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09-02-2007, 06:42 PM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine:
Posts: 18
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Not Ranked
Yikes, no brakes!!!
I finally got my car complete and have been going over everything to get it ready for the state inspection. The brake pedal was very spongy, so I decided to bleed the brakes. I bled the old two person way and with a vacuum pump. The brakes were worse than ever, pedal goes straight to the floor and will only gain pressure with pumping. Decided to replace the MC today and I did bench bleed it before install. I then bled every wheel, rr, lr, fr, fl. Same thing, no change. Ideas???
Please help, I need to have this solved very soon to not miss my inspection date!!
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09-02-2007, 06:53 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
Are all your calipers installed so the bleed screws are on top?
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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09-02-2007, 06:56 PM
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Senior Club Cobra Member
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Join Date: Jan 2003
Location: Roseville,
CA
Cobra Make, Engine: 427 Unique Roadster, FE by FE Specialties, 470hp, Top Loader, 3:31 Jag
Posts: 1,716
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Not Ranked
I'm assuming from your post that you have one MC that supplies the front and rear brakes (is that accurate?). That being said, one should start the process with the brake cylinder or caliper furthest from the MC and work your way to the one closest. You didn't specify what type of brakes - some disc brake calipers have multiple bleed valves (i.e. Wilwood) you should use the ones on top for bleeding. This allows the caliper to fill completely.
__________________
Phil
CA SPCN 2004-040 complete and legal
http://www.uniquecobra.com/
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09-02-2007, 06:59 PM
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Join Date: Jun 2007
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Posts: 18
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The brakes are the standard set up from B&B. The calipers do have the bleeder on top. The MC has two reserviors, one small for the rear and a larger for the front. Any ideas?
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09-02-2007, 07:03 PM
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Club Cobra Member
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Join Date: Feb 2003
Location: Sterling,
IL
Cobra Make, Engine: SPF #1507 427 Dart Block Windsor
Posts: 1,192
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Not Ranked
Did you bleed the inside cylinders on the calipers?
Lowell
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09-02-2007, 07:10 PM
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Join Date: Jun 2007
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Lowell - I must not have because I don't understand what you mean? Please explain
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09-03-2007, 04:21 PM
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Any other ideas out there? I assume I have air somewhere.
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09-03-2007, 05:21 PM
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Senior Club Cobra Member
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Join Date: Jan 2003
Location: Roseville,
CA
Cobra Make, Engine: 427 Unique Roadster, FE by FE Specialties, 470hp, Top Loader, 3:31 Jag
Posts: 1,716
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Not Ranked
Sounds like you have air in the system somewhere. If you can't isolate the front & rear (and have a single MC) get yourself a pedal pumper (I use my wife) and go through the process of bleeding each cylinder/caliper insuring that the MC reservoir doesn't go empty.
__________________
Phil
CA SPCN 2004-040 complete and legal
http://www.uniquecobra.com/
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09-03-2007, 06:37 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,601
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Pgermond,I agree, the "old way" ,pumping the pedal never fails!
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09-03-2007, 06:41 PM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine:
Posts: 18
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Thanks guys, I guess I'll kep trying to bleed.
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09-03-2007, 06:55 PM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Glendale,
AZ.
Cobra Make, Engine: Cobray-C3, The 60's body lines on todays chassis technology
Posts: 2,302
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Check your balance bar for being centered first of all (you can do the front to rear bias with an adjustable bias valve). Then make sure you are allowing the M/C piston to completely return to home. For now leave a little extra free pedal movement. Too chase problems leave a good 3/4 inch of free play on the pedal to ensure each master cylinder is returning to the home stop.
If M/C does not have enough free play it has a internal passage that never closes and no pedal pressure can be built just like problem you have now. Then re- bleed the heck out of system. good luck, it will be fine!! Jeff C
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