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Thread: Low fluid pressure

  1. #1
    LXi User
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    '85 lude
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    Low fluid pressure

    I have seen mention of proportioning valves 'going bad', but after 15 years of working on cars professionally I have never seen such a thing.

    I did a complete brake job on my car (88/9 LXi swap, new calipers, rotors, lines) and in bleeding the brakes the pressure is rather low. It should squirt a stream out but just dribbles. I have not yet changed the master, but their is no indication there is anything wrong with it and the slight diameter difference can't explain this.

    Is this scenario familiar to anyone else? The brakes feel good, but don't have the bite they should with what I assume should be more pressure. Oh, and the rear rotors I took off were rusty after an 1800 mile drive home. The pads were never really in them. It doesn't seem like the calipers/lines changed this much.



  2. #2
    2.0Si User
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    Knoxville TN
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    Re: Low fluid pressure

    Quote Originally Posted by night View Post
    I have seen mention of proportioning valves 'going bad', but after 15 years of working on cars professionally I have never seen such a thing.

    I did a complete brake job on my car (88/9 LXi swap, new calipers, rotors, lines) and in bleeding the brakes the pressure is rather low. It should squirt a stream out but just dribbles. I have not yet changed the master, but their is no indication there is anything wrong with it and the slight diameter difference can't explain this.

    Is this scenario familiar to anyone else? The brakes feel good, but don't have the bite they should with what I assume should be more pressure. Oh, and the rear rotors I took off were rusty after an 1800 mile drive home. The pads were never really in them. It doesn't seem like the calipers/lines changed this much.
    I dunno my old scout the prop valve was questionable I swaped it with a old used one with better results all thing being equal.

    Remember Hondas its cross proportional so one front to opposite rear. Possible one end I guess could effect the other. No or little pressure to BOTH rears is unusal?

    I would start with a new master bench bled and see what kinda pressure you actually have...I dunno what that would be maybe 1500 psi. Bypassing at the master would be very possible on low fluid pressure.

    When you went with new lines you went all new metal or just new flex hoses? Possible one bad not crimped correctly? I use a place in town that makes the stainless steel braid ones custom for about 15 years now with great results. I have used a new out of box rubber flex that must have been collapsed inside and would not return pressure just like an old worn one would.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

  3. #3

    Dr_Snooz's Avatar
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    Re: Low fluid pressure

    As far as I've seen, our prop valves fail by leaking.

    I will say that replacing my prop valve with the Wilwood adjustable absolutely transformed my braking for the better. Everything tightened up and the precision and control it added was almost unbelievable. Stuff just wears out after being in service long enough. Bear in mind that your braking system is 30 years old now. It's probably time to replace everything and completely rebuild the entire system, but at the least, it's worth doing a careful inspection of every component and replacing anything that looks suspect.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 220k miles, MT swap, rear disc swap

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  4. #4
    2.0Si User
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    Re: Low fluid pressure

    Snooze did you replumb it back to a Front/rear split?
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    My Acura Type R front brake thread

    https://www.3geez.com/forum/showthrea...r+brake+option

  5. #5

    Dr_Snooz's Avatar
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    Re: Low fluid pressure

    Yes I did. Front and Rear split. There wasn't any other way to plumb it as there are only three outlets on the valve. Two are marked Front and one is Rear and has to be split out at the back of the car (like all American cars). The adjustment knob does the rear outlet only so that would make it very interesting if you did it Honda's way. LOL
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 220k miles, MT swap, rear disc swap

    Can't see my car? Install the "photobucket embed fix" Add-On in your Firefox browser.

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