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  1. #1
    Join Date
    Jan 2007
    Location
    CT
    Posts
    769
    Country Flag: United States

    Default Brake System Killing Me!

    I try to be self sufficient but this brake system is killing me. I just can't get them to feel confident. The car slows down but it should be throwing me into the windshield. The pedal with no vacuum feels pretty firm but during my test drive just not great.

    System
    DSE Brake Booster
    1" ACDelco 18M974 screw top master
    C6 Z06 6piston front 4piston rear
    3/16 Copper nickel brake lines

    Master was bench bleed and i used the motive power bleeder its bubble free but i feel like there could be some air left even though the calipers push solid fluid.

    DSE recommends a 7:1 pedal ratio which would put the rod on the upper hole vs lower hole. I've read that the lower hole is what you use for power. When i had it on the upper hole it would feel really soft. In the lower hole the brake is in line with the gas pedal (dse dbw) its notibly lower than stock.

    Do i continue to bleed this thing?
    Is the top hole right? - I hate questioning DSE.
    Should i bleed front brakes (rear port) first? Does it matter?

    I have a caliper pressure gauge on order to check the pressure. I'm going to try the old 2 man bleeding and getting the rear higher to move any air bubbles closer to the plunger.

    Any insight is appreciated


    Thanks Nick
    ________________
    Nick S.
    Gold/Gray 1967 Camaro

  2. #2
    Join Date
    Sep 2004
    Location
    Arizona
    Posts
    180

    Default

    Bleed, Bleed, Bleed, and then Bleed some more. You got air!

  3. #3
    Join Date
    Jan 2016
    Location
    Torrance, CA
    Posts
    38
    Country Flag: United States

    Default

    If your brake lines ever bend up, you could have air trapped in there. I had to re-run mine and had a bend over the trans tunnel that took forever to bleed. I also had a bad flare that looked fine but it was letting in a tiny bit of air as I bled it.

    I took the car to the local brake shop and they made quick work of bleeding with a fancy pump and fixing my leaky flare. Now my manual brakes work great!
    1966 Pontiac Tempest
    Two-door, no post. Fixing things one-by-one. Daily driven when it's not up on jackstands.
    UMI Stage 4 suspension. Manual Z06 brakes from Kore3. 275/40r18 and 275/40r19 rear. Currently building a Pontiac 400 stroker.

  4. #4
    Join Date
    Jan 2007
    Location
    CT
    Posts
    769
    Country Flag: United States

    Default

    I think I need to keep bleeding! I'm still uncertain on the brake hole location. dse says ideal 7:1 pedal ratio that means the top hole which is manual?
    ________________
    Nick S.
    Gold/Gray 1967 Camaro

  5. #5
    Join Date
    Aug 2007
    Posts
    194

    Default

    No expert but here's what has worked for me. Not running your brakes but I've used C5 brakes on a number of projects.

    Two systems.

    1.Power brake bleeder. Uses air pressure to push fluid from the master to the calipers. If you buy the kit the chain hold downs are junk. Use c-clamps. This will also push all the air out of the master. Careful if you have new paint it has a tendency to overfill the master and make a mess.
    2. Mity vac that pulls the fluid from the master. A bit slower but it works.

    Always start from the right rear, then left rear, then right front then left front.

  6. #6
    Join Date
    Sep 2010
    Location
    Beach Park IL
    Posts
    2,339
    Country Flag: United States

    Default

    The upper hole is 6:1 and only for manual brakes. I'm surprised you even able to hook it up there as there usually isn't enough swivel in the pushrod to get up that high without really binding up.

    Use the lower hole.

    You always bleed the port that is closest to the pedal, if that port is the front brake line, bleed that first.
    Donny

    Support your local hot rod shop!

  7. #7
    Join Date
    Jan 2007
    Location
    CT
    Posts
    769
    Country Flag: United States

    Default

    Thanks Don!

    ________________
    Nick S.
    Gold/Gray 1967 Camaro




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