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soft/low brake pedal

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by sxi ss, Sep 2, 2011.

  1. pete30nz

    pete30nz Member

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    I hardly used this vr v6 in the last year, and yes the brake pedal is still soft and spongy.
    I will eventually take it to midas here in Christchurch, NZ.
    See what they say after a abs bleed.
    Unless I can find a tech1 scan tool that does abs pulsing.

    Pete
     
  2. losh1971

    losh1971 Well-Known Member

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    Are you using a VT MC or VR? If you have twin piston calipers you need a bigger bore MC than the VR one as the smaller the bore the more pressure, hence excessive sponge.
     
  3. pete30nz

    pete30nz Member

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    Hi Losh1971,
    Just the standard VR setup.
     
  4. losh1971

    losh1971 Well-Known Member

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    no good, if you have twin calipers you need VT MC.
     
  5. losh1971

    losh1971 Well-Known Member

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    Stock VR brakes are spongy by nature as the MC bore is smaller than later models. Braided lines help with sponginess.
     
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  6. Wozza

    Wozza Well-Known Member

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    dirt road, slow speed and a huge STOMP will do the same thing :)
     
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  7. EYY

    EYY Well-Known Member

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    I've never had any trouble bleeding my brakes with the ABS. Done it on many commodores. Used to do it manually with a helper before I got my $25 vacuum bleeder off ebay.

    With shitty old hoses you can push the pedal to the floor with the car idling in most older commodores. Different story when driving though. If you pump the pedal when the cars not running a few times the pedal should become just about rock solid. If it does, the system is bled properly.
     
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  8. pete30nz

    pete30nz Member

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    It has travel which seems to be the warrant of fitness issue.
    It has new brake hoses on front only, not braided though.
     
  9. pete30nz

    pete30nz Member

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    Standard VR setup and standard VR calipers
     
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  10. pete30nz

    pete30nz Member

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    Hey people,
    Right yesterday I got a one man bleeder from super cheap, and 2 bottles on dot 3 fluid, and went round all brake calipers. With Car off and pedal feels good. I haven't road tested car yet, but will do tonight or tomorrow.
    Hopfully I have a better pedal than previously mentioned.

    New hoses on front a while ago, haven't done new hoses on the back yet.
    Photo of bleeder kit and rear hoses

    Fingers crossed,

    Cheers Pete
     

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    Last edited: Dec 29, 2018
  11. pete30nz

    pete30nz Member

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    Hey people

    Road tested car and pedal maybe a bit better.
    Mite have to wait to the new year and replace rear hoses.
    I'll be happy when I have a good high pedal. Even to borrow a scan tool to bleed the abs pump. I did get the abs to kick in when road testing it the other night, but no better pedal, and haven't rebled the brakes since.

    Pete
     
  12. losh1971

    losh1971 Well-Known Member

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    Braided hoses will stiffen up the pedal as long as there is no air in the lines anywhere.
     
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  13. stick3

    stick3 Active Member

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    i don t like the rusty bleed nipple are they all rusty and they should have a rubber cap on them to keep out dirt unscrew and check them to see if there not blocked with rust i would get new ones
     
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  14. pete30nz

    pete30nz Member

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    Hey people

    Update: new front trw discs on front, new rtc pads front and rear.
    Pedal was feeling a bit better after I also changed master to a spare one I had. Now the resivor where it sits on the master has a weep leak. I'll get that sealed up in the near future, and hopfully that will be leak free. Then rebleed brakes
     
  15. pete30nz

    pete30nz Member

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    Hi people,

    Yes still a soft brake pedal.
    I have an update.
    I was having a look under the bonnet and noticed 1 or 2 brake line connections to the abs pump were weeping. The chassis rail under the brake master and abs pump has quite a bit of brake fluid on it.
    I guess I'll take the lines off and get new flaring and new threaded ends put on to fix this?

    Cheers
    Pete
     
  16. vs-lover

    vs-lover Well-Known Member

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    Or just loosen them and remove, clean up and tighten then to see if you are getting any more weepage as it will show up rather quickly if there is some sort of leakage.
    A tiny amount of weepage won't give you a soft pedal whatsoever, now decent leakage will though.
     
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  17. pete30nz

    pete30nz Member

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    Good idea VS lover, I tightened up the brake lines and went over the judder bars and got the abs to kick in, and checked the lines again, and couldn't feel any weepage fluid.
    So ill check again and if no leaks bleed the brakes again
     
  18. pete30nz

    pete30nz Member

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    Hi people,

    I'm back to working on the blue VR abs brakes. The car is in better atmosphere and surroundings..
    I had found 2 lines going the the abs pump were weeping. They are now minimal to nothing weeping.
    Bleed the brakes, they are locking up and the abs pump is kicking in when being driven and jumping on the pedal which is good.
    I'm still wondering if I can better the firm less travel feel of the pedal by driving, braking and coming back to bleed the brakes over and over.

    As new discs and pads all around, new standard brake hoses in the front.

    Cheers Pete
     
  19. ephect

    ephect Donating Member

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    I wonder if the brake feel is normal but compared to other cars there is more travel.

    Have you driven other VR,VS cars to compare yours to?
     
  20. immortality

    immortality No more smoky bacon :( Staff Member

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    Brake pedal travel can be engine tune related. If the engine isn't running well than you won't get full vacuum and the brake booster needs good vacuum to work properly. If as suggested earlier the pedal is firm when the engine is off the hydraulic system is functioning correctly. If the pedal gets long with the engine running than the issue is booster/vacuum related.

    Doing some basic engine checks/maintenance might help.
     

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