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  1. #1
    Join Date
    Aug 2007
    Posts
    388

    Default Holding 100lb on front brakes

    Over the winter I put new seals in the calipers and added a bias gauge. And my fronts are holding 100lbs constant and zero rear with no pedal pressure. Bled the system manually and confident of no air. Balance bar even side to side and front to back. Even went as far as remove the pushrod and it's still at 100. Pressure on front is exactly 100 over rear no matter how hard you mash the pedal. Any suggestions?

  2. #2
    Join Date
    Jul 2014
    Posts
    455

    Default

    RF shutoff?

  3. #3
    Join Date
    Aug 2007
    Posts
    388

    Default

    Makes no difference if RF is off or on

  4. #4
    Join Date
    Jul 2014
    Posts
    455

    Default

    If you take line off back of gauge does it drop to 0

  5. #5
    Join Date
    Dec 2014
    Location
    pa
    Posts
    218

    Default

    I chased a issue with handling for two months because of a bad front master cylinder holding pressure as the race went on rear tires would just spin no drive in car caused by pushing half locked brakes

  6. #6
    Join Date
    Aug 2007
    Posts
    388

    Default

    I want to say that yes the gauge goes zero when unplugged but I will check again to be sure. What do I look for one way or the other.

  7. #7
    Join Date
    Jul 2014
    Posts
    455

    Default

    Could be a collapsed line, or a sticking caliper if you ask me

  8. #8
    Join Date
    Feb 2008
    Posts
    234

    Default

    What kind of gauge is it?
    Somewhat apples or oranges, but I had some fuel pressure issues, that turned out to be the gauge. If you pulled up on the line a bit, I could get up to 8 psi, push down, and it'd go to zero. It was frustrating, but after taking the friggen regulator off half a dozen times, and checking all the lines, tank, etc, it was nice to know it was an easy problem
    Here's my little home on Youtube!
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  9. #9
    Join Date
    Aug 2007
    Posts
    388

    Default

    Quickcar gauges

  10. #10
    Join Date
    Jun 2007
    Posts
    3,123

    Default

    Can you spin the front wheels at all with the car on jack stands? If you can, that's a bad gauge. If it isn't a bad gauge, I would be VERY careful removing the brake line anywhere that you truly believe there is that much pressure in it.

  11. #11
    Join Date
    Aug 2007
    Posts
    388

    Default

    Both fronts spin however not so freely as without a caliper..the right front has more drag than the left but has surface rust on the rotor so I would assume that is part of the not so free spin problem.

  12. #12
    Join Date
    Sep 2009
    Posts
    829

    Default

    100psi of brake fluid pressure would make the wheel very difficult to turn if not near impossible without a great deal of effort.

    Figure this out will be simple.
    Get in the car and push the brake peddle as hard as you can a few times. Get about 300/400 psi on the gauges.
    Get out of the car and see if the tires turn. If they do, then you have a gauge problem. If they don't, loosen the bleeder screw at the caliper on the offending wheel. If the wheel/tire now turns free, you have a brake line, caliper or master cylinder problem.

  13. #13
    Join Date
    May 2007
    Posts
    2,929

    Default

    Make sure the caliper is centered on the rotors.

    I found this to be a problem on alot of spindles, you usually need spacers. These calipers are 4 pistons, so both sides need room to float.

    Krom.

    Just say no...

  14. #14
    Join Date
    Feb 2008
    Location
    Illinois
    Posts
    3,734

    Default

    I had a problem similar way back. A new master cylinder wouldn't bleed back. The holes was in a wrong spot on a brand new one. A wrong length rod can do something similar. The piston has to come to a neutral position to bleed off pressure.

  15. #15

    Default brakes dragging

    I had this problem with my rear brakes once and it was because the balance bar in the brake pedal was bent.

  16. #16
    Join Date
    Jun 2007
    Posts
    3,123

    Default

    If there was really 100 psi on the caliper, you would not be able to turn the wheel at all unless you can bench about 300 pounds. So I think you have a bad gauge (not uncommon, those gauges are cheap).
    What you are describing sounds like normal brake drag. That goes away on the track.
    I will also agree with Krom...you need to have the calipers as close to center as possible. Some strange things happen when pistons on one side start to come out further than pistons on the other. They usually make the spindles so that you'll need washers to space them further inboard. If they tried to do it perfect and messed it up in the slightest, there would be no way of spacing it outboard short of bending the bracket.

  17. #17
    Join Date
    Aug 2007
    Posts
    388

    Default

    After reading the replies, I'm leaning toward bad gauge as well... I've got pads the pads centered with necessary shims spacing the caliper. I know the pedals are centered front to back & side to side because the pressure is dead on the same except the front is 100lb higher. And i still get 100 with the front push rod unhooked. gonna do just a little more investigation and most likely order a new gauge.

  18. #18
    Join Date
    Jun 2007
    Posts
    3,123

    Default

    Quote Originally Posted by 17m fan View Post
    After reading the replies, I'm leaning toward bad gauge as well... I've got pads the pads centered with necessary shims spacing the caliper. I know the pedals are centered front to back & side to side because the pressure is dead on the same except the front is 100lb higher. And i still get 100 with the front push rod unhooked. gonna do just a little more investigation and most likely order a new gauge.
    Just swap the front and rear gauges. Then you'll know for sure.

  19. #19
    Join Date
    Aug 2007
    Posts
    388

    Default

    Quote Originally Posted by Matt49 View Post
    Just swap the front and rear gauges. Then you'll know for sure.
    That be the plan

  20. #20
    Join Date
    Jun 2007
    Posts
    796

    Default

    Can you wiggle the balance bar? Make sure it isn't touching the firewall or a bar when pedal is at rest.

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