do i need to do to make the front brakes engaged?

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there is a proportioning valve to the rear brakes that only allows them to operate fully under load or heavy braking. If it is faulty then full brakes will be applied to the rear which will allow them to lock up first.
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Master Cylinder (Brake System) :
Worn or leaking brake master cylinder.
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plz rate this post

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To and from the master and calipers. Did you replace the calipers also? Lock ups usually occur when a brake hose is bad or the caliper is bad/binding. Drive it and check the wheel the gets the hottest. Short drive. They get really hot, be careful( will take the skin off your finger). You can get new, bad calipers. The booster and proportioning vavles will not cause a lock up.

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Pretty normal to not be able to lock the brakes without the assistance of the booster, it'll take a lot of pedal pressure without it. It's also normal for the pedal to feel harder without the booster, this goes for any car/truck with power brakes. Try it with any other car you have and you'll see.

I've worked on several old Cadis but don't recall what year they started using front disc. If it's been changed from drum to disc you'll likely need a different proportioning valve and possibly a different master to get them to work right. Talk to the seller and ask if the brake feel changed when they replaced the master and if they changed any other parts.

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There is no way that your proportioning valve is going to affect your engine idle. However, a leaking master cylinder and the resulting damaged diaphram in the vacuum brake booster will. Remove the master cylinder and look for brake fluid in the booster assembly. If there is fluid in there, replac both the master cylinder and the booster.

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1990 Honda accord brake problems


Short of jacking up the wheel and putting a new car underneath, you've just about covered all the possibilities. But I wonder, perhaps in your attempts to solve this, if you have inadvertantly introduced another fault? As you know, the brake master cylinder on a disc braked vehicle has no static valve. If there were to be a static valve in the master cylinder, the brakes would lock on after a few pumps. But this would affect both front wheels. There could also be a collapsed section in one of the flexible hoses which would let fluid through for bleeding but not allow the fluid to return. this would hold the brake on too. When you had the cliper off, did the rotor trun freely?

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Replaced the brake booster how do you adjust for


Possibly the Proportioning valve. its where the lines go after the master. it has a bleeder screw of some sort on it. The pins inside wear out and stick causing uneven pressure. Replace or rebuild it if that be the case. Also chect the master for fluid leaks at the end of the piston where it connects to the booster push rod. If its leaking rebuild or replace it. 

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Do you have a/the proportioning valve in your system? Pin needs to be pulled out for centering while bleeding.

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