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Thread: Rear Brakes Locking Up!

  1. #1
    SEi User import racer's Avatar
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    Question Rear Brakes Locking Up!

    So last week my rear brakes started locking up,not sure why.I replaced the caliper,rotor and pads a couple of months ago on the driver's side to pass inspection.Everything was fine after that,so don't know why they are locking up,think I need to clean them with brake fluid but to cold out to work on them.Anyone have an idea what's going on with them.



  2. #2
    3Geez Veteran lostforawhile's Avatar
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    Re: Rear Brakes Locking Up!

    your proportioning valve is going bad, it limits rear pressure to prevent the rears from locking before the front, it also has the residual pressure valves built into it. I doubt it's the master as the brakes are split diagonally, left front,right rear, etc, so a front and a back brake would be locking or dragging

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    Dr_Snooz's Avatar
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    Re: Rear Brakes Locking Up!

    Also do a visual inspection of the brakes themselves. Check for rust and wear, and re-grease all the sliding and pivot points as necessary. It's possible to have a backing plate go bad and do funky things with the rear brakes, so be aware of that too.
    Dr_Snooz

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    Re: Rear Brakes Locking Up!

    Would the pads cause a problem,the ones on the car were semi met and the one i changed were replaced with honda ones.

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    Re: Rear Brakes Locking Up!

    bump!

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    Re: Rear Brakes Locking Up!

    Seems like only one is locking up,the one i didn't replace.

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    Re: Rear Brakes Locking Up!

    If its only one I doubt it would be the prop valve. More likely the caliper or the rubber line to the caliper.

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    3Geez Veteran lostforawhile's Avatar
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    Re: Rear Brakes Locking Up!

    Quote Originally Posted by VIPER1988 View Post
    If its only one I doubt it would be the prop valve. More likely the caliper or the rubber line to the caliper.
    well there is a residual pressure valve for each rear brake built into the proportioning valve

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    Re: Rear Brakes Locking Up!

    Never said it wasn't a possibility. Just that caliper or hose are more likely. Especially if its the original 25 year old hoses. They collapse on the inside and hold the pressure in the caliper.

    Sent from my MB886 using Tapatalk

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    3Geez Veteran lostforawhile's Avatar
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    Re: Rear Brakes Locking Up!

    I would have gotten rid of those hoses years ago, not safe to trust a 25 year old brake hose

  11. #11
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    Re: Rear Brakes Locking Up!

    Agreed. These days you can find braided steel lines cheaper than regular rubber lines. I think I paid around 70$ for the whole set.

    Sent from my MB886 using Tapatalk

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    Re: Rear Brakes Locking Up!

    Quote Originally Posted by Dr_Snooz View Post
    Also do a visual inspection of the brakes themselves. Check for rust and wear, and re-grease all the sliding and pivot points as necessary. It's possible to have a backing plate go bad and do funky things with the rear brakes, so be aware of that too.
    This fool thinks you have rear drums. LOL

    I don't think your mismatched pads are helping things. The hydraulic system is designed to supply even pressure throughout. With one set of pads grabbing more aggressively than the other, expect one side to lock up sooner than the other. Pads are cheap so start there and work your way toward more expensive stuff.
    Dr_Snooz

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    Re: Rear Brakes Locking Up!

    Quote Originally Posted by Dr_Snooz View Post
    This fool thinks you have rear drums. LOL

    I don't think your mismatched pads are helping things. The hydraulic system is designed to supply even pressure throughout. With one set of pads grabbing more aggressively than the other, expect one side to lock up sooner than the other. Pads are cheap so start there and work your way toward more expensive stuff.
    I agree here, I would never replace brakes on one side of an axle without doing the same part on the other side, that's just asking for trouble.

    Otherwise I would look at the calipers and make sure they slide properly and the pistons are not seized or anything, then look at the proportioning valve.

  14. #14
    LX User Fixedit's Avatar
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    Re: Rear Brakes Locking Up!

    Did an SEi rear disc swap on my 86 LXi, new master cylinder, calipers, pads rotors etc., and installed the 4040 prop valve from the donor SEi.

    Left front caliper drags intermittently. Prop valve leaks out of the weep hole. Prop valve seems quite suspect. Grabbed a 3540 prop valve from a 3g prelude 2.0si, think Iíll be alright using that in place of the 4040?

  15. #15

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    Re: Rear Brakes Locking Up!

    Probably. I think that you would be fine with any prop valve that works, beggars can't be choosers

  16. #16

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    Re: Rear Brakes Locking Up!

    I don't think anyone could tell the difference except for that race car driver you hire to race your car on a track during the weekends.

    1988 Honda Accord LSDX-I

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